20191230354Experimental Investigation of Microchannel Heat Sink with Modified Hexagonal Fins22The concept of periodic renewal of boundary layers is a promising technique for the enhancement of heat transfer in microchannels. Extending the above concept, microchannel heatsink with modified hexagonal fins has been proposed for disrupting the flow periodically. An experimental study has been carried out to investigate the heat transfer and fluid flow characteristics of a microchannel heat sink with modified hexagonal fins and a conventional type of microchannels with plate fins. The heat transfer and fluid flow characteristics of the modified hexagonal fin microchannels have been compared with the plate fin microchannels. The heat transfer enhancement factor and pressure drop penalty factors are evaluated and compared. The modified hexagonal fin microchannel heat sink has been found to outperform the plate fin microchannel heat sinks in spite of the lesser heat transfer area. 647655S.SubramanianMicrowave Tube Research and Development Centre, BEL, Jalahalli, Bangalore, 560 013 IndiaMicrowave Tube Research and Development Centre, BEL, Jalahalli, Bangalore, 560 013 Indiapayssubramanian3669@gmail.comK. S.SridharPES Institute of Technology, 100 feet Ring Road, BSK III Stage, Bangalore, 560 085 IndiaPES Institute of Technology, 100 feet Ring Road, BSK III Stage, Bangalore, 560 085 Indiapayskssridhar@pes.eduC. K.UmeshUniversity Visvesvaraya College of Engineering, KR Circle, Bangalore, 560 001 IndiaUniversity Visvesvaraya College of Engineering, KR Circle, Bangalore, 560 001 Indiapaysumeshuvce@yahoo.co.inMicrochannel testing Modified hexagonal fins Single phase heat transfer Copper heat sinks Laminar flow.[Ansari, D., A. Hussain and A. Y. Kim (2010). Multiobjective optimization of a grooved micro-channel heat sink. IEEE Transactions on Components and Packaging Technology 33(4), 767-776.##
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]Assessment of Numerical Method by Experimental Data for Integrated Hypersonic Vehicles22This paper addresses the problem of rapid aerodynamic assessment and experimental verification of integrated hypersonic vehicles. Based on the adaptive Cartesian grid system, the aerodynamic performance of the air-breathing hypersonic vehicle is evaluated. Corresponding shrunken experimental model is investigated in FL-28 transient hypersonic wind tunnel. The grid-independent validation confirmes the proposed meshing method and optimal grid parameters. The convergent method is used for the aircraft model to calculate several flight conditions in cold state, and the calculated results are compared with the wind tunnel test data. The results show that in order to validate the accurate non-viscous dynamic characteristics of both internal and external flows, it is necessary to locally encrypt the grids of inner flow channel while ensuring the overall grid density of the aircraft. Although the computational time increases after grid encryption, the rapid prediction method of aerodynamic performance meets the requirements for engineering design. Compared with experimental results, there are several shockwave features invisible in the numerical results due to the simplification of solution procedure. The aerodynamic force coefficients obtained by the numerical method are verified by the experimental data and the same numerical method can be used in the conceptual design phase of aerodynamic shapes, which can greatly shorten the development cycle.657665X.WenCollege of Aeronautics and Astronautics, National University of Defense Technology, Changsha, 410073，ChinaCollege of Aeronautics and Astronautics, National University of Defense Technology, Changsha, 410073，Chinapaysxwentst@163.comJ.LiuCollege of Aeronautics and Astronautics, National University of Defense Technology, Changsha, 410073，ChinaCollege of Aeronautics and Astronautics, National University of Defense Technology, Changsha, 410073，Chinapaysliujun19711019@sina.comZ.LiuCollege of Aeronautics and Astronautics, National University of Defense Technology, Changsha, 410073，ChinaCollege of Aeronautics and Astronautics, National University of Defense Technology, Changsha, 410073，Chinapaysliuzhen_1213@126.comZ.XiaCollege of Aeronautics and Astronautics, National University of Defense Technology, Changsha, 410073，ChinaCollege of Aeronautics and Astronautics, National University of Defense Technology, Changsha, 410073，Chinapaysxiazhixun@sina.comL.JinCollege of Aeronautics and Astronautics, National University of Defense Technology, Changsha, 410073，ChinaCollege of Aeronautics and Astronautics, National University of Defense Technology, Changsha, 410073，Chinapaysjl.snowblade@gmail.comAerodynamic characteristics Internal and external flow integration Rapid simulation assessment Wind tunnel test.[Aftosmis, M. J., M. J. Berger and J. E. Melton (1997). Robust and efficient Cartesian mesh generation for component-based geometry. AIAA 1997-0196.##
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]Geometry and Motion Characteristics of Bubbles Released in Liquid Cross Flow22To investigate the characteristics of the bubbles trapped in liquid cross flow, air was injected into flowing water circulated in a closed loop. High speed photography was used to record bubble images instantaneously. An image-processing code was specifically developed to identify bubbles in the images and to calculate bubble parameters. Effects of the water velocity and the flow rate of the injected air on bubble patterns were investigated. The results indicate that the inclination of bubble trajectory relative to the nozzle axis is enhanced as the water velocity rises. Meanwhile, bubble size varies inversely with the water velocity. The bubble profile tends to be rounded as the water velocity increases. Fluctuations of the bubble velocity are intensified as the water velocity decreases. As the balance between the external forces exerted on the bubble is reached, an approximately linear relationship between the velocities of the bubble and the water is manifested. For a given equivalent bubble diameter, the bubble terminal velocity is higher than that associated with quiescent water. At small Eötvös number, the consistency of the bubble aspect ratio in the liquid flow and quiescent water is revealed. The range of Eötvös number is extended considerably due to the flowing water. Values of Weber number are accumulated in a range within which high bubble aspect ratio is associated with relatively high water velocity. 667677C.KangSchool of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, ChinaSchool of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, Chinapayskangcan@mail.ujs.edu.cnW.ZhangSchool of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, ChinaSchool of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, Chinapays865951565@qq.comY. G.JiSchool of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, ChinaSchool of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, Chinapaysjyy1994@qq.comY.CuiSchool of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, ChinaSchool of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, Chinapays616102425@qq.comBubble Liquid cross flow Air injection Bubble trajectory Bubble velocity Bubble size.[Balzán, M. A., R. S. Sanders and B. A. Fleck (2017). Bubble formation regimes during gas injection into a liquid cross flow in a conduit. The Canadian Journal of Chemical Engineering 95, 372–385.##
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]Modeling of Erosion Wear of Sand Water Slurry Flow through Pipe Bend using CFD22In the present study, erosion wear of a 90o pipe bend has been investigated using the Computational fluid dynamics code FLUENT. Solid particles were tracked to evaluate the erosion rate along with k-ɛ turbulent model for continuous/fluid phase flow field. Spherical shaped sand particles of size 183 µm and 277 µm of density 2631 kg/m3 are injected from the inlet surface at velocity ranging from 0.5 to 8 ms-1 at two different concentrations. By considering the interaction between solid-liquid, effect of velocity, particle size and concentration were studied. Erosion wear was increased exponential with velocity, particles size and concentrations. Predicted results with CFD have revealed well in agreement with experimental results. The magnitude and location of maximum erosion wear were more severe in bend rather than the straight pipe. 679687V.SinghThapar Institute of Engineering and Technology, Patiala, Punjab, 147004, IndiaThapar Institute of Engineering and Technology, Patiala, Punjab, 147004, Indiapaysvarinder8382@gmail.comS.KumarNational Institute of technology, Jamshedpur, IndiaNational Institute of technology, Jamshedpur, Indiapayssatish.kumar@thapar.eduS. K.MohapatraThapar Institute of Engineering and Technology, Patiala, Punjab, 147004, IndiaThapar Institute of Engineering and Technology, Patiala, Punjab, 147004, Indiapaysskmohapatra@thapar.eduComputational Fluid Dynamics (CFD) Erosion wear Discrete Phase Model (DPM) Pipe bend.[Ababaei, A., A. A. Arani and A. Aghaei (2017). Numerical Investigation of Forced Convection of Nanofluid Flow in Microchannels: Effect of Adding Micromixer. Journal of Applied Fluid Mechanics 10(6), 1759-1772.##
