| 国家重点基础研究发展规划 |
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| Velocity Fluctuation and Self-diffusion of Particles in a Dense Shear Granular Flow |
| WANG Deng-ming, ZHOU You-he |
| Key Laboratory of the Ministry of Education for Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, China |
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Abstract The dense granular flow is a very important state in granular materials movement. In such granular system, the velocity fluctuation of a single particle is the basis of many macroscopic processes such as transporting, mixing and segregating, etc. How to quantitatively characterize such fluctuating features becomes a very key issue in granular materials research. Based on the established discrete element model of annular shear granular flow, this paper mainly focuses on the macroscopic statistical features of particle velocity fluctuation within different sub-regions when the system approaches the shearing steady state. By introducing the self-diffusion coefficient, we investigate the localized and anisotropic features of diffusion processes of particles in a shear granular flow. Finally, the influences of local shear rate, initial packing fraction and friction coefficient between particles on self-diffusion coefficients in a shear granular flow are also discussed.
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Received: 01 December 2010
Published: 20 May 2011
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2011, Vol. 31 
