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 whith 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.
@article{arxiv.cond-mat/0103143,
title = {Rheology of a confined granular material},
author = {Guillaume Ovarlez and Evelyne Kolb and Eric Clément},
journal= {arXiv preprint arXiv:cond-mat/0103143},
year = {2016}
}