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Zhang, Y., E.P. Reuterfors, B.S. McLaury, S.A. Shirazi and E.F. Rybicki (2007). Comparison of computed and measured particle velocities and erosion in water and air flows. Wear 263 (1) 330–338.##]Effect of Reflux Hole on the Transient Flow Characteristics of the Self-Priming Sewage Centrifugal Pump22The reflux hole has a large effect on the performance of self-priming centrifugal pumps. In order to study the effects of the reflux hole on the performance and transient flow characteristics of the self-priming centrifugal pump, four different areas of the reflux hole inside an external mixed self-priming pump were proposed. The 3D transient flow was numerically simulated under different operating conditions for the investigated pump. The differential pressure, reflux quantity and transient flow characteristics near the reflux hole were analysed, and then the effects of the reflux hole area on the pressure fluctuation characteristics and performance of the pump were further researched. The results show that the differential pressure and reflux quantity is zero around the best-efficiency point. The vorticity magnitude near the exit of the reflux hole is significant, and the unsymmetrical flow structures represent periodic motion over time in the cross-section. The pressure fluctuation intensities of monitoring points P2-P5 upstream of the reflux hole were generally larger than others and decreased with a decrease in reflux hole area. With a decrease of the reflux hole area, the performance of the pump improved to some extent.689699P.ZhouCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, Chinapayspeijianzhou@gmail.comZ.WuCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, Chinapays1522850020@qq.comJ.MouCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, Chinapays1034355634@qq.comD.WuCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, Chinapays772642890@qq.comS.ZhengCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, Chinapayszxh_2233@126.comY.GuCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, ChinaCollege of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang, 310014, Chinapays1349449296@qq.comCentrifugal pump Reflux hole Transient flow characteristics Pressure fluctuation.[Chen, M. Q. (1990). The research and design in reflux hole of self-priming centrifugal pump. Journal of Fluid Engineering 1990(3), 10-15.##
Chen, M. Q. and W. D. WU (1998). The study on the influence of reflux hole of the self-priming centrifugal pump self-priming performance. Water Pump Technology 1998(1), 26-30.##
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ISO 9906:2012, Rotodynamic pumps - Hydraulic performance acceptance tests - Grades 1 and 2. International Standardization Organization, Geneva.##
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]Study of Flow Instability in a Miniature Centrifugal Pump Based on Energy Gradient Method22Flow instability in a miniature centrifugal pump is numerically simulated with the RANS equations and the SST k-ω turbulence model. The energy gradient method is adopted to analyze the flow instability at design load and two off-design loads, and the results are compared with those analyzed by Q-criterion. The regions with large magnitude of energy gradient function (K) indicate pronounced turbulent intensity and poor flow stability. Internal flow stability is investigated in details for both the near blade surfaces region and the impeller passages. To study the mechanism of energy gradient method, internal flow parameters such as the velocity and total pressure, the transverse gradient of total mechanical energy and the work done by shear stresses are investigated respectively. The results show that the energy dissipation reaches its maximum around the leading edge of suction surface. The value of the energy gradient function K presents a different magnitude for the near blade surfaces region and the impeller passages, and the K in the impeller passage is much larger. Regions with maximum of the work done by shear stresses are concentrated on the suction surface, regions with large transverse gradient of total mechanical energy is concentrated on the hub surfaces or shroud surfaces. It is further found that the K can reflect the influence of the outer boundaries of vortex on the flow near blade surface.701713K.LiFaculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University 1, Hangzhou, Zhejiang 310018, ChinaFaculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University 1, Hangzhou, Zhejiang 310018, Chinapayslikunhang0612@163.comX.ChenFaculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University 1, Hangzhou, Zhejiang 310018, ChinaFaculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University 1, Hangzhou, Zhejiang 310018, Chinapayschenxp075@163.comH. S.DouFaculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University 1, Hangzhou, Zhejiang 310018, ChinaFaculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University 1, Hangzhou, Zhejiang 310018, Chinapayshuashudou@yahoo.comZ.ZhuFaculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University 1, Hangzhou, Zhejiang 310018, ChinaFaculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University 1, Hangzhou, Zhejiang 310018, Chinapayszuczhu@163.comL.zhengFaculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University 1, Hangzhou, Zhejiang 310018, ChinaFaculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University 1, Hangzhou, Zhejiang 310018, Chinapayszhengll012@163.comX.LuoThermal Engineering Department, Tsinghua University 2, Beijing, 100084, ChinaThermal Engineering Department, Tsinghua University 2, Beijing, 100084, Chinapaysluoxw@tsinghua.edu.cnMiniature centrifugal pump Energy gradient method Flow instability Total mechanical energy.[Benturki, M., R. Dizene and A. Ghenaiet (2018). Multi-objective optimization of two-stage centrifugal pump using NSGA-II algorithm, Journal of Applied Fluid Mechanics 11(4), 929-943.##
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]Turbulent Energy Dissipation Rate and Turbulence Scales in the Blade Region of a Self-Aspirating Disk Impeller22Instantaneous radial and axial velocitieques of water in the tank with a self-aspirating disk impeller operating without gas dispersion were measured by the PIV method. A comparison of mean square velocity pulsations confirmed previous observations that the area in which turbulence is non-isotropic is small and extends about 3 mm above and under the impeller and radially 12,5 mm from the impeller blade tip. Based on velocity measurements, the distributions of energy dissipation rates were determined using the dimensional equation = C•u’3/D and Smagorinsky model. Adoption of the results of the dimensional equation as a reference value allowed us to determine the Smagorinsky constant value. This value appeared to be smaller than the values given in the literature. It has been shown that eddies in a small space near the impeller had sufficient energy to break up gas bubbles flowing out of the impeller. Based on the obtained energy dissipation rate distributions, appropriate turbulence scales were determined.715728J.StelmachLodz University of Technology, Faculty of Process and Environmental Engineering Wolczanska 213, 90Lodz University of Technology, Faculty of Process and Environmental Engineering Wolczanska 213, 90paysjacek.stelmach@p.lodz.plR.MusoskiLodz University of Technology, Faculty of Process and Environmental Engineering Wolczanska 213, 90-924 Lodz, PolandLodz University of Technology, Faculty of Process and Environmental Engineering Wolczanska 213, 90-924 Lodz, Polandpays161559@edu.p.lodz.plC.KuncewiczLodz University of Technology, Faculty of Process and Environmental Engineering Wolczanska 213, 90-924 Lodz, PolandLodz University of Technology, Faculty of Process and Environmental Engineering Wolczanska 213, 90-924 Lodz, Polandpaysczeslaw.kuncewicz@p.lodz.plM.GlogowskiLodz University of Technology, Faculty of Process and Environmental Engineering Wolczanska 213, 90-924 Lodz, PolandLodz University of Technology, Faculty of Process and Environmental Engineering Wolczanska 213, 90-924 Lodz, Polandpaysmichal.glogowski@p.lodz.plEnergy dissipation rate Turbulence scales Self-aspirating disk impeller.[Baldi, S. and M. Yianneskis (2003). On the direct measurement of turbulence energy dissipation in stirred vessels with PIV. Industrial Engineering and Chemical Research 42, 7006-7016.##
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]Experimental and Numerical Study of a Turbulent Multiple Jets Issued from Lobed Diffusers22A combined experimental and computational study of a turbulent multiple jet from lobed diffusers is performed. The main interest of these multiple lobed jets is to come up with the best configuration that improves the thermal and dynamic homogenization in air diffusion units that can be used for ventilation, heating and air conditioning of residential premises. Herein, the configuration of a central lobed jet surrounded by six equidistant peripheral lobed jets has been investigated. On the experimental level, flow velocities and temperatures were measured by a multifunctional thermo-anemometer. In terms of numerical simulation, the conservation equations of mass, momentum and energy are solved while involving four turbulence models, viz., the k-ϵ model, the k-ω, the shear stress transport (SST) k-ω model and the Reynolds Stress Model (RSM). The findings are compared with thermo-anemometer measurements. It turns out that the SST k- ω model is most appropriate for predicting the average flow characteristics.729742W.MedaouarControl, Testing, Measurement and Mechanical Simulation laboratory, University Hassiba Benbouali of Chlef, Hay Salem, National Road No. 19, 02000, AlgeriaControl, Testing, Measurement and Mechanical Simulation laboratory, University Hassiba Benbouali of Chlef, Hay Salem, National Road No. 19, 02000, Algeriapayswalidmedaouar@gmail.comL.LoukarfiControl, Testing, Measurement and Mechanical Simulation laboratory, University Hassiba Benbouali of Chlef, Hay Salem, National Road No. 19, 02000, AlgeriaControl, Testing, Measurement and Mechanical Simulation laboratory, University Hassiba Benbouali of Chlef, Hay Salem, National Road No. 19, 02000, Algeriapaysl.loukarfi@yahoo.frM.BraikiaControl, Testing, Measurement and Mechanical Simulation laboratory, University Hassiba Benbouali of Chlef, Hay Salem, National Road No. 19, 02000, AlgeriaControl, Testing, Measurement and Mechanical Simulation laboratory, University Hassiba Benbouali of Chlef, Hay Salem, National Road No. 19, 02000, Algeriapaysbraikia_m@yahoo.frA.KhelilControl, Testing, Measurement and Mechanical Simulation laboratory, University Hassiba Benbouali of Chlef, Hay Salem, National Road No. 19, 02000, AlgeriaControl, Testing, Measurement and Mechanical Simulation laboratory, University Hassiba Benbouali of Chlef, Hay Salem, National Road No. 19, 02000, Algeriapayskhelila@yahoo.frH.NajiUniversity of Artois, Civil Engineering & Geo-Environment Laboratory (LGCgE- EA 4515), Technoparc Futura, F-62400 Béthune, FranceUniversity of Artois, Civil Engineering & Geo-Environment Laboratory (LGCgE- EA 4515), Technoparc Futura, F-62400 Béthune, Francepayshassane.naji@univ-artois.frLobed jets Multiple jets Experimental study Numerical simulation Turbulence modelling RANS.[Anderson, E. A. and R. E Spall (2001). Experimental and numerical investigation of two-dimensional parallel jets. Transactions of the ASME 123(2), 401-406.##
