ABSTRACT
When mixtures of different types or sizes of sand or beads are rotated in a cylindrical drum, two different kinds of segregation have been observed: first, the smaller particles tend to segregate radially forming a radial core near the radial center of the drum; after that, the particles separate into bands along the axis of the drum. Since variants of rotating drums are a common method of mixing in industry, these phenomena have practical applications as well as giving insights into the basic mechanisms underlying granular flows.
