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The rheology of Brownian suspensions

Bossis, G. and Brady, J. F. (1989) The rheology of Brownian suspensions. Journal of Chemical Physics, 91 (3). pp. 1866-1874. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:BOSjcp89

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Abstract

The viscosity of a suspension of spherical Brownian particles is determined by Stokesian dynamics as a function of the Péclet number. Several new aspects concerning the theoretical derivation of the direct contribution of the Brownian motion to the bulk stress are given, along with the results obtained from a simulation of a monolayer. The simulations reproduce the experimental behavior generally observed in dense suspensions, and an explanation of this behavior is given by observing the evolution of the different contributions to the viscosity with shear rate. The shear thinning at low Péclet numbers is due to the disappearance of the direct Brownian contribution to the viscosity; the deformation of the equilibrium microstructure is, however, small. By contrast, at very high Péclet numbers the suspension shear thickens due to the formation of large clusters.


Item Type:Article
Additional Information:Copyright © 1989 American Institute of Physics (Received 15 September 1988; accepted 27 March 1989)
Subject Keywords:SUSPENSIONS; VISCOSITY; BROWNIAN MOVEMENT; SIMULATION; MONOLAYERS; MICROSTRUCTURE; DEFORMATION; PECLET NUMBER; STRESSES; LIQUID FLOW
Record Number:CaltechAUTHORS:BOSjcp89
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BOSjcp89
Alternative URL:http://dx.doi.org/10.1063/1.457091
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4586
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:29 Aug 2006
Last Modified:26 Dec 2012 09:00

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