Fig 1.
Spiral grooved-wheel fertilizer applicator.
Fig 2.
Main structural dimensions and model of the spiral grooved-wheel.
Fig 3.
Dimensions of the fertilizer box.
Table 1.
Triaxial size, equivalent diameters, and sphericities of fertilizer granules.
Table 2.
The DEM parameters of the materials.
Table 3.
The DEM parameters of contacts between materials.
Fig 4.
(a) Experimental setup; (b) Screenshot of the fertilizer discharge process.
Fig 5.
Screenshots of simulation of the fertilizer discharge process.
Fig 6.
Measured fertilizer discharge mass rates of the two discharge devices at constant speed for the (a) compound and (b) urea fertilizer.
Fig 7.
Measured fertilizer particle falling velocity of the two discharge devices for the (a) compound and (b) urea fertilizer.
Fig 8.
Simulated discharge mass rates of the two discharge devices for the (a) compound and (b) urea fertilizer.
Fig 9.
Simulated fertilizer particle falling velocities of the two discharge devices for the (a) compound and (b) urea fertilizer.
Fig 10.
Simulated fertilizer discharge rates of the two discharge devices for the (a) compound and (b) Urea fertilizer.
Table 4.
Comparison of measured and simulated values of fertilizer discharge mass rate for the two discharge wheels.
Table 5.
Comparison of measured and simulated values of fertilizer falling velocity.