摘要
We perform DEM simulations to investigate the influence of the packing fraction γ on the,shape of mean tangential velocity profile in a 219 annular dense shear granular flow. There is a critical packing fraction γc. For γ 〈 γc, the mean tangential velocity profile shows a roughly exponential decay from the shearing boundary and is almost invariant to the imposed shear rate. However, for γ 〉 γc, the tangential velocity profile exhibits a rate-dependence feature and changes from linear to nonlinear gradually with the increasing shear rate. Furthermore, the distributions of normalized tangential velocities at different positions along radial direction exhibit the Gaussian or the composite Gaussian distributing features.
We perform DEM simulations to investigate the influence of the packing fraction γ on the,shape of mean tangential velocity profile in a 219 annular dense shear granular flow. There is a critical packing fraction γc. For γ 〈 γc, the mean tangential velocity profile shows a roughly exponential decay from the shearing boundary and is almost invariant to the imposed shear rate. However, for γ 〉 γc, the tangential velocity profile exhibits a rate-dependence feature and changes from linear to nonlinear gradually with the increasing shear rate. Furthermore, the distributions of normalized tangential velocities at different positions along radial direction exhibit the Gaussian or the composite Gaussian distributing features.
基金
Supported by the Key Project of the National Natural Science Foundation of China under Grant No 10532040, and the Programme of Changjiang Scholars and Innovative Research Team in University under Grant No IRT 0628.
