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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 399768
Title Suspension flow modelling in particle migration and microfiltration
Author(s) Vollebregt, H.M.; Sman, R.G.M. van der; Boom, R.M.
Source Soft Matter 6 (2010)24. - ISSN 1744-683X - p. 6052 - 6064.
Department(s) Food Process Engineering
FBR Food Technology
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) pressure-driven flow - shear-induced diffusion - concentrated colloidal dispersions - induced self-diffusion - fluidized-beds - hard-spheres - bidisperse suspensions - viscous resuspension - concentration polarization - spherical-particles
Abstract We review existing mixture models for shear-induced migration (SIM) in flowing viscous, concentrated particle suspensions via an analysis of the models from the perspective of a two-fluid formulation. Our analysis shows that particle suspensions in strong non-linear shear fields are a prime example of a driven soft matter system. The driving forces for particle migration can be expressed in terms of non-equilibrium osmotic pressure and chemical potential. Using the linear scaling of the effective temperature with the shear stress, we show that the osmotic pressure and shear-induced diffusion coefficients can be written in identical equations. This is similar to the equations for Brownian motion - with the temperature replaced by the effective temperature. As a guiding application we have taken crossflow microfiltration, where the driving is very strong and there is formation of a jammed state, cake layer, coexisting with the fluid state. The question whether the SIM mixture models holds for this application is investigated. Another questions is how SIM models can be extended for bidisperse suspensions, which is relevant for microfiltration applications involving particle fractionation. Analysis of existing closures of SIM mixture models from the two-fluid perspective learns us that the theory seems to be extendable towards bidisperse suspensions by means of the effective medium theory
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