期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.058001
关键词
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资金
- National Science Foundation [CBET-1253228]
- MIT Department of Mechanical Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1253228] Funding Source: National Science Foundation
A recent granular rheology based on an implicit granular fluidity field has been shown to quantitatively predict many nonlocal phenomena. However, the physical nature of the field has not been identified. Here, the granular fluidity is found to be a kinematic variable given by the velocity fluctuation and packing fraction. This is verified with many discrete element simulations, which show that the operational fluidity definition, solutions of the fluidity model, and the proposed microscopic formula all agree. Kinetic theoretical and Eyring-like explanations shed insight into the obtained form.
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