Direct measurement of the flow field around swimming microorganisms

Details Direct measurement of the flow field around swimming microorganisms Direct measurement of the flow field around swimming microorganisms

2010-08-16

arxiv.org/abs/1008.2681v1

Physical Review Letters 105, 168101 (2010)

Physics

Biological Physics

4 pages, 4 figures, accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.105.168101

Swimming microorganisms create flows that influence their mutual interactions and modify the rheology of their suspensions. While extensively studied theoretically, these flows have not been measured in detail around any freely-swimming microorganism. We report such measurements for the microphytes Volvox carteri and Chlamydomonas reinhardtii. The minute ~0.3% density excess of V. carteri over water leads to a strongly dominant Stokeslet contribution, with the widely-assumed stresslet flow only a correction to the subleading source dipole term. This implies that suspensions of V. carteri have features similar to suspensions of sedimenting particles. The flow in the region around C. reinhardtii where significant hydrodynamic interaction is likely to occur differs qualitatively from a "puller" stresslet, and can be described by a simple three-Stokeslet model.

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