Theory for size segregation in flowing granular mixtures based on computation of forces on a single large particle

We measure the upward force acting on a single, unconstrained, large particle in a granular medium of small particles flowing over inclined plane using discrete element method (DEM) simulation. Based on the computed force, we obtain an expression for the flux of large particles in a binary mixture of large and small particles and predict the equilibrium concentration profile and the velocity profile of the flowing layer. The theoretical predictions are in very good agreement with the DEM simulation results for a wide range of concentrations of large particles and inclination angles.

Automated summary

In this study, the upward force on a single large particle in a granular medium flowing over an inclined plane was measured using DEM simulation. The computed force was then used to predict the flux of large particles in a binary mixture and to determine the equilibrium concentration and velocity profiles of the flowing layer. The theoretical predictions showed very good agreement with the DEM simulation results across a wide range of concentrations and inclination angles.