Robert Mettin: abstract Sevilla 2002

Bubble structures in acoustic cavitation: observation and modelling of a 'jellyfish'-streamer

R. Mettin, J. Appel, D. Krefting, R. Geisler, P. Koch, and W. Lauterborn

Drittes Physikalisches Institut, Universität Göttingen,
Bürgerstraße 42-44, D-37073 Göttingen, Germany


Abstract

Most applications of high power ultrasound in chemical processing and cleaning are based on energy concentration by strong bubble collapses. Utilized effects are mainly surface erosion, microstreaming, and free radical production. In typical resonator set-ups cavitation bubbles form structures (streamers) that are distributed inhomogeneously in space, which usually is a drawback for applications. The pattern formation processes are still not completely understood. Detailed observation and classification of streamers is necessary to get more knowledge about the underlying mechanisms. The paper presents recent results on a particular acoustic cavitation bubble structure that appears in different resonator cells. Pictures of this structure, that has the form of a jellyfish, are presented and a possible explanation is given on the basis of a multibubble simulation approach.


in: Forum Acusticum Sevilla, Spain, 16-20 Sept. 2002
Special Issue of the Revista de Acustica, Vol. XXXIII, 2002, ULT-02-004-IP
[on CDROM, ISBN 84-87985-06-8].


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