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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

Michael Baudoin
Philippe Brunet
Régis Wunenburger

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 behaviour 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)

Identifiants

  • HAL Id : hal-03885908 , version 1

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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. ⟨hal-03885908v1⟩
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