Abstract
We present two simple experiments on granular flow. Though the notion of pile angle is common, it appears that there can be many different angles depending on the experiment [1, 2]. Our first experiment also shows, in a conical.geometry, that the dynamics of the flow leading to these angles depends strongly on the density of the pile and presumably on its internal structure, in contrast (surprisingly) to the final profile. Our second experiment studies the hysteresis between the static and dynamical angle in the case of a thin layer of beads on a rough inclined plane. Between these two angles, an avalanche is amplified while going down, and we observe that it grows lateraly leaving a triangular track, whose opening angle increases as the plane inclination approaches the static angle. Before reaching this limit, the avalanche starts to propagate upwards.
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References
Y. Grasselli and H. J. Herrmann, Physica A246, 301 (1997), and this book.
K. Wieghardt, in “Annual Review of Fluid Mechanics” 7, Van Dyke, Vincenti, We-hausen eds., pp. 89–114, ( Annual Reviews Inc., Palo Alto CA, 1975 )
J.-C. Dupla, Thèse de l’École Nationale des Ponts et Chaussées (1995).
C. Laroche, S. Douady, and S. Fauve, J. Phys. France 50, 699 (1989).
The rounded feet can thus be regarded as a boundary effect similar to capillarity. This interpretation should be checked with larger piles: the size of the angle transition should be independent of the pile size.
O. Pouliquen and N. Renaut, J. Phys. II France 6, 923 (1996).
The speed of this perturbation is larger than that of the grains themselves which are gradually left behind and eventually get trapped. There is a permanent mass exchange between the layer and the moving part, so that one should speak of a mixed mass/impulse propagation.
D. McClung, “Avalanche Handbook”, Seattle: Mountaineers (1993).
J. P. Bouchaud, M. Cates, J. R. Prakash, and S. F. Edwards, J. Phys. I France 4, 1383 (1994).
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© 1998 Springer Science+Business Media Dordrecht
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Douady, S., Daerr, A. (1998). Formation of Sandpiles, Avalanches on an Inclined Plane. In: Herrmann, H.J., Hovi, JP., Luding, S. (eds) Physics of Dry Granular Media. NATO ASI Series, vol 350. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2653-5_24
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DOI: https://doi.org/10.1007/978-94-017-2653-5_24
Publisher Name: Springer, Dordrecht
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