Volume 68, Number 4, November 2004
|Page(s)||515 - 521|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||13 October 2004|
The growth of a Super Stable Heap: An experimental and numerical study
Groupe Matériaux et Matière Condensée, Université Rennes 1 Bât. 11A, Campus Beaulieu, 35042 Rennes Cedex, France
Accepted: 15 September 2004
We report experimental and numerical results on the growth of a Super Stable Heap (SSH). Such a regime appears for flows in a thin channel and for high flow rate: the flow occurs atop a nearly static heap whose angle is stabilized by the flowing layer at its top and the side wall friction. The growth of the static heap is investigated in this paper. A theoretical analysis inspired by the BRCE formalism predicts the evolution of the growth process, which is confirmed by both experiments and numerical simulations. The model allows us to link the characteristic time of the growth to the exchange rate between the “moving” and “static” grains. We show that this rate is proportional to the height of the flowing layer even for thick flows. The study of upstream traveling waves sheds new light on the BCRE model.
PACS: 45.70.Ht – Avalanches / 45.70.Mg – Granular flow: mixing, segregation and stratification / 83.10.Mj – Rheology: Molecular dynamics, Brownian dynamics
© EDP Sciences, 2004
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