Particle discharging from concentric and eccentric wedge shaped hoppers with different internal friction coefficients
hopper half angles and hopper widths was simulated by 3D discrete element method (DEM) and the effect of wall friction coefficient on discharging rate were investigated. In general
increasing wall friction coefficient would decrease discharging rate by retarding particle-wall slip
and the effect was more significant in wedge shaped hoppers. The friction coefficient in the convergent section had a stronger effect in reducing discharging rate than that in the vertical section. When internal friction coefficient decreased
or the width of the hopper increased
the retarding effect would decrease and eventually become insignificant.