Elucidating the oscillation instability of sessile drops triggered by surface acoustic waves
Fluid Dynamics
2022-01-24 v1
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 interplay between hydrodynamics, acoustics and capillarity. We decipher the instability by combining high-speed imaging with 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.
Keywords
Cite
@article{arxiv.2201.08792,
title = {Elucidating the oscillation instability of sessile drops triggered by surface acoustic waves},
author = {Nicolas Chastrette and Michael Baudoin and Philippe Brunet and Laurent Royon and Regis Wunenburger},
journal= {arXiv preprint arXiv:2201.08792},
year = {2022}
}
Comments
6 pages, 4 figures