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Model for particle migration in bidisperse suspensions by use of effective temperature
H M Vollebregt1, R G M van der Sman, R M Boom
1Food and Biobased Research, Wageningen University & Research Centre, P.O. Box 17, 6700 AA Wageningen, The Netherlands. martijntje.vollebregt@wur.nl
Abstract:
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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