Shear-induced migration in colloidal suspensions
P. Marmet, A. Scacchi, and J. M. Brader
TL;DR
This study uses Brownian dynamics simulations to explore how colloidal particles migrate under shear flow, revealing that attractive interactions and particle size diversity influence migration and segregation.
Contribution
It systematically investigates shear-induced migration in colloids with various interactions and dispersities, highlighting the effects of attraction and particle size on migration behavior.
Findings
Attractive interparticle forces enhance migration.
Size segregation occurs in bidisperse and polydisperse systems.
Migration depends on shear rate and flow conditions.
Abstract
Using Brownian dynamics simulations we perform a systematic investigation of the shear-induced migration of colloidal particles subject to Poiseuille flow in both cylindrical and planar geometry. We find that adding an attractive component to the interparticle interaction enhances the migration effect, consistent with recent simulation studies of platelet suspensions. Monodisperse, bidisperse and polydisperse systems are studied over a range of shear rates, considering both steady states and the transient dynamics arising from the onset of flow. For bidisperse and polydisperse systems size segregation is observed.
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