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]An Investigation on the Effect of Blade Tip Clearance on the Performance of a Single-Stage Axial Compressor22In the present study, the numerical analysis of blade tip geometry effect on the performance of a single-stage axial compressor has been the focus of attention. The studied geometries included a rotor with variable tip clearance. For the first model, the tip clearance increases as it moves toward the blade trailing edge. The tip clearance of the second model reduces as it approaches the trailing edge, whereas in the third model, the tip clearance remains constant. The results indicated that the tip clearance of the first sample, as the worst tip clearance case, creates a 10% reduction in the stall margin with respect to the third standard model, and the second sample tip clearance brings about a stall margin reduction of 4% efficiency with respect to the third standard model. Then, the effect of blade tip clearance geometry on outlet flow angle of the rotor was inspected. The results showed that in the first model, the outlet flow angle has the largest deviation than the third standard model and the second model performance places somewhere between the two other tip clearance geometries. Also evident from the result is that taking advantage of the variable blade tip clearance is not an appropriate method for improving compressor performance. 743749M.OstadDepartment of Mechanical Engineering, Shiraz University, Shiraz, I. R. of IranDepartment of Mechanical Engineering, Shiraz University, Shiraz, I. R. of Iranpaysmasoodostad@yahoo.comR.KamaliDepartment of Mechanical Engineering, Shiraz University, Shiraz, I. R. of IranDepartment of Mechanical Engineering, Shiraz University, Shiraz, I. R. of Iranpaysrkamali@shirazu.ac.irAxial compressor Variable tip clearance Stall margin Flow angle Compressor performance.[Bae, J.W., K.S. Breuer and C.S. Tan (2003). Active control of tip clearance flow in axial compressors. ASME Turbo Expo, collocated with the 2003 International Joint Power Generation Conference 6, 531-542.##
Bianchi, S., A. Corsini, F. Rispoli and A.G. Sheard (2008). Experimental aeroacoustic studies on improved tip geometries for passive noise signature control in low-speed axial fan. ASME Turbo Expo: power for land, sea and air 6, 863-875.##
Corsini, A., B. Perugini, F. Rispoli, A.G. Sheard and I.R. Kinghorn (2006). Investigation on improved blade tip concept for axial flow fan. ASME Turbo Expo: power for land, sea and air 6, 313-325.##
Corsini, A., F. Rispoli and A.G. Sheard (2008). Shaping of tip end-plate to control leakage vortex swirl in axial flow, ASME Turbo Expo: power for land, sea and air 6, 571-580.##
Domercq, O. and J. F. Escuret (2007). Tip clearance effect on high-pressure compressor stage matching. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 221(6), 759–767.##
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Han, S. and J. Zhong (2011). The influences of pressure-side winglet on aerodynamic performance of compressor cascade at different incidences. International Conference on Consumer Electronics, Communications and Networks (CECNet), XianNing, China.##
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Kim, J. H., K. J. Choi and K. Y. Kim (2013). Aerodynamic analysis and optimization of a transonic axial compressor with casing grooves to improve operating stability, Aerospace Science and Technology 29(1), 81-91.##
Kroger, G., C. Voß, E. Nicke and C. Cornelius (2011). Theory and application of axisymmetric endwall contouring for compressors. ASME Turbo Expo: Turbine Technical Conference and Exposition 7, 125-137.##
Sitaram, N. and G. Ch. V. Sivakumar (2011). Effect of partial shrouds on the performance and flow field of a low-aspect-ratio axial-flow fan rotor. International Journal of Rotating Machinery.##
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]Influence of the Presence of the Lorentz Force and its Direction on the Suppression of Secondary Flow in Two Different Orifices: A Numerical Study using OpenFOAM22The present analysis emphasized the presence of Lorentz force and its directional effect on the fluid flow and its structure in the channel with two differently shaped orifices. The flow through orifice causes the generation of the bubbles or eddies in the downstream flow. In this study, the numerical code is developed in the open source CFD tool kit OpenFOAM. The magnetohydrodynamics (MHD) principle is adopted to achieve the present objectives. Direct numerical simulation (DNS) has been carried out to predict the flow features at fixed Reynolds number of Re = 1000 and blockage ratio of 1:4 with the varying magnetic field. The magnetic field is varied in term of Hartmann number (Ha) in the direction normal to the flow of fluid. The induced Lorentz force considerably occupies the wake flow area downstream of the throat and hence suppressed down the vortices in the flow. The results obtained has the promising effect of suppressing down the vortex flow past two different orifices produced by the electromagnetic pressure gradient. The present study shows the MHD based flow can be significantly employed for the flow past orifice or any arbitrary obstacle in order to achieve the flow without wake region. The current analysis suggests the method of vortex control by producing Lorentz force using magnetic field without modification of geometry or additional use of devices into the system.751762R. J.SinghDepartment of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India - 440010Department of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India - 440010paysiamranjitsingh@gmail.comT. B.GohilDepartment of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India - 440010Department of Mechanical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India - 440010paystrushar.gohil@gmail.comOpenFOAM Magnetohydrodynamics DNS Vortex control Pressure drop.[Abdulrazaq, A. A. Hasan, M. B. and H. A. Wael (2017). Investigation of flow through multi-stage restricting orifices, Ann. Nucl. Energy 104, 75-90.##
Altintas, A. and I. Ozkol (2015). Magnetohydrodynamic Flow of Liquid-Metal in Circular Pipes for Externally Heated and Non-Heated Cases, Journal of Applied Fluid Mechanic 8(3), 507-514.##
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Feng, J., Q.He, H. Chen, M. Ye (2016). Numerical Investigation of magnetohydrodynamic flow through sudden expansion pipes in Liquid Metal Blankets. Fusion. Eng. Des 109-111, 1360-1364.##
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]Numerical Study on the Effects of Fuel Injection Characteristics on the Performance of a Lean Burn SG-GDI Engine towards High Efficiency and Emissions Reduction22The effects of spark and injection characteristics as well as split injection on the performance and emissions of a spray-guided gasoline direct injection (SG-GDI) engine operating close to stoichiometric conditions are assessed. To accomplish this, a 6-holes injector is simulated and the results are validated against available experimental data for spray penetration length. In addition, an open-cycle multi-dimensional model is developed for a port fuel injection (PFI) engine and the model outcomes are verified against in-cylinder pressure profile and normalized heat release rate. The GDI engine model is yielded under the light of embedment of the above-mentioned models. The model is then employed for investigation of the effects of injector angle, injection pressure, start of first and second injections and two-stage fuel injection with different fuel mass ratios at first and second injections, i.e., split injection, on mixture formation, combustion and engine emissions. The results show the pivotal role of the injector angle on formation of the mixture and output power. On the other hand, it is indicated that while practicing the split injection strategy, the flammability of the relatively stratified lean mixture with fuel to air equivalence ratio of 1.15 around the spark plug, surpasses that of stratified mixture.763776S.SarmastMechanical Engineering Faculty, K. N. Toosi University of Technology, Tehran, 19991-43344, IranMechanical Engineering Faculty, K. N. Toosi University of Technology, Tehran, 19991-43344, Iranpaysssarmast@mail.kntu.ac.irM.ZiabasharhaghMechanical Engineering Faculty, K. N. Toosi University of Technology, Tehran, 19991-43344, IranMechanical Engineering Faculty, K. N. Toosi University of Technology, Tehran, 19991-43344, Iranpaysmzia@kntu.ac.irA.Salavati-ZadehNiroo Research Institute (NRI), Tehran, 14686-13113, IranNiroo Research Institute (NRI), Tehran, 14686-13113, Iranpaysalisalavati@ut.ac.irH. R.FajriIran Khodro Powertrain Co. (IPCO), Tehran, 13988-13711, IranIran Khodro Powertrain Co. (IPCO), Tehran, 13988-13711, Iranpaysh_fajri@ip-co.com1D and 3D CFD modeling Homogeneous and stratified charge Injection characteristics SG-GDI engine Split injection.[Alkidas, A. C. and S. H. E. Tahry (2003). Contributors to the fuel economy advantage of DISI engines over PFI engines. SAE Technical Paper 2003(01), 3101.
