Table 9 Contact parameters for discrete element interactions.

From: CFD-DEM coupling analysis of EPB screw conveyor muck discharge in water-rich sandy cobble strata

Contact interface

Spoil-spoil

Cobble-cobble

Particle-conveyor

Coefficient of restitution

0.75

0.75

0.25

Static friction coefficient

0.20

0.80

0.70

Rolling friction coefficient

0.15

0.04

0.001

JKR surface energy (J/m2)

90

0

—

  1. Note: The JKR surface energy for the Particle-Conveyor interface is marked as "-" as the JKR model mainly characterizes interparticle cohesion (e.g., spoil-spoil, cobble-cobble). Cohesive effects between rigid conveyor and discrete particles are negligible, rendering this parameter unnecessary.
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