Europhys. Lett, 47 (3), pp. 324-330 (1999)
Sensitivity of granular surface flows to preparation
A. Daerr and S. Douady
Laboratoire de Physique Statistique de
24 rue Lhomond, 75231 Paris Cedex 05, France
(received 22 March 1999; accepted in final form 25 May 1999)
PACS. 47.50+d - Non-Newtonian fluid flows.
PACS. 83.50Lh - Interfacial and free surface flows; slip.
PACS. 45.05+x - General theory of classical mechanics of discrete systems.
The transient surface granular flow occurring when a cylindrical pile of granular media supported by a disc crumbles to form a cone is investigated. The experiments show that this flow depends strongly on the way the granular material was prepared. We found a clear dependence on the density of the packing, leading from a deep bulk flow for low densities to an erosive surface flow for high ones. But the flow is also sensitive to possible asymmetries of the internal structure of the material.
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