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Article Dans Une Revue Physical Review Fluids Année : 2022

Elucidating the oscillation instability of sessile drops triggered by surface acoustic waves

Résumé

The oscillation instability of sessile drops is ubiquitous in surface acoustic wave (SAW) -powered digital microfluidics. Yet the physics underlying these phenomena has not been elucidated owing to the complex interplay between hydrodynamics, acoustics, and capillarity. We decipher the instability by combining high-speed imaging of the droplet surface vibration with inner acoustic pressure measurements. We rationalize the observed behavior with a model inspired from optomechanics, which couples an intracavity acoustic mode excited by the SAW to a surface deformation eigenmode through amplitude modulation and delayed radiation pressure feedback
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Dates et versions

hal-03885908 , version 1 (11-11-2022)
hal-03885908 , version 2 (02-01-2023)

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Nicolas Chastrette, Michael Baudoin, Philippe Brunet, Laurent Royon, Régis Wunenburger. Elucidating the oscillation instability of sessile drops triggered by surface acoustic waves. Physical Review Fluids, 2022, 7 (12), pp.124201. ⟨10.1103/PhysRevFluids.7.124201⟩. ⟨hal-03885908v2⟩
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