Transverse Instability of Avalanches in Granular Flows down Incline

Details Transverse Instability of Avalanches in Granular Flows down Incline Transverse Instability of Avalanches in Granular Flows down Incline

2005-10-04

arxiv.org/abs/cond-mat/0510081v1

Physics

Condensed Matter

Soft Condensed Matter

3 figures, 4 pages, submitted to Phys Rev Lett

Scientific paper

10.1103/PhysRevE.73.050302

Avalanche experiments on an erodible substrate are treated in the framework of ``partial fluidization'' model of dense granular flows. The model identifies a family of propagating soliton-like avalanches with shape and velocity controlled by the inclination angle and the depth of substrate. At high inclination angles the solitons display a transverse instability, followed by coarsening and fingering similar to recent experimental observation. A primary cause for the transverse instability is directly related to the dependence of soliton velocity on the granular mass trapped in the avalanche.

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