Crucial role of side walls for granular surface flows: consequences for the rheology

Details Crucial role of side walls for granular surface flows: consequences for the rheology Crucial role of side walls for granular surface flows: consequences for the rheology

2005-03-17

arxiv.org/abs/cond-mat/0503425v2

Journal of Fluid Mechanics 541 (2005) 167-192

Physics

Condensed Matter

Soft Condensed Matter

25 pages, 17 figures, Accepted for publiction in J. Fluid Mech

Scientific paper

10.1017/S0022112005005987

In this paper we study the steady uniform flows that develop when granular material is released from a hopper on top of a static pile in a channel. We more specifically focus on the role of side walls by carrying out experiments in setup of different widths, from narrow channels 20 particle diameters wide to channels 600 particle diameters wide. Results show that steady flows on pile are entirely controlled by side wall effects. A theoretical model, taking into account the wall friction and based on a simple local constitutive law recently proposed for other granular flow configurations (GDR MiDi 2004), gives predictions in quantitative agreement with the measurements. This result gives new insights in our understanding of free surface granular flows and strongly supports the relevance of the constitutive law proposed.

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