Diffusion of a granular pulse in a rotating drum
arXiv:cond-mat/0603840 · doi:10.1103/PhysRevE.73.041301
Abstract
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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- Self-Diffusion Scalings in Dense Granular Flows
- The mechanism of long-term coarsening of granular mixtures in rotating drums
- Self-diffusion in inhomogeneous granular shearing flows