Abstract
The particle dynamics in an annular shear granular flow is studied using the discrete element method, and the influences of packing fraction, shear rate and friction coefficient are analyzed. We demonstrate the existence of a critical packing fraction exists in the shear granular flow. When the packing fraction is lower than this critical value, the mean tangential velocity profile exhibits a rate-independent feature. However, when the packing fraction exceeds this critical value, the tangential velocity profile becomes rate-dependent and varies gradually from linear to nonlinear with increasing shear rate. Furthermore, we find a continuous transition from the unjammed state to the jammed state in a shear granular flow as the packing fraction increases. In this transforming process, the force distribution varies distinctly and the contact force network also exhibits different features.
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The project was supported by the Key Project of the National Natural Science Foundation of China (10532040) and the Programme of Changjiang Scholars and Innovative Research Team in University (IRT 0628).
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Wang, D., Zhou, Y. Particle dynamics in dense shear granular flow. Acta Mech Sin 26, 91–100 (2010). https://doi.org/10.1007/s10409-009-0322-y
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DOI: https://doi.org/10.1007/s10409-009-0322-y