Rheology of a confined granular material.
We study the rheology of a granular material slowly driven in a confined geometry. The motion is characterized by a steady sliding with a resistance force increasing with the driving velocity and the surrounding relative humidity. For lower driving velocities a transition to stick-slip motion occurs, exhibiting a blocking enhancement with decreasing velocity. We propose a model to explain this behavior pointing out the leading role of friction properties between the grains and the container's boundary.
Ovarlez
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G
Laboratoire des Milieux Désordonnés et Hétérogènes UMR7603, Université Pierre et Marie Curie, Boîte 86, 4, Place Jussieu, 75005 Paris, France.
Kolb
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E
Clément
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E