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Humidity Effects and Aging Behavior in Granular Media

Published online by Cambridge University Press:  10 February 2011

F. Restagno
Affiliation:
Laboratoire de Physique, École Normale Supérieure de Lyon, F-69364 Lyon Cedex 07, frestagn @physique.ens-lyon.fr
H. Gayvallet
Affiliation:
Laboratoire de Physique, École Normale Supérieure de Lyon, F-69364 Lyon Cedex 07, frestagn @physique.ens-lyon.fr
L. Bocquet
Affiliation:
Laboratoire de Physique, École Normale Supérieure de Lyon, F-69364 Lyon Cedex 07, frestagn @physique.ens-lyon.fr
E. Charlaix
Affiliation:
Dé partement de Physique des Matériaux, Université Lyon I, 63 boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex
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Abstract

We present a study of humidity effects on the maximum stability angle in granular media. We show that a granular medium of small glass beads exhibits aging properties: the first avalanche angle increases logarithmically with the resting time of the pile. This aging behavior is found to depend on the relative humidity of the surrounding atmosphere. A short interpretation of this effect, based on a model of activated capillary condensation, is proposed.

Type
Research Article
Copyright
Copyright © Materials Research Society 1999

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