Mixing and segregation of granular materials in chute flows
DSpace at IIT Bombay
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Title |
Mixing and segregation of granular materials in chute flows
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Creator |
KHAKHAR, DV
MCCARTHY, JJ OTTINO, JM |
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Subject |
2-dimensional rotating-drum
radial segregation thermal-diffusion multicomponent mixtures binary-mixtures elastic spheres inclined chute enskog theory model particles |
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Description |
Mixing of granular solids is invariably accompanied by segregation, however, the fundamentals of the process are not well understood. We analyze density and size segregation in a chute flow of cohesionless spherical particles by means of computations and theory based on the transport equations for a mixture of nearly elastic particles. Computations for elastic particles (Monte Carlo simulations), nearly elastic particles, and inelastic, frictional particles (particle dynamics simulations) are carried out. General expressions for the segregation fluxes due to pressure gradients and temperature gradients are derived. Simplified equations are obtained for the limiting cases of low volume fractions (ideal gas limit) and equal sized particles. Theoretical predictions of equilibrium number density profiles are in good agreement with computations for mixtures of equal sized particles with different density for all solids volume fractions, and for mixtures of different sized particles at low volume fractions (nu < 0.2), when the particles are elastic or nearly elastic. In the case of inelastic, frictional particles the theory gives reasonable predictions if an appropriate effective granular temperature is assumed. The relative importance of pressure diffusion and temperature diffusion for the cases considered is discussed. (C) 1999 [S1054-1500(99)01603-1].
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Publisher |
AMER INST PHYSICS
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Date |
2011-07-16T09:18:33Z
2011-12-26T12:49:41Z 2011-12-27T05:35:17Z 2011-07-16T09:18:33Z 2011-12-26T12:49:41Z 2011-12-27T05:35:17Z 1999 |
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Type |
Article
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Identifier |
CHAOS, 9(3), 594-610
1054-1500 http://dx.doi.org/10.1063/1.166433 http://dspace.library.iitb.ac.in/xmlui/handle/10054/4386 http://hdl.handle.net/10054/4386 |
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Language |
en
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