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

Nicolas Chastrette, Michaël Baudoin, Philippe Brunet, Laurent Royon, and Régis Wunenburger
Phys. Rev. Fluids 7, 124201 – Published 5 December 2022
PDFHTMLExport Citation

Abstract

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 23 November 2020
  • Accepted 1 November 2022

DOI:https://doi.org/10.1103/PhysRevFluids.7.124201

©2022 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Fluid Dynamics

Authors & Affiliations

Nicolas Chastrette1,2, Michaël Baudoin3,4, Philippe Brunet2, Laurent Royon5, and Régis Wunenburger1,*

  • 1Sorbonne Université, CNRS, Institut Jean Le Rond d'Alembert, F-75005 Paris, France
  • 2Université de Paris, MSC, UMR 7057, CNRS, F-75013 Paris, France
  • 3Univ. Lille, CNRS, Centrale Lille, ISEN, Univ. Polytechnique Hauts de France, UMR 8520, IEMN, F-59000 Lille, France
  • 4Institut Universitaire de France, 1 rue Descartes, 75231 Paris Cedex 05, France
  • 5Université de Paris, LIED, UMR 8236, CNRS, F-75013 Paris, France

  • *regis.wunenburger@sorbonne-universite.fr

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 7, Iss. 12 — December 2022

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Fluids

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×