Ss. Hsiau et Hw. Jang, MEASUREMENTS OF VELOCITY FLUCTUATIONS OF GRANULAR-MATERIALS IN A SHEAR CELL, Experimental thermal and fluid science, 17(3), 1998, pp. 202-209
This paper studies the flow behavior of granular materials in a shear
cell. The average and fluctuating velocities in the streamwise and tra
nsverse directions were measured by the image processing technique and
particle tracking method. The granular materials were put in a shear
cell to simulate the Couette flow with a stationary upper wall. The fl
ows consist of a low shear region with higher and more uniform velocit
ies in the lower test section and of a high shear region in the upper
parr. The velocities were decreased with the height, and the fluctuati
ons, the granular temperature and the shear rate were increased with t
he height. The velocity fluctuations were anisotropic and were greater
in the streamwise direction. The influences of the lower wall velocit
y and the mean solid fraction on the flow behavior were investigated i
n this study. (C) 1998 Elsevier Science Inc. All rights reserved.