Table 1

Comparison of forces and velocities on grains of 1 mm diameter with a density of 1000 kg/m3.

Quantity Value Equation source Notes

ut 6.88 m/s Katra et al. Const. = 0.1. No cohesive forces. g = 1.15 × 10-4 m/s2
ut 335.64 m/s Shao and Lu γ = 3 × 10-4 and p = 30 nanobar.
Fg 8.12 × 10-11 N Simple gravity calculation.
FvdW 1.56 × 10-5 N Zoeteweij et al.
Fc 1.8 × 10-7 N Scheeres et al. S = 0.1
Fsl 5.8 × 10-9 N Shao and Lu Drag force corresponding to Shao and Lu ; CD = 4.

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