Some remarks on the rheology of dense granular flows |
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Authors: | J Rajchenbach |
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Institution: | (1) Laboratoire de Physique de la Matiére Condensée (CNRS-UMR 6622), Université de Nice Sophia-Antipolis, Parc Valrose, 06108 Nice Cedex, France |
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Abstract: | The paper reviews some peculiar properties exhibited by granular flows. We emphasize the inability of kinetic theory and of Bagnold s heuristic approach to describe the rapid regime of densely packed flows, characterized by the breakdown of the binary collision picture and by multibody long-lasting contacts. We suggest that deformation waves through the continuous paths of contacts can be effective to transport momentum and energy through the bulk, in a time very short compared to the inverse of the shear rate. This mechanism could explain some key rheological features encountered in dense granular materials.Received: 25 June 2004, Published online: 31 August 2004PACS:
45.70.-n Granular systemsJ. Rajchenbach: On leave from LMDH (CNRS-UMR 7603), Université P. et M. Curie, 75005 Paris, France. |
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