Particle dynamics in sheared granular matter
Abstract
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 δ 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 as a liquid with a local temperature δ V(y)2 and density dependent viscosity.
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