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 2D 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 differentpositions along radial direction exhibit the Gaussian or the composite Gaussian distributing features.
Abstract：We perform DEM simulations to investigate the influence of the packing fraction γ on the shape of mean tangential velocity profile in a 2D 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 differentpositions along radial direction exhibit the Gaussian or the composite Gaussian distributing features.
WANG Deng-Ming;ZHOU You-He. Shear Profiles and Velocity Distribution in Dense Shear Granular Flow[J]. 中国物理快报, 2009, 26(2): 24501-024501.
WANG Deng-Ming, ZHOU You-He. Shear Profiles and Velocity Distribution in Dense Shear Granular Flow. Chin. Phys. Lett., 2009, 26(2): 24501-024501.
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