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Flow-induced segregation in confined multicomponent suspensions: effects of particle size and rigidity

Published online by Cambridge University Press:  13 December 2013

Amit Kumar ,
Rafael G. Henríquez Rivera  and
Michael D. Graham
Amit Kumar
Affiliation:
Department of Chemical and Biological Engineering, University of Wisconsin–Madison, Madison, WI 53706, USA
Rafael G. Henríquez Rivera
Affiliation:
Department of Chemical and Biological Engineering, University of Wisconsin–Madison, Madison, WI 53706, USA
Michael D. Graham*
Affiliation:
Department of Chemical and Biological Engineering, University of Wisconsin–Madison, Madison, WI 53706, USA
*
†Email address for correspondence: graham@engr.wisc.edu
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Abstract

The effects of particle size and rigidity on segregation behaviour in confined simple shear flow of binary suspensions of fluid-filled elastic capsules are investigated in a model system that resembles blood. We study this problem with direct simulations as well as with a master equation model that incorporates two key sources of wall-normal particle transport: wall-induced migration and hydrodynamic pair collisions. The simulation results indicate that, in a mixture of large and small particles with equal capillary numbers, the small particles marginate, while the large particles antimarginate in their respective dilute suspensions. Here margination refers to localization of particles near walls, while antimargination refers to the opposite. In a mixture of particles with equal size and unequal capillary number, the stiffer particles marginate while the flexible particles antimarginate. The master equation model traces the origins of the segregation behaviour to the size and rigidity dependence of the wall-induced migration velocity and of the cross-stream particle displacements in various types of collisions. In particular, segregation by rigidity, especially at low volume fractions, is driven in large part by heterogeneous collisions, in which the stiff particle undergoes larger displacement. In contrast, segregation by size is driven mostly by the larger wall-induced migration velocity of larger particles. Additionally, a non-local drift-diffusion equation is derived from the master equation model, which provides further insights into the segregation behaviour.

JFM classification

Biological Fluid Dynamics: Blood flow Biological Fluid Dynamics: Capsule/cell dynamics Complex Fluids: Suspensions

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Type
Papers
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Journal of Fluid Mechanics , Volume 738 , 10 January 2014 , pp. 423 - 462
Copyright
©2013 Cambridge University Press 

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