Revolving rivers in sandpiles: from continuous to intermittent flows

Details Revolving rivers in sandpiles: from continuous to intermittent flows Revolving rivers in sandpiles: from continuous to intermittent flows

2007-11-06

arxiv.org/abs/0711.0920v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 11 figures, submitted to Phys Rev E

Scientific paper

10.1103/PhysRevE.77.031305

In a previous paper [Phys. Rev. Lett. 91, 014501 (2003)], the mechanism of "revolving rivers" for sandpile formation is reported: as a steady stream of dry sand is poured onto a horizontal surface, a pile forms which has a river of sand on one side owing from the apex of the pile to the edge of the base. For small piles the river is steady, or continuous. For larger piles, it becomes intermittent. In this paper we establish experimentally the "dynamical phase diagram" of the continuous and intermittent regimes, and give further details of the piles topography, improving the previous kinematic model to describe it and shedding further light on the mechanisms of river formation. Based on experiments in Hele-Shaw cells, we also propose that a simple dimensionality reduction argument can explain the transition between the continuous and intermittent dynamics.

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