Analysis of radial segregation of granular mixtures in a rotating drum

Details Analysis of radial segregation of granular mixtures in a rotating drum Analysis of radial segregation of granular mixtures in a rotating drum

1999-06-09

arxiv.org/abs/cond-mat/9906125v1

Physics

Condensed Matter

Soft Condensed Matter

12 pages inclusive of 10 PostScript (*.eps) figures, uses svjour, psfrag and graphicx. Submitted for publication to Euro. Phys

Scientific paper

10.1007/s101890050028

This paper considers the segregation of a granular mixture in a rotating drum. Extending a recent kinematic model for grain transport on sandpile surfaces to the case of rotating drums, an analysis is presented for radial segregation in the rolling regime, where a thin layer is avalanching down while the rest of the material follows rigid body rotation. We argue that segregation is driven not just by differences in the angle of repose of the species, as has been assumed in earlier investigations, but also by differences in the size and surface properties of the grains. The cases of grains differing only in size (slightly or widely) and only in surface properties are considered, and the predictions are in qualitative agreement with observations. The model yields results inconsistent with the assumptions for more general cases, and we speculate on how this may be corrected.

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