期刊
PHYSICAL REVIEW LETTERS
卷 85, 期 7, 页码 1428-1431出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.1428
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The particle dynamics and shear forces of granular matter in a Couette geometry are determined experimentally. The normalized tangential velocity V(y) declines strongly with distance y from the moving wall, independent of the shear rate and of the shear dynamics. Local rms velocity fluctuations delta V(y) scale with the local velocity gradient to the power 0.4 +/- 0.05. These results agree with a locally Newtonian, continuum model, where the granular medium is assumed to behave asa liquid with a local temperature [delta V(y)](2) and density dependent viscosity.
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