Measuring Oscillatory Velocity Fields Due to Swimming Algae

Details Measuring Oscillatory Velocity Fields Due to Swimming Algae Measuring Oscillatory Velocity Fields Due to Swimming Algae

2010-10-08

arxiv.org/abs/1010.1787v1

Physics

Fluid Dynamics

1 page, 2 videos

Scientific paper

In this fluid dynamics video, we present the first time-resolved measurements of the oscillatory velocity field induced by swimming unicellular microorganisms. Confinement of the green alga C. reinhardtii in stabilized thin liquid films allows simultaneous tracking of cells and tracer particles. The measured velocity field reveals complex time-dependent flow structures, and scales inversely with distance. The instantaneous mechanical power generated by the cells is measured from the velocity fields and peaks at 15 fW. The dissipation per cycle is more than four times what steady swimming would require.

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