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Phys. Rev. E 73, 041301 (2006) [6 pages]

Diffusion of a granular pulse in a rotating drum

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Nicolas Taberlet¹ and Patrick Richard²
¹DAMTP, University of Cambridge, Wilberforce Road, Cambridge, CB30WA, United Kingdom
²GMCM, Université Rennes 1, CNRS UMR 6626, Bâtiment 11A, 35042 Rennes, France

Received 25 November 2005; published 3 April 2006

Thediffusion of a pulse of small grains in an horizontalrotating drum is studied through discrete elements methods simulations. Wepresent a theoretical analysis of the diffusion process in aone-dimensional confined space in order to elucidate the effect ofthe confining end-plate of the drum. We then show thatthe diffusion is neither subdiffusive nor superdiffusive but normal. Thisis demonstrated by rescaling the concentration profiles obtained at variousstages and by studying the time evolution of the meansquared deviation. Finally we study the self-diffusion of both largeand small grains, and we show that it is normaland that the diffusion coefficient is independent of the grainsize.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevE.73.041301
DOI:	10.1103/PhysRevE.73.041301
PACS:	45.70.Ht; 47.27.N-; 83.50.-v 45.70.Ht Avalanches (granular systems) 47.27.N- Wall-bounded shear flow turbulence 83.50.-v Deformation and flow YEAR: 2006
KEYWORDS:	granular materials, self-diffusion, grain size

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