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Lateral migration and segregation of vesicles with viscosity contrast in simple shear and Poiseuille flows

Published online by Cambridge University Press:  15 March 2011

Gwennou Coupier ,
Natacha Callens ,
Badr Kaoui ,
Christophe Minetti ,
Frank Dubois ,
Chaouqi Misbah  and
Thomas Podgorski
Gwennou Coupier
Affiliation:
Laboratoire de Spectrométrie Physique, Université Joseph Fourier (Grenoble I) and CNRS, 140 Rue de la Physique, F138402 St Martin d'Hères Cedex, France
Natacha Callens
Affiliation:
Microgravity Research Center, Université Libre de Bruxelles, 50 Av. F. Roosevelt, CP 165/62, B11050 Brussels, Belgium
Badr Kaoui
Affiliation:
Laboratoire de Spectrométrie Physique, Université Joseph Fourier (Grenoble I) and CNRS, 140 Rue de la Physique, F138402 St Martin d'Hères Cedex, France Université Hassan II 1 Mohammedia, Faculté des Sciences Ben M'Sik, Laboratoire de Physique de la Matière Condensée, BP 7955 Casablanca, Morocco
Christophe Minetti
Affiliation:
Microgravity Research Center, Université Libre de Bruxelles, 50 Av. F. Roosevelt, CP 165/62, B11050 Brussels, Belgium
Frank Dubois
Affiliation:
Microgravity Research Center, Université Libre de Bruxelles, 50 Av. F. Roosevelt, CP 165/62, B11050 Brussels, Belgium
Chaouqi Misbah
Affiliation:
Laboratoire de Spectrométrie Physique, Université Joseph Fourier (Grenoble I) and CNRS, 140 Rue de la Physique, F138402 St Martin d'Hères Cedex, France
Thomas Podgorski
Affiliation:
Laboratoire de Spectrométrie Physique, Université Joseph Fourier (Grenoble I) and CNRS, 140 Rue de la Physique, F138402 St Martin d'Hères Cedex, France
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Abstract

Lateral migration of vesicles (closed lipidic membranes) in a flow is characterized as a function of the relevant flow parameters and mechanical properties of the vesicles. We consider low Reynolds number flows, and migration is only due to viscous effects. Through experiments and simulations, we exhibit two different origins for such cross streamline migration: the presence of a wall, and a non1constant shear rate, as for instance in a Poiseuille flow. Such migration modifies the distribution of vesicles in a sheared polydisperse suspension; we present preliminary results proving that the hydrodynamic interactions between vesicles greatly modify the distribution of vesicles according to their sizes and deflation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1132: Symposium Z – Mechanics of Biological and Biomedical Materials , 2008 , 1132-Z02-09
Copyright
Copyright © Materials Research Society 2009

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References

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