Abstract:

Granular flow should be found in many natural phenomena and engineering application. An experimental system was installed with two cylinders to investigate the shear stress in granular flow; both of the two cylinders could rotate respectively; and a series of experiments have been carried out including the shear stress in granular flow with non-homogeneous solids; especially, the parameters, solid concentration, solid diameter and boundary conditions, were measured and analyzed. The experimental results show that the solid concentration and the diameter have important effects on the shear stress of granular flow; the differences between experimental results by Savage (inner cylinder rotation )and Bagnold (outer cylinder rotation ) are due to the boundary slip and rotation eccentricity. On the bases of above experiments, the characteristics of the shear stress have been studied further.

Key words: non-homogeneous solids, granular flow, shear stress