Flagellated microswimmers: Hydrodynamics in thin liquid films

The European Physical Journal. E, Soft Matter
Daniela PimponiPaolo Gualtieri

Abstract

The hydrodynamics of a flagellated microswimmer moving in thin films is discussed. The fully resolved hydrodynamics is exploited by solving the Stokes equations for the actual geometry of the swimmer. Two different interfaces are used to confine the swimmer: a bottom solid wall and a top air-liquid interface, as appropriate for a thin film. The swimmer follows curved clockwise trajectories that can converge towards an asymptotically stable circular path or can result in a collision with one of the two interfaces. A bias towards the air-liquid interface emerges. Slight changes in the swimmer geometry and film thickness strongly affect the resulting dynamics suggesting that a very reach phenomenology occurs in the presence of confinement. Under specific conditions, the swimmer follows a "crown-like" path. Implications for the motion of bacteria close to an air bubble moving in a microchannel are discussed.

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Citations

Mar 9, 2019·The European Physical Journal. E, Soft Matter·Luca BiferaleFederico Toschi
Jun 5, 2019·Nanoscale·Chirodeep Bakli, Suman Chakraborty
Jan 25, 2020·Soft Matter·Nikhil Desai, Arezoo M Ardekani
Oct 18, 2018·The European Physical Journal. E, Soft Matter·Maria Ekiel-JeżewskaMarta Gruca

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