Model for particle migration in bidisperse suspensions by use of effective temperature

H. M. Vollebregt; R. G. M. van der Sman; R. M. Boom

doi:10.1039/C2FD20035J

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Faraday Discussions

Issue 1, 2012

Discussion summary and research papers, in physical chemistry, chemical physics and biophysical chemistry.

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Model for particle migration in bidisperse suspensions by use of effective temperature

H. M. Vollebregt,*^a R. G. M. van der Sman^a and R. M. Boom^b

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Food and Biobased Research, Wageningen University & Research Centre, 6700 AA Wageningen, The Netherlands
E-mail: martijntje.vollebregt@wur.nl

Food Process Engineering, Wageningen University, The Netherlands

Faraday Discuss., 2012,158, 89-103

DOI: 10.1039/C2FD20035J
Received 23 Feb 2012, Accepted 17 Apr 2012
First published online 20 Apr 2012

This article is part of themed collection: Soft Matter Approaches to Structured Foods

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A model for the particle migration in a bidisperse flowing suspension is proposed and compared to experimental data. A mixture formulation, describing the suspension velocity and pressure and the concentrations of two solid fractions is derived from a multi-fluid model. In the multi-fluid model the liquid phase and both dispersed phases are interpenetrating phases. The closure relations are based on a mean field approach extending closure relations of a monodisperse suspension. The model is used to predict segregation based on particle size in channel flow where the particles are subjected to Brownian motion and shear-induced migration. The comparison of the model results with experimental data shows that particle migration is predicted well by the given formulation.

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