Numerical Simulations of Particle Motions at Continuous Rotational Speed Changes in Horizontal Rotating Drums

The motion of binary particles in three horizontal rotating drums with continuous rotational speed changes was studied based on the Discrete Element Method (DEM). Different simulation conditions were compared between two circular and an elliptical drum using same number physical properties for drums, at a series from 0.01 to 21.9 rad/s. By varying speed, four flow regimes produced simulation. Flow regimes, velocity vectors, normal forces, contacts 1 mm 3 comparatively analyzed, especially particle transient changing speeds. results showed that found different forces weakest cataracting regime; moreover, layers damaged when suddenly decreased direction changed top particles’ bed. maximum rolling regime, results. major axis smaller than minor largest among drums.