Uphill solitary waves in granular flows

Details Uphill solitary waves in granular flows Uphill solitary waves in granular flows

2006-01-31

arxiv.org/abs/cond-mat/0601685v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

We have experimentally observed a new phenomenon in the surface flow of a granular material. A heap is constructed by injecting sand between two vertical glass plates separated by a distance much larger than the average grain size, with an open boundary. As the heap reaches the open boundary, "soliton-like" fluctuations appear on the flowing layer, and move "up the hill" (i.e., against the direction of the flow). We explain the phenomenon in the context of stop-and-go traffic models, and show that soliton-like behavior is allowed within a Saint-Venant description for the granular flow.

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