When sound slows down bubbles
Fluid Dynamics
2015-05-18 v2 Chaotic Dynamics
Pattern Formation and Solitons
Abstract
We present experimental evidence that a bubble moving in a fluid in which a well-chosen acoustic noise is superimposed can be significantly slowed down for moderate acoustic pressures. Through mean velocity measurements, we show that a condition for this effect to occur is for the acoustic noise spectrum to match or overlap the bubble's fundamental resonant mode. By rendering the bubble's oscillations and translational movements using high speed video, we evidence that radial oscillations have no effect on the mean velocity, while above a critical sound pressure threshold, Faraday waves are triggered and are responsible for the bubble's drag increase.
Keywords
Cite
@article{arxiv.1001.3792,
title = {When sound slows down bubbles},
author = {Remi Dangla and Cedric Poulain},
journal= {arXiv preprint arXiv:1001.3792},
year = {2015}
}
Comments
4 pages, to appear in Physics of Fluids