AVL FIRE User guide, version 2014, AVL List GmbH, 2015.##
Banerjee, R. and S. Kumar (2016). Numerical investigation of stratified air/fuel preparation in a GDI engine. Applied Thermal Engineering 104, 414-428.##
Boccardi, S., F. Catapano, M. Costa, P. Sementa, U. Sorge and B. Vaglieco (2016). Optimization of a GDI engine operation in the absence of knocking through numerical 1d and 3rd modeling. Advances in Engineering Software 95, 38-50.##
Bonatesta, F., E. Chiappetta and A. L. Rocca (2014). Part-load particulate matter from a GDI engine and the connection with combustion characteristics. Applied Energy 124, 366-376.##
Catapano, F., M. Costa, G. Marseglia, P. Sementa, U. Sorge and B. M. Vaglieco (2016b). An experimental and numerical investigation of gdi spray impact over walls at different temperatures. SAE Technical Paper 2016(01), 0853.##
Catapano, F., P. Sementa and B. M. Vaglieco (2016a). Air-fuel mixing and combustion behavior of gasoline-ethanol blends in a GDI wall-guided turbocharged multi-cylinder optical engine. Renewable Energy 96, 319-332. ##
Cathcart, G. and C. Zavier (2000). Fundamental characteristics of an air-assisted direct injection combustion system as applied to 4-stroke automotive gasoline engines. SAE Technical Paper 2000(01), 0256.##
Chen, L., Z. Liang, X. Zhang and S. Shuai (2017). Characterizing particulate matter emissions from GDI and PFI vehicles under transient and cold start conditions. Fuel 189, 131-140.##
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Costa, M., F. Catapano, P. Sementa, U. Sorge and B. Vaglieco (2016). Mixture preparation and combustion in a GDI engine under stoichiometric or lean charge: an experimental and numerical study on an optically accessible engine. Applied Energy 180, 86-103.##
Costa, M., U. Sorge and L. Allocca (2011). Numerical study of the mixture formation process in a four-stroke GDI engine for two-wheel applications. Simulation Modeling Practice and Theory 19 (4), 1212-1226.##
Costa, M., U. Sorge and L. Allocca (2012). CFD optimization for GDI spray model tuning and enhancement of engine performance. Advances in Engineering Software 49, 43-53.##
da Costa, R. B. R., C. A. Gomes, R. L. Franco, M. E. Guzzo and F. J. P. Pujatti (2015). E100 stratified lean combustion analysis in a wall-air guided type GDI optical engine. SAE Technical Paper 2015(36), 0269.##
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Drake, M. and D. Haworth (2007). Advanced gasoline engine development using optical diagnostics and numerical modeling. Proceedings of the Combustion Institute 31 (1), 99-124.##
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Wang, B., Y. Jiang, P. Hutchins, T. Badawy, H. Xu, X. Zhang, A. Rack and P. Tafforeau (2017b). Numerical analysis of deposit effect on nozzle flow and spray characteristics of GDI injectors. Applied Energy 204, 1215-1224.##
Wang, C., H. Xu, J. M. Herreros, J. Wang and R. Cracknell (2014). Impact of fuel and injection system on particle emissions from a GDI engine. Applied Energy 132, 178-191.##
Wang, L., J. A. Badra, W. L. Roberts and T. Fang (2017a). Characteristics of spray from a GDI fuel injector for naphtha and surrogate fuels. Fuel 190, 113-128.##
Wang, X., Y. Ge, L. Liu, Z. Peng, L. Hao, H. Yin, Y. Ding and J. Wang (2015). Evaluation on toxic reduction and fuel economy of a gasoline direct injection (gdi) powered passenger car fueled with methanol gasoline blends with various substitution ratios. Applied Energy 157, 134-143. ##
Xu, Z., J. Yi, E. W. Curtis and S. Wooldridge (2009). Applications of CFD modeling in GDI engine piston optimization. SAE SAE International Journal of Engines 2, 1749-1763.##
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Zhao An, Y., Y. qiang Pei, J. Qin, H. Zhao, S. ping Teng, B. Li and X. Li (2016). Development of a PAH (polycyclic aromatic hydrocarbon) formation model for gasoline surrogates and its application for GDI (gasoline direct injection) engine CFD (computational fluid dynamics) simulation. Energy 94, 367-379.##
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]Large-Eddy Simulation of a Laminar Separation Bubble22Large-eddy simulation of a laminar separation bubble on a flat plate has been performed and compared with the data in the literature. Suitability of different subgrid-scale models has been examined for simulation of transition. Comparison of various parameters and three-dimensional visualization of instantaneous flow fields indicate that standard Smagorinsky model, being too dissipative, is not suitable for this kind of problem and fails to properly resolve transition. With the application of low Reynolds number correction and a reduced model constant, a good agreement with the dynamic model is obtained at a lower computational cost. Of the three SGS models investigated, dynamic model gives the most physically accurate description of transition. The simulations illustrate that the appearance of Λ-vortices, vortex stretching and break down of longitudinal streaks characterize the transition process. Low values of reverse flow make it clear that a convective instability is involved. It is concluded that the initial amplification of disturbances is due to Tollmien -Schlichting mechanism while the roll-up of the shear layer takes place due to Kelvin-Helmholtz instability. It is observed that the universal log-law profile is not reached by the velocity profiles even far downstream.777788N. K.SinghDepartment of Mechanical Engineering, National Institute of Technology, Kurukshetra, Haryana, 136119, IndiaDepartment of Mechanical Engineering, National Institute of Technology, Kurukshetra, Haryana, 136119, Indiapaysnksinghfme@nitkkr.ac.inSeparation bubble Large-eddy simulation Smagorinsky model Dynamic model.[Alam, M. and N. D. Sandham (2000). Direct numerical simulation of ’short’ laminar separation bubbles with turbulent reattachment. Journal of Fluid Mechanics 403, 223–250.##
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]Steady Flow of Purely Viscous Shear-Thinning Fluids in a 1:3 Planar Gradual Expansion22Laminar flow of non-Newtonian fluid (shear-thinning) through a 1:3 planar gradual expansion is numerically investigated, for various Power-Law index (0.6, 0.8 and 1.0) and expansion angles (15, 30, 45, 60 and 90°) at different generalized Reynolds number (1 ≤ Reg ≤ 400). The study of these parameters effect on the flow pattern allowed the determination of the two critical generalized Reynolds numbers (Regcr1 and Regcr2), which correspond to the transition from the symmetric to the asymmetric flow and the appearance of the third recirculation zone respectively. The results showed that decreasing the Power-Law index or the expansion angle stabilizes the flow by increasing significantly the two critical generalized Reynolds numbers. In order to predict the two critical generalized Reynolds numbers, two correlations have been proposed.789801A.MenouerLaboratory of Industrial Technologies, Department of Mechanical Engineering, Ibn Khaldoun University, Tiaret, 14000, AlgeriaLaboratory of Industrial Technologies, Department of Mechanical Engineering, Ibn Khaldoun University, Tiaret, 14000, Algeriapaysabdelfettahmenouer@yahoo.frN. SadChemloulLaboratory of Industrial Technologies, Department of Mechanical Engineering, Ibn Khaldoun University, Tiaret, 14000, AlgeriaLaboratory of Industrial Technologies, Department of Mechanical Engineering, Ibn Khaldoun University, Tiaret, 14000, Algeriapayssad_2412@yahoo.frK.ChaibLaboratory of Industrial Technologies, Department of Mechanical Engineering, Ibn Khaldoun University, Tiaret, 14000, AlgeriaLaboratory of Industrial Technologies, Department of Mechanical Engineering, Ibn Khaldoun University, Tiaret, 14000, Algeriapayschaib_khaled@yahoo.frA.KadariLaboratory of Industrial Technologies, Department of Mechanical Engineering, Ibn Khaldoun University, Tiaret, 14000, AlgeriaLaboratory of Industrial Technologies, Department of Mechanical Engineering, Ibn Khaldoun University, Tiaret, 14000, Algeriapayskaduniv14@hotmail.frGradual expansion Bifurcation Shear-thinning fluid Critical Reynolds Number Recirculation[Battaglia, F., S. J. Tavener, A. K. Kulkarni and C. L. Merkle (1997). Bifurcation of low Reynolds number flows in symmetric channels. AIAA Journal 35(1), 99-105.##
