The dynamics of fine powders in a rotating drum

Granular materials exhibit several regimes of behavior: plastic, inertial, fluidized, and entrained how but not all materials can pass through all these states. Our concern is with the criteria that determine the transition from one regime to another and with the boundaries to the various flow regimes that these criteria define. We have focused on fine, cohesive powders, where the interparticle cohesive force dominates over the gravitational force. The experiments to analyze this topic have been performed using a rotating drum device.