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Article Dans Une Revue Physical Review Fluids Année : 2018

Trapping and exclusion zones in complex streaming patterns around a large assembly of microuidic bubbles under ultrasound

Résumé

Pulsating bubbles have proved to be a versatile tool for trapping and sorting particles. In this article, we investigate the dierent streaming patterns that can be obtained with a group of bubbles in a conned geometry under ultrasound. In the presence of an external ow strong enough to oppose the streaming velocities but not to drag the trapped bubbles, we observe either the appearance of exclusion zones near the bubbles or asymmetric streaming patterns that we interpret as the superposition of a 2D streaming function and of a potential ow. When studying a lattice of several bubbles, we show that the streaming pattern can be accurately predicted by superimposing the contributions of every pair of bubbles present in the lattice, thus allowing one to predict the sizes and the shapes of exclusion zones created by a group of bubbles under acoustic excitation. We suggest that such systems could be used to enhance mixing at small scale, or to catch and release chemical species initially trapped in vortices created around bubble pairs.
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Dates et versions

hal-01709188 , version 1 (14-02-2018)
hal-01709188 , version 2 (08-07-2019)

Identifiants

Citer

Thomas A Combriat, Flore Mekki-Berrada, Pierre Thibault, Philippe Marmottant. Trapping and exclusion zones in complex streaming patterns around a large assembly of microuidic bubbles under ultrasound. Physical Review Fluids, 2018, 3 (1), pp.013602. ⟨10.1103/PhysRevFluids.3.013602⟩. ⟨hal-01709188v2⟩

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