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]Aerodynamic Analysis of a Three-Bladed Pivoted Savonius Wind Turbine: Wind Tunnel Testing and Numerical Simulation22In this study, a three-bladed pivoted vertical axis Savonius wind turbine is subjected to numerical and experimental studies. The experiments are carried out in a subsonic open-jet type wind tunnel, where the instantaneous position of the opening/closing blades are also determined via high speed imaging. The effects of adding end plates and the rotor aspect ratio on the turbine torque and power coefficients are investigated experimentally. Results show that adding end plates greatly enhances the rotor aerodynamic performance, in terms of both the maximum power coefficient and also the working range of the turbine. Similar effects are also observed for the effects of increasing the aspect ratio. Comparing numerical results with the experimental data demonstrated that the numerical results are in a convincing agreement with the experimental data of a wind rotor with an aspect ratio of 2.0 equipped with end plates. Although there are several two-dimensional numerical simulations for the drag-based vertical axis wind turbines in the literature, the results of the current study suggests that two-dimensional numerical results are not comparable with the experimental data of the rotors with small aspect ratios, especially without end plates.819829M.AmiriDepartment of Energy Engineering, Quchan University of Technology, Quchan, IranDepartment of Energy Engineering, Quchan University of Technology, Quchan, Iranpaysamiri.kh@qiet.ac.irM.KahromDepartment of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, IranDepartment of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iranpaysmkahrom@um.ac.irA. R.TeymourtashDepartment of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, IranDepartment of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iranpaysteymourtash@um.ac.irPivoted savonius Aspect ratio End plate Multiple reference frame Vertical axis. [Alexander, A. J. and B. P. Holownia (1978). Wind tunnel tests on a savonius rotor. Journal of Wind Engineering and Industrial Aerodynamics 3(4), 343-351.##
Altan, B. D. and M. Atılgan (2010). The use of a curtain design to increase the performance level of a Savonius wind rotors. Renewable Energy 35(4), 821-829.##
Amiri, M., A. R. Teymourtash and M. Kahrom (2016). Experimental and numerical investigations on the aerodynamic performance of a pivoted Savonius wind turbine. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 231(2): 87-101.##
Anbarsooz, M. (2016). Aerodynamic performance of helical Savonius wind rotors with 30° and 45° twist angles: Experimental and numerical studies. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 230(6), 523-534.##
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Chan, C. M., H. L. Bai and D. Q. He (2018). Blade shape optimization of the Savonius wind turbine using a genetic algorithm. Applied Energy 213, 148-157.##
D’Alessandro, V., S. Montelpare, R. Ricci and A. Secchiaroli (2010). Unsteady Aerodynamics of a Savonius wind rotor: a new computational approach for the simulation of energy performance. Energy 35(8), 3349-3363.##
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Pope, K., V. Rodrigues, R. Doyle, A. Tsopelas, R. Gravelsins, G. F. Naterer and E. Tsang (2010). Effects of stator vanes on power coefficients of a zephyr vertical axis wind turbine. Renewable Energy 35(5), 1043-1051.##
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Torresi, M., B. Fortunato, G. Pascazio and S. M. Camporeale (2011). CFD Analysis of a Savonius Rotor in a Confined Test Section and in Open Field. Volume 1: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Wind Turbine Technology.##
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]Numerical Study on the Effect of Temperature on Droplet Formation inside the Microfluidic Chip22The flow-focusing method is a technology for microfluidic droplet control, and the temperature can effect on the droplet formation. In this study, the droplet formation in the flow-focusing method during the squeezing of dispersed phase by the continuous phase is simulated using CLSVOF, with the consideration of the effects of temperature on droplet size, shape and frequency. The simulation results are consistent with experimental data. The simulated results demonstrate that the droplet size increases with the increase of inlet phase temperature, while the shape regularity and forming frequency decrease, the maximum increase of droplet size is 16%, the biggest drop of droplets number is 29%, and the biggest drop of the roughness parameter is 5%. When the inlet temperatures of the continuous phase are not equal, dripping and jetting are observed in the flow regime of droplet dispersed phase. The mechanism of the temperature influence on droplet formation and the detailed process of droplet formation under different flow regimes are discussed. At the same time, the radial size of droplet breakup point under different flow regimes is compared. The simulation results provide insights in better selection of the control parameters for droplet formation technology.831843F.JiangSchool of Mechanical and Electrical Engineering, Guangzhou University, ChinaSchool of Mechanical and Electrical Engineering, Guangzhou University, Chinapaysjiangfan2008@gzhu.edu.cnY.XuSchool of Mechanical and Electrical Engineering, Guangzhou University, ChinaSchool of Mechanical and Electrical Engineering, Guangzhou University, Chinapaysxuyongcheng@gzhu.edu.cnJ.SongJoining Technology Group, Singapore Institute of Manufacturing Technology, SingaporeJoining Technology Group, Singapore Institute of Manufacturing Technology, Singaporepayssongj@simtech.a-star.edu.sgH.LuSchool of Mechanical and Electrical Engineering, Guangzhou University, ChinaSchool of Mechanical and Electrical Engineering, Guangzhou University, Chinapayslhr578309013@qq.comNumerical simulation Droplet formation Flow focusing Temperature CLSVOF.[Abou-Hassan, A., O. Sandre and V. Cabuil (2010). Microfluidics in inorganic chemistry. Angewandte Chemie International Edition 49(36), 6268-6286.##
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]Effective Boundary Conditions and Numerical Method for Flow Characteristics of Aeroengine Compressor at High Mach Flight22Flow characteristics inside the compressor are of great importance for aeroengine performance under the high adverse pressure gradient. To meet the need for quick performance estimation, the numerical simulation is a meaningful investigation method to predict the similarity flow characteristics of aeroengine compressor at high Mach flight. Thus, this paper aims to satisfy the accuracy of compressor flow field at high altitude based on the similarity criterion. The accuracy for solution results by the application of the similarity criterion and the derivation of compressor boundary conditions is verified with the experimental data. Then, the parametric definitions of air intake are put forward to get the inlet boundary conditions of compressor. The comparative simulation results are conducted between similarity and prototype flow fields at design boundary conditions. The results show that among the most important dimensionless criterion is Mach number at high-speed flow, so the same equivalent mass flow and equivalent speed are recommended. In addition, the flow characteristics of the compressor at high altitude and high Mach number have a good similarity. Consequently, it can extend to further study compressor performance of aeroengine at different flight altitudes and Mach numbers. 845855A. Q.LinCollege of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, Heilongjiang Province, ChinaCollege of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, Heilongjiang Province, Chinapayslinaqiang493@sina.comJ.ZhouScience and Technology on Altitude Simulation Laboratory, jiangyou 621703, Sichuan Province, ChinaScience and Technology on Altitude Simulation Laboratory, jiangyou 621703, Sichuan Province, Chinapaysjiezhou_624@163.comX. J.TianAECC Sichuan Gas Turbine Establishment, jiangyou 621703, Sichuan Province, ChinaAECC Sichuan Gas Turbine Establishment, jiangyou 621703, Sichuan Province, Chinapays284675964@qq.comQ.ZhengCollege of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, Heilongjiang Province, ChinaCollege of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, Heilongjiang Province, Chinapayslamfjqz@163.comH.ZhangCollege of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, Heilongjiang Province, ChinaCollege of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, Heilongjiang Province, Chinapayszhanghai83821@163.comAeroengine compressor High Mach Similarity criterion Parametric definition.[Gao, Y. W. (2002). Experimental Fluid Dynamics. China Northwestern Polytechnical University Press, Xian, China.##
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Lin, A. Q., Q. Zheng, L. Yang and H. Zhang (2019). Effect of inlet air pre-cooling of water injection on compressor performance at high flight Mach. Journal of Applied Fluid Mechanics 12(2), 421–431.##
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]Investigation of Flow Field in Deep Dynamic Stall over an Oscillating NACA 0012 Airfoil22This paper presents the investigation on the phenomenon of a deep dynamic stall at the Reynolds number of the order of 105 over an oscillating NACA 0012 model. Wind tunnel experiments are conducted to investigate the aerodynamic characteristics of the upstroke and downstroke phase associated with the sinusoidal pitching motion of the airfoil using the technique of surface pressure measurements and Particle Image Velocimetry. The validation of the lift curve slope of upstroke and downstroke with the Prandtl’s thin airfoil theory reveals the fact of massive flow separation during the deep dynamic stall regime. Numerical simulations are performed using Reynolds averaged Navier Stokes turbulence models such as RNG K-є and SST models. The data obtained from these models have been compared with the experimental data to investigate the aerodynamic features of the deep dynamic stall regime. The comparison shows that the URANS with K-ε model is in good agreement with the experimental data within the reasonable regime. 857863D.Surekha R. S.Rajalakshmi Engineering College, Chennai, TamilNadu, IndiaRajalakshmi Engineering College, Chennai, TamilNadu, Indiapayssurekha.aero@gmail.comA.KhandelwalDepartment of Aerospace Engineering, IIT Kanpur, Kanpur, Uttar Pradesh, IndiaDepartment of Aerospace Engineering, IIT Kanpur, Kanpur, Uttar Pradesh, Indiapaysanshulk@iitk.ac.inR.RajasekarExcel Engineering College, TamilNadu, IndiaExcel Engineering College, TamilNadu, Indiapaysrajasekar080564@yahoo.comSinusoidal oscillation Unsteady flow Pitching airfoil Numerical simulation.[Akbari, M. H. and S. J. Price (2003). Simulation of dynamic stall for a NACA 0012 airfoil using a vortex method. Journal of Fluids and Structures 17, 855-874.##
