Diffusion of a granular pulse in a rotating drum

Details Diffusion of a granular pulse in a rotating drum Diffusion of a granular pulse in a rotating drum

2006-03-31

arxiv.org/abs/cond-mat/0603840v1

Physical Review E 73 (2006) 041301

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevE.73.041301

The diffusion of a pulse of small grains in an horizontal rotating drum is studied through discrete elements methods simulations. We present a theoretical analysis of the diffusion process in a one-dimensional confined space in order to elucidate the effect of the confining end-plate of the drum. We then show that the diffusion is neither subdiffusive nor superdiffusive but normal. This is demonstrated by rescaling the concentration profiles obtained at various stages and by studying the time evolution of the mean squared deviation. Finally we study the self-diffusion of both large and small grains and we show that it is normal and that the diffusion coefficient is independent of the grain size.

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