Experimental study of the liquid flow near a single sonoluminescent bubble.

Authors

T.Verraes, T.Lepoint, F.Lepoint-Mullie and M.S.Longuet-Higgins

Publication

J. Acoust. Soc. Am. Vol. 108, Issue 1, p117-125. [July 2000]
[http://scitation.aip.org/jasa/]

Abstract

Tracers (sulphur particles produced in situ by a bubble itself, fuchsin spots and dust) were used to probe the liquid flows in the neighborhood of single sonoluminescent bubbles maintained in levitation in a resonant acoustic setup. The flows caused by the bubble were distinguished clearly from the streamings (mean Lagrangian velocity: ~20 µm/s) associated with resonant cells in the absence of a bubble. The liquid flow due to the presence of the bubble formed around it over a few mm. The radial component of the Lagrangian velocities (maximum value measured: ~260 µm/s) of this flow evolved as r–1, with r as the distance from the bubble, while the tangential component remained approximately constant (~20 µm/s). In the Appendix by M. S. Longuet-Higgins, a simplified model of microstreaming involving a spherical bubble in translational and radial oscillation gives a qualitative description of the experiments. A fairly good agreement was observed between the experiments and the modeling, which involved a dipole flow enclosed in a Stokeslet.