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]Investigation on the Electrical Conductivity of Aqueous Glycol based ZnO Nanofluids22Nanotechnology research has proved sustainable results for a wide range of applications from engineering to medical science. Nanotechnology corresponds to the engineering of materials in nanosize (10-9m) whose material properties differ from of bulk properties. Nanofluid is one category of applications reported for its use as thermal management in cooling of electronic devices and fuel cell applications. In most literature, electrical conductivity studies were used as a basis to define the stability of nano-suspensions. In the present paper, the electrical conductivity studies of two glycol based nanofluids dispersed with ZnO nanoparticles of 50nm average diameter in the temperature range of 30-550C are reported. ZnO nanoparticles are added to the aqueous glycol base fluid prepared with (30 EG: 70 Water) and (30 PG: 70 Water) composition at a low volume concentration of 0.01 to 0.05%. Correlations are developed using experimental results for each volume concentration to predict electrical conductivity (EC) of nanofluids with temperature. From obtained results, the electrical conductivity of aqueous propylene glycol shows a decrement in EC after adding ZnO nanoparticles (except at 0.04% volume concentration) and vice versa for aqueous ethylene glycol. For aqueous propylene and ethylene glycol nanofluids, electrical conductivity enhancement up to 20% and 12% is obtained at a volume concentration of 0.04% and 0.01% at 550C temperature respectively. The electrical conductivity of both nanofluids increases with increase in temperature at all volume concentrations.865870L.ChilambarasanDepartment of Mechanical Engineering, SSN college of Engineering, Chennai, India-603110Department of Mechanical Engineering, SSN college of Engineering, Chennai, India-603110paysstr.chilambu@gmail.comR.PrakashDepartment of Mechanical Engineering, SSN college of Engineering, Chennai, India-603110Department of Mechanical Engineering, SSN college of Engineering, Chennai, India-603110paysprakashr@ssn.edu.inJ. P.ShanuInstitute of Energy Studies, Anna University, Chennai, India-600025Institute of Energy Studies, Anna University, Chennai, India-600025paysshanuhdz3@gmail.comP.MurugasenDepartment of Physics, Saveetha Engineering College, Chennai, India-602105Department of Physics, Saveetha Engineering College, Chennai, India-602105payspriyam7373@gmail.comElectrical conductivity ZnO-nanofluids Aqueous glycol Volume concentration Temperature Ion condensation effect.[Alina A. M. and R. S. Luciu (2012), Investigations on electrical conductivity of stabilized water based Al2O3 nanofluids. Microfluidics and Nanofluidics 13(6).##
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Zakaria, I., W. A. N. W. Mohamed, A. M. I. Bin Mamat and R. Saidur (2015). Experimental Investigation of Al2O3 - Water Ethylene Glycol Mixture Nanofluid Thermal Behaviour in a Single Cooling Plate for PEM Fuel Cell Application, Energy Procedia, 79, 252-258.##
Zawrah, M. F., R. M. Khattab, L. G. Girgis, H. El Daidamony, and R. E. Abdel Aziz (2015). Stability and electrical conductivity of water-base Al2O3 nanofluids for different applications, HBRC Journal , 12, 227–234.##
]Flow Field Influence Analysis of Combination Intake Port to Port and In-Cylinder for a Four-Valve Diesel Engine22Intake port structure directly affects the flow characteristics and combustion process of diesel engine, and then affects the comprehensive performance of diesel engine. To the intake ports of a four-valve direct injection diesel engine, the flow characteristics are analyzed on the four combined intake ports : (1) helical (left) and tangential (right), (2) tangential (left) and helical (right); (3) helical (left) and helical (right); and (4) tangential (left) and tangential (right).And the influence of air flow in four combined intake ports to in-cylinder gas flow is also analyzed. Results show that the helical and tangential combination intake ports flow velocity increases with the valve lift increases, and small turbulence arises at the valve guide lug, and the intake flow velocity of the minimum cross-section of the junction of the guiding section and the helical section is the maximum. The air flow in- cylinder moves from top cylinder head bottom to the cylinder bottom, the air flow is enlarged gradually by the small-scale irregular swirl, which eventually converges to a single swirl. The turbulence kinetic energy is very big when the air is just entering the cylinder, the flow space expands rapidly, and the dissipation of turbulent kinetic energy is very significant with the gas moves to the bottom of the cylinder.871881D. W.JiaYunnan Key Laboratory of Internal Combustion Engine, Kunming University of Science and Technology, Kunming 650500, ChinaYunnan Key Laboratory of Internal Combustion Engine, Kunming University of Science and Technology, Kunming 650500, Chinapays27546658@qq.comX. W.DengYunnan Key Laboratory of Internal Combustion Engine, Kunming University of Science and Technology, Kunming 650500, ChinaYunnan Key Laboratory of Internal Combustion Engine, Kunming University of Science and Technology, Kunming 650500, Chinapays664556969@qq.comY.WangYunnan Yuntong Judicial Expertise Center, Kunming 650224, ChinaYunnan Yuntong Judicial Expertise Center, Kunming 650224, Chinapays378960962@qq.comJ. L.LeiYunnan Key Laboratory of Internal Combustion Engine, Kunming University of Science and Technology, Kunming 650500, ChinaYunnan Key Laboratory of Internal Combustion Engine, Kunming University of Science and Technology, Kunming 650500, Chinapays22972489@qq.comFour-valve diesel engine Combined intake ports Air flow in intake ports Air flow in-cylinder.[Andreatta, É. C., F. A. A. Barbieri, L. L. F. Squaiella and R. Sassake (2008). Intake ports development: Euro IV diesel engine cylinder head SAE Paper 2008, 36-0331.##
Chunhui, W., L. Jilin, J. Dewen, B. Yuhua and S. Lizhong. (2014). A research on the intake flow and in-cylinder flow field in a four-valve DI diesel engine. Automotive Engineering 36 (1), 38-42.##
Cui, L., T. Wang, Z. Lu, M. Jia and Y. Sun (2015). Full-Parameter Approach for the Intake Port Design of a Four-Valve Direct-Injection Gasoline Engine. Journal of Engineering for Gas Turbines and Power 137(9), 091502.##
Deqing, M., W. Zhong and G. Zongying (2002). Experimental study of flow field in the cylinder of a 4-Valve D. I. diesel engine. Transactions of the Chinese Society of Agricultural 33(6), 23-25.##
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Tianyou, W., L. Daming, Sh. Jie, H. Yiyong, J. Chengji, Zh. Jie, G. Yu, L. Shuliang and J. Zejun (2008). Study of the flow characteristics of the inlet ports and in-cylinder of internal combustion engine. Journal of Engineering Thermophysics 29(4), 693-697.##
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Yuguo, G., Y. Zhenzhong, G. Shuman, Q. Chaoju, Ch. Wentao and Zh. Wei (2014). Influence of intake port on mixture formation in hydrogen engine. Chinese Internal Combustion Engine Engineering 35(3), 106-111.##]Numerical Investigation of Combustion Wave Propagation in Obstructed Channel of Pulse Detonation Engine using Kerosene and Butane Fuels22The present computational analysis reports the results of combustion phenomenon in 1200 mm long and 60 mm internal circular diameter (D) of three dimensional obstructed combustion chamber (combustor) of the pulse detonation engine (PDE). The simulation is carried out for stoichiometric mixture of two fuels Kerosene-air and Butane-air mixture at atmospheric pressure and temperature of 1 atm and 300 K respectively along with preheated air. The chemical species of Kerosene and Butane (C12H26 and C4H10) fuel are solved by species transport equation and irreversible one-step chemical kinetics model. The propagation speed of flame, detonation wave pressure and deflagration-to-detonation transition (DDT) run-up length are analyzed by three dimensional reactive Navier–Stokes algorithm along with realizable k-ɛ turbulence equation model. The obstacles are placed inside the combustor tube at spacing (s) of 60 mm (1D) and obstacles having blockage ratio (BR) 0.5 for creating perturbation in propagating combustion flame. This resulted in increase of the surface area of propagating flame and reduces deflagration-to-detonation transition (DDT) run-up length. 883890N.AlamDepartment of Mechanical Engineering, National Institute of Technology Silchar, Assam-788010, IndiaDepartment of Mechanical Engineering, National Institute of Technology Silchar, Assam-788010, Indiapaysnooralam2011@gmail.comK. M.PandeyDepartment of Mechanical Engineering, National Institute of Technology Silchar, Assam-788010, IndiaDepartment of Mechanical Engineering, National Institute of Technology Silchar, Assam-788010, Indiapayskmpandey2001@yahoo.comK. K.SharmaDepartment of Mechanical Engineering, National Institute of Technology Silchar, Assam-788010, IndiaDepartment of Mechanical Engineering, National Institute of Technology Silchar, Assam-788010, Indiapayskksharma1313@rediffmail.comObstacles Turbulent flame Detonation PDE.[Alam, N., K. K. Sharma and K. M. Pandey (2018). Numerical investigation of combustion phenomena in pulse detonation engine with different fuels, AIP Conference, Proceedings 1966, 020015 (2018). ##
