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The interface between fluid-like and solid-like behaviour in two-dimensional granular flows

Published online by Cambridge University Press:  26 April 2006

Yi Zhang  and
Charles S. Campbell
Yi Zhang
Affiliation:
Department of Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453, USA
Charles S. Campbell
Affiliation:
Department of Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453, USA
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Abstract

The effective phase change from fluid behaviour to solid behaviour, that too often occurs in granular flow and brings with it such unwelcome events as funnel flows in hoppers and clogging of other material handling devices, is studied using a discrete particle computer simulation of a Couette flow with gravity. This simulation exhibits the full range of granular flow behaviour, from a stagnant solid-like material, through a quasi-static transition zone, to a rapid granular flow. The most important result is that the first movement in the material just above the static bed occurs in a quasi-static mode at a fixed value of the stress ratio τxy/τyy. Thus, it appears that the primary transition from solid to fluid behaviour is a yield-like phenomenon and can be described by a Mohr-Coulomb-type failure criterion.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 237 , April 1992 , pp. 541 - 568
Copyright
© 1992 Cambridge University Press

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