▪ Abstract Granular materials segregate. Small differences in either size or density lead to
flow-induced segregation, a complex phenomenon without parallel in fluids. Modeling of …

Rotating-drum flows span a variety of research areas, ranging from physics of granular
matter through hydrodynamics of suspensions to pure liquid coating flows. Recent years …

Granular materials are an integral part of our everyday life. They are also the base material
for most industrial processing techniques. The highly dissipative nature of the particle …

A continuum theory of partially fluidized granular flows is developed. The theory is based on
a combination of the equations for the flow velocity and shear stresses coupled with the …

Granular segregation in a rotating tumbler occurs due to differences in either particle size or
density, which are often varied individually while the other is held constant. Both cases …

Rotating drums are widely used in various processes such as mixing, coating and drying,
where particle segregation remains one of the major concerns. In the past, most of the …

An experimental study of the flow of different materials (steel balls, glass beads, and sand) in
quasi-two-dimensional rotating cylinders is carried out using flow visualization. The flow in …

Mixing in powders generally results from relative motion of groups of particles‒convective
mixing‒or of individuals‒diffusive mixing. Segregation or demixing occurs when the motion …

We model bidisperse size segregation of granular material in quasi-two-dimensional circular
tumbler flow using the advection–diffusion transport equation with an additional term to …

Mixing of granular solids is invariably accompanied by segregation, however, the
fundamentals of the process are not well understood. We analyze density and size …