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]Control of Laminar Separation Bubble using Vortex Generators22In this paper, the performance of sub boundary layer vortex generators and conventional vortex generators in controlling the separation bubble has been compared and the resultant highly three-dimensional flow has been studied. Two pairs of vortex generators mounted symmetrically along the spanwise direction are placed upstream of separation point to produce counter-rotating vortices. Effect of these three-dimensional vortex generators on the separation bubble and the flow downstream has been examined. The simulations show that the length of the separation bubble is reduced by sixty two per cent due to the deployment of vortex generators of height 0.33 δ while the original separation bubble is completely eliminated by the vortex generators of height 0.66 δ. However the presence of larger height vortex generators by itself causes a small mean separation bubble downstream. The flow downstream of vortex generators is highly three-dimensional and zones of recirculation can be observed between regions of attached flow. Presence of adverse pressure gradient results in greater interaction between counter-rotating vortices, leading to their early breakup and higher vortex decay rate compared to the zero pressure gradient case. Further, it is seen from the simulations that the counter-rotating array of vortices does not move away from the wall even far downstream.891905N. K.SinghDepartment of Mechanical Engineering, National Institute of Technology, Kurukshetra, Haryana, 136119, IndiaDepartment of Mechanical Engineering, National Institute of Technology, Kurukshetra, Haryana, 136119, Indiapaysnksinghfme@nitkkr.ac.inLaminar separation bubble Rectangular vortex generators Direct numerical simulation Immersed boundary method.[Alam, M. and N. D. Sandham (2000). Direct numerical simulation of ’short’ laminar separation bubbles with turbulent reattachment. Journal of Fluid Mechanics 403, 223–250.##
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]Dynamic Responses of Sliding Isolation Concrete Liquid Storage Tank under Far-Field Long-Period Earthquake22Under far-field long-period earthquake, liquid storage tanks are easy to be failure because of large amplitude liquid sloshing. In this paper, nonlinear contact is used to simulate behavior of sliding isolation bearing, nonlinear dynamic equation is used to solve fluid-structure interaction, bilinear material model is used to simulate limiting-device, and 3-D calculation model of sliding isolation concrete rectangular liquid storage tank (CRLST) with limiting-devices is established. Firstly, artificial far-field long-period earthquake waves are synthesized based on the existing seismic records. Secondly, dynamic responses of sliding isolation CRLST under the action of short-period and far-field long-period earthquakes are studied. Thirdly, effects of bi-directional earthquake and structure size on dynamic responses are investigated. Lastly, displacement control measures are discussed. Results show that far-field long-period earthquakes mainly affect horizontal displacement of structure and liquid sloshing wave height, and sliding isolation has obvious control effect on liquid sloshing wave height. Besides, horizontal displacement of structure and liquid sloshing wave height are increased with increase of seismic dimension and structure size. The reasonable designs of sliding isolation bearing and limiting-device can solve the problem that the maximum horizontal displacement of sliding isolation CRLST may exceed the limit under far-field long-period earthquake.907919W.JingKey Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, 730050, PR ChinaKey Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, 730050, PR Chinapaysjingwei3276@163.comX.ChengKey Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, 730050, PR ChinaKey Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, 730050, PR Chinapays1690733889@qq.comSliding isolation Concrete rectangular liquid storage tank (CRLST) Far-field long-period ground motion Fluid-structure interaction Liquid sloshing.[Calugaru, V. and S. A. Mahin (2009). Experimental and analytical studies of fixed base and seismically isolated liquid storage tanks. Proceedings of the 3rd International Conference on Advances in Experimental Structural Engineering, San Francisco, CA 16, 1-12.##
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]Analysis of the Gas Flow in a Labyrinth Seal of Variable Pitch22The paper discusses the results of investigations performed for the segments of straight-through labyrinth seals of constant length. Increasing the number of teeth of a segment resulted in a reduction of the pitch length to obtain the slot seals. The phenomena occurring during gas flow in labyrinth and slot seals differ significantly. They are described with different calculation models. The analysis presented in this paper is related to the change of the tightness and the nature of the flow from a straight-through labyrinth seal to a slot seal. The paper includes the results of experimental research and CFD calculations. Models applied for the Neumann and Scharer labyrinth seals as well as the model of the Salzman and Fravi slot seals were discussed. For the Neumann and Scharer models, correction coefficients for the tested geometry were proposed. Based on the assumptions for the said models and the obtained results, the phenomena responsible for the minimization of the leakage were discussed. The leakage rate in segments of different gap heights depending on the number of teeth and the pressure ratio upstream and downstream of the segment has been analyzed. Based on the experimental data, an optimum number of teeth in the segment for minimum leakage was determined. CFD calculations allowed determining the minimum leakage geometry. The experimental data contained in this paper confirm that the determined optimum pitch range is independent of the pressure drop.921930D.JoachimmiakChair of Thermal Engineering, Poznan University of Technology, Poznań, 60-965 Poznań, PolandChair of Thermal Engineering, Poznan University of Technology, Poznań, 60-965 Poznań, Polandpaysdamian.joachimiak@put.poznan.plP.KrzyslakChair of Thermal Engineering, Poznan University of Technology, Poznań, 60-965 Poznań, PolandChair of Thermal Engineering, Poznan University of Technology, Poznań, 60-965 Poznań, Polandpayspiotr.krzyslak@put.poznan.plSlot seal Flow machines Leakage CFD Optimization.[Anker, J., F. Jurgen and H. Stetter (2002). Computational Study of the Flow in an Axial Turbine with Emphasis on the Interaction of Labyrinth Seal Leakage Flow and Main Flow. In E. Krause et al. (Ed.), High Performance Computing in Science and Engineering 2001, Springer-Verlag Berlin Heidelberg.##
Asok, S. P., K. Sankaranarayanasamyb, T. Sundararajanc, K. Rajeshd and G. Sankar Ganeshan (2007). Neural network and CFD-based optimisation of square cavity and curved cavity static labyrinth seals. Tribology International 40, 1204–1216.##
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]Simulation of Film Boiling Heat Transfer in Complex Geometries using Front Tracking Method22Film boiling has various industrial applications especially in heat exchangers. Studying this phenomenon on complex geometries and investigating heat transfer coefficient is desired by many industries. The numerical method used here is a finite difference/front tracking method which is developed independently for film boiling in complex geometries. The film boiling over one, two or more cylinders is simulated using this method. The effect of dimensionless parameters namely Grashof and Jacob numbers are investigated for one cylinder. The effects of spacing, angle, and diameter are investigated for two cylinders. For the case with many cylinders, the effects of different geometrical configurations (regular and staggered) and number of rows are investigated by calculating the average Nusselt number on each cylinder. It is observed that the cylinder spacing does not have any significant effect on the Nusselt number for the upper cylinder. However the angle and cylinder diameter significantly affect the Nusselt number for the upper cylinder. In regular configuration, the Nusselt numbers for the upper cylinders are relatively uniform and higher than lower cylinders. In the staggered configuration, however, the Nusselt numbers of the upper cylinders are different, non-uniform, and higher than those of the regular arrangement.931946A.SedaghatkishDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, 8415683111, IranDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, 8415683111, Iranpaysa.sedaghat@me.iut.ac.irS.MortazaviDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, 8415683111, IranDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, 8415683111, Iranpayssaeedm@cc.iut.ac.irFilm boiling Front tracking method Complex geometries Heat transfer.[Adams, J. (1989). MUDPACK: multigrid FORTRAN software for the efficient solution of linear elliptic partial differential equations. Applied Mathematics and Computation 34, 113-146.##
