Effective viscosity of microswimmer suspensions

Details Effective viscosity of microswimmer suspensions Effective viscosity of microswimmer suspensions

2009-09-23

arxiv.org/abs/0909.4193v2

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

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 micro-algae (\textit{Chlamydomonas Reinhardtii}) is far greater than for suspensions containing the same volume fraction of dead cells and suspensions show shear thinning behaviour. 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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