title: Rheology of a confined granular material.
abstract: 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.
authors.affiliation: Laboratoire des Milieux Désordonnés et Hétérogènes UMR7603, Université Pierre et Marie Curie, Boîte 86, 4, Place Jussieu, 75005 Paris, France.
authors.forename: G
authors.initials: G
authors.lastname: Ovarlez
authors.forename: E
authors.initials: E
authors.lastname: Kolb
authors.forename: E
authors.initials: E
authors.lastname: Clément