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]A Computational Fluid Dynamics Investigation on the Drag Coefficient Measurement of an AUV in a Towing Tank22The accuracy of experimental procedure used to calculate the drag coefficient of an Autonomous underwater vehicle (AUV) in a towing tank is investigated using computational fluid dynamics. Effects of struts, used to connect the AUV model to towing carriage, on the hydrodynamics coefficient of the AUV at various relative submergence depths, at AUV speeds of 1.5 and 2.5 m/s are numerically simulated. Various numerical modeling are performed to investigate the effects of free surface with and without presence of struts on the drag coefficient of the AUV. Volume of fluid (VOF) model is used to solve the two phase flow RANS equations. The drag coefficients obtained from two phase flow simulations are compared with those obtained from single phase flow at corresponding velocities. The results obtained from experiments conducted in the towing tank of the Subsea Science and Technology centre, on a full-scale model of the AUV developed in this Centre, agreed well with those obtained by numerical simulations.947959E.JavanmardDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, IranDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iranpayse.javanmard@me.iut.ac.irSh.MansoorzadehSubsea Science & Technology Center, Isfahan University of Technology, Isfahan, IranSubsea Science & Technology Center, Isfahan University of Technology, Isfahan, Iranpaysshahriar@cc.iut.ac.irFree surface AUV Computational fluid dynamics VOF Towing tank Strut.[ANSYS (2009a), Ansys-cfx Solver Modeling Guide, Release 12.1, Ansys Inc., USA.##
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Zhang, X. G. and Z. J. Zou (2013). Estimation Of The hydrodynamic Coefficients From Captive Mode Test Results By Using Support Vector Machines. Ocean Engineering 73, 25–##]Electroosmotic Pressure-Driven Flow through a Slit Micro-Channel with Electric and Magnetic Transverse Field22In the present study, flow through two-dimensional microchannel under an axial electric field, transverse electric and magnetic fields and with axial pressure gradient has been investigated numerically. Continuity and momentum equations were solved steadily with respect to the non-slip condition by using discrete finite volume method and a numerical code. The results show that in the presence of the axial electric field, applying transverse magnetic field reduces flow velocity. However, when the transverse electric field and axial electric field exist together, applying the transverse magnetic field increases the flow rate to a certain extent and then reduces the flow rate. Hartmann number like this amount of magnetic field is known as critical Hartmann number. Therefore, with the presence of transverse and axial electric fields and transverse magnetic field, the highest possible flow rate is for critical Hartmann number. It was also found that by increasing the pressure gradient within the microchannel, the critical Hartmann number decreases. Moreover, by increasing the transverse electric field, the sensitivity of critical Hartmann number to the pressure gradient decreases and its value tends to a specific number (about 1.5).961969A.MoradmandDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, IranDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iranpaysabolfazlmoradmand1@gmail.comM.SaghafianDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, IranDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iranpayssaghafian@iut.ac.irB.Moghimi MofradDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, IranDepartment of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iranpaysb.moghimi@me.iut.ac.irMicrochannel Electro-osmotic flow Electro magneto hydro dynamic Transverse electrical field Critical hartmann number.[Al-Habahbeh, O., M. Al-Saqqa, M. Safi and T. A. Khater (2016). Review of magnetohydrodynamic pump applications. Alexandria Engineering Journal 55(2), 1347–1358.##
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]Convective Heat Transfer between Liquid Argon Flows and Heated Carbon Nanotube Arrays using Molecular Dynamics22This paper presents the molecular dynamics simulations of unconfined forced convective flow through the nanostructures at steady state condition. A better understanding of forced convective flow through the nanostructures is important because of its wide range of applications in nano-scale devices. Present work focuses on the heat transfer process of argon flow over a carbon nanotube and carbon nanotube arrays with constant surface temperature using molecular dynamics simulations. We consider two elementary configurations for the case of carbon nanotube arrays based on the unit cell structure. The simulation domain consists of fixed carbon nanotubes surrounded with the flowing argon atoms. An extensive study of momentum and thermal transport between carbon nanotube and surrounded argon atoms are analyzed from its microscopic state. The heat transfer coefficient is found in the order of 108 W/m2K. The method proposed in this paper can be an elementary step for the geometry calculation of nano-structured heat sink in the high heat flux electronic chips.971980T. M.ThomasDepartment of Mechanical Engineering, Indian Institute of Technology Gandhinagar, Palaj, Gujarat-382355, IndiaDepartment of Mechanical Engineering, Indian Institute of Technology Gandhinagar, Palaj, Gujarat-382355, Indiapaystibin.thomas@mtech2014.iitgn.ac.inN.VinodDepartment of Mechanical Engineering, Indian Institute of Technology Gandhinagar, Palaj, Gujarat-382355, IndiaDepartment of Mechanical Engineering, Indian Institute of Technology Gandhinagar, Palaj, Gujarat-382355, Indiapaysvinod@iitgn.ac.inCNT arrays Heat transfer Convection.[Alexiadis, A. and S. Kassinos (2008). Molecular simulation of water in carbon nanotubes. Chemical Reviews 108(12), 5014–5034.##
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]On Dispersion of a Reactive Solute in a Pulsatile Flow of a Two-Fluid Model22The present paper is a study on dispersion of reactive solute in an oscillatory flow of a two-fluid, three-layer Casson-Newtonian continuum using Aris-Barton’s approach. A two-fluid model of blood flow has been considered, the fluid in the central region is taken to be a Casson fluid (a core of red blood cell suspension) and a peripheral layer of plasma modelled as Newtonian fluid. The governing equations for the velocity distribution have been solved using a perturbation technique, and the effective dispersion coefficient has been evaluated numerically (FDM) by solving the moment equations. Using the Hermite polynomial representation of central moments the axial distribution of mean concentration is determined. The main objective is to look into the impact of yield stress, peripheral layer thickness, irreversible and reversible reaction rate on the dispersion process. The study has significant applications on the transport of species in a blood flow system.9871000S.DebnathDepartment of Mathematics, National Institute of Technology, Agartala, Tripura, 799046, IndiaDepartment of Mathematics, National Institute of Technology, Agartala, Tripura, 799046, Indiapayssudipdebnath49@gmail.comA. K.SahaDepartment of Mathematics, National Institute of Technology, Agartala, Tripura, 799046, IndiaDepartment of Mathematics, National Institute of Technology, Agartala, Tripura, 799046, Indiapaysapusaha_nita@yahoo.co.inP. G.SiddheshwarDepartment of Mathematics, Bangalore University, Bangalore, 560056, IndiaDepartment of Mathematics, Bangalore University, Bangalore, 560056, Indiapaysmathdrpgs@gmail.comA. K.RoyDepartment of Mathematics, National Institute of Technology, Agartala, Tripura, 799046, IndiaDepartment of Mathematics, National Institute of Technology, Agartala, Tripura, 799046, Indiapaysrk.ashis10@gmail.comAxial-dispersion coefficient Peripheral layer Casson fluid Reaction rate Two-fluid Three-layer.[Anderson, D., J. C. Tannehill, and R. H. Pletcher (1984). Computational fluid mechanics and heat transfer. Hemisphere Publishing Corporation, New York.##
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