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2006.39: A theory for particle size segregation in shallow granular free-surface flows

2006.39: JMNT Gray and AR Thornton (2005) A theory for particle size segregation in shallow granular free-surface flows. Proceedings of the Royal Society A, 461. pp. 1447-1473. ISSN 1364-5021

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DOI: 10.1098/rspa.2004.1420


Granular materials composed of a mixture of grain sizes are notoriously prone to segregation during shaking or transport. In this paper, a binary mixture theory is used to formulate a model for kinetic sieving of large and small particles in thin, rapidly flowing avalanches, which occur in many industrial and geophysical free-surface flows. The model is based on a simple percolation idea, in which the small particles preferentially fall into underlying void space and lever large particles upwards. Exact steady-state solutions have been constructed for general steady uniform velocity fields, as well as time-dependent solutions for plug-flow, that exploit the decoupling of material columns in the avalanche. All the solutions indicate the development of concentration shocks, which are frequently observed in experiments. A shock-capturing numerical algorithm is formulated to solve general problems and is used to investigate segregation in flows with weak shear.

Item Type:Article
Subjects:MSC 2000 > 35 Partial differential equations
MSC 2000 > 70 Mechanics of particles and systems
MSC 2000 > 74 Mechanics of deformable solids
MSC 2000 > 86 Geophysics
MIMS number:2006.39
Deposited By:Prof JMNT Gray
Deposited On:24 March 2006

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