Photofocusing: Light and flow of phototactic microswimmer suspension

Abstract : We explore in this paper the phenomenon of photofocusing: a coupling between flow vorticity and biased swimming of microalgae toward a light source that produces a focusing of the microswimmer suspension. We combine experiments that investigate the stationary state of this phenomenon as well as the transition regime with analytical and numerical modeling. We show that the experimentally observed scalings on the width of the focalized region and the establishment length as a function of the flow velocity are well described by a simple theoretical model.
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https://hal.archives-ouvertes.fr/hal-01338449
Contributor : Salima Rafaï <>
Submitted on : Tuesday, August 23, 2016 - 9:51:19 AM
Last modification on : Tuesday, September 11, 2018 - 9:24:02 AM
Long-term archiving on : Thursday, November 24, 2016 - 12:41:48 PM

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Matthieu Martin, Alexandre Barzyk, Eric Bertin, Philippe Peyla, Salima Rafaï. Photofocusing: Light and flow of phototactic microswimmer suspension. Physical Review E , American Physical Society (APS), 2016, 93 (5), pp.051101(R). ⟨10.1103/PhysRevE.93.051101⟩. ⟨hal-01338449⟩

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