Surface granular flow, comprising granular material flowing on the surface of a heap of the
same material, occurs in several industrial and natural systems. The rheology of such a flow …

The rapid shearing of a mixture of cohesionless glass spheres and air or water was studied
in an annular, parallel-plate shear cell designed after Savage (1978). Two types of flow were …

The distribution of relative velocities between colliding particles in shear flows of inelastic
spheres is analysed in the volume fraction range 0.4–0.64. Particle interactions are …

The moving layer at the surface of a granular bed sheared by a viscous flow has been
investigated experimentally. The fluid and particle velocities have been measured using …

The hydrodynamics of the dense granular flow of rough inelastic particles down an inclined
plane is analysed using constitutive relations derived from kinetic theory. The basic …

A dominant aspect of granular flows is flow in thin surface layers. While an understanding of
the dynamics of dry granular surface flow has begun to emerge, the case of flow when air is …

Detailed understanding of flowing granular materials is severely hampered by the
deficiencies of present experimental methods. To help increase the information base, a …

Recent progresses in understanding the behavior of dense granular flows are presented.
After presenting a bulk rheology of granular materials, I focus on the new developments to …

A perturbation expansion of the Boltzmann equation is used to derive constitutive relations
for the granular flow of rough spheres in the limit where the energy dissipation in a collision …

The effect of a vertical gas flow on the dynamics of a coulombic granular material moving
over a horizontal rigid porous surface has been studied experimentally and theoretically …