Effective Viscosity of Microswimmer Suspensions

Salima Rafaï 1 Levan Jibuti 2 Philippe Peyla 2
1 LIPHY-DYFCOM
LIPhy - Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères]
Abstract : The measurement of a quantitative and macroscopic parameter to estimate the global motility of a large population of swimming biological cells is a challenge. Experiments on the rheology of active suspensions have been performed. Effective viscosity of sheared suspensions of live unicellular motile microalgae (Chlamydomonas Reinhardtii) is far greater than for suspensions containing the same volume fraction of dead cells. In addition, suspensions show shear thinning behavior. We relate these macroscopic measurements to the orientation of individual swimming cells under flow and discuss our results in the light of several existing models.
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Contributor : Salima Rafaï <>
Submitted on : Tuesday, March 19, 2013 - 1:31:49 PM
Last modification on : Tuesday, September 11, 2018 - 9:24:02 AM

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Salima Rafaï, Levan Jibuti, Philippe Peyla. Effective Viscosity of Microswimmer Suspensions. Physical Review Letters, American Physical Society, 2010, 104, pp.98102. ⟨10.1103/PHYSREVLETT.104.098102⟩. ⟨hal-00802233⟩

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