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Shear-induced self-diffusion in non-colloidal suspensions

Sierou, Asimina and Brady, John F. (2004) Shear-induced self-diffusion in non-colloidal suspensions. Journal of Fluid Mechanics, 506 . pp. 285-314. ISSN 0022-1120. http://resolver.caltech.edu/CaltechAUTHORS:SIEjfm04

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Abstract

Self-diffusion in a monodisperse suspension of non-Brownian particles in simple shear flow is studied using accelerated Stokesian dynamics (ASD) simulation. The availability of a much faster computational algorithm allows the study of large systems (typically of 1000 particles) and the extraction of accurate results for the complete shear-induced self-diffusivity tensor. The finite, and often large, autocorrelation time requires the mean-square displacements to be followed for very long times, which is now possible with ASD. The self-diffusivities compare favourably with the available experimental measurements when allowance is made for the finite strains sampled in the experiments. The relationship between the mean-square displacements and the diffusivities appearing in a Fokker–Planck equation when advection couples to diffusion is discussed.


Item Type:Article
Additional Information:"Reprinted with the permission of Cambridge University Press." Received 9 August 2001 and in revised form 17 November 2003) Published online 28 April 2004 This work was supported in part by grant NAG8-1661 from NASA and by a Dow graduate fellowship to A. S. Access to an Alpha-based Beowulf cluster at the California Institute of Technology was provided by the Center for Advanced Computing Research. Discussions with G. Subramanian regarding the Fokker–Planck analysis were very helpful.
Subject Keywords:DYNAMIC SIMULATION; DILUTE SUSPENSION; CONCENTRATED SUSPENSIONS; TRACER DIFFUSIVITIES; INDUCED PARTICLE; HARD-SPHERES; FLOW; MICROSTRUCTURE; BEHAVIOR; RHEOLOGY
Record Number:CaltechAUTHORS:SIEjfm04
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SIEjfm04
Alternative URL:http://dx.doi.org/10.1017/S0022112004008651
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1581
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:01 Feb 2006
Last Modified:26 Dec 2012 08:45

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