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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
 
Creator KHAKHAR, DV
MCCARTHY, JJ
OTTINO, JM
 
Subject 2-dimensional rotating-drum
radial segregation
thermal-diffusion
multicomponent mixtures
binary-mixtures
elastic spheres
inclined chute
enskog theory
model
particles
 
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].
 
Publisher AMER INST PHYSICS
 
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
 
Type Article
 
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
 
Language en