Initiation of granular surface flows in a narrow channel

Details Initiation of granular surface flows in a narrow channel Initiation of granular surface flows in a narrow channel

2007-07-17

arxiv.org/abs/0707.2466v1

Physics of Fluids 19 (2007) 088102

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 5 figures, to be published in Physics of Fluids

Scientific paper

10.1063/1.2753111

We experimentally investigate how a long granular pile confined in a narrow channel destabilizes when it is inclined above the angle of repose. A uniform flow then develops, which is localized at the free surface. It first accelerates before reaching a steady uniform regime. During this process, an apparent erosion is observed and the thickness of the flowing layer increases. We precisely study the evolution of the vertical velocity profile in this transient regime. The measurements are compared with the prediction of a visco-plastic model [P. Jop, Y. Forterre and O. Pouliquen, Nature 441, 727 (2006)]

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