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Contributions to the acoustic excitation of bubbles released from a nozzle

Czerski, H; Deane, GB; (2010) Contributions to the acoustic excitation of bubbles released from a nozzle. The Journal of the Acoustical Society of America , 128 (5) , Article 2625. 10.1121/1.3484087. Green open access

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Abstract

It has recently been demonstrated that air bubbles released from a nozzle are excited into volume mode oscillations by the collapse of the neck of air formed at the moment of bubble detachment. A pulse of sound is caused by these breathing mode oscillations, and the sound of air-entraining flows is made up of many such pulses emitted as bubbles are created. This paper is an elaboration on a JASA-EL paper, which examined the acoustical excitation of bubbles released from a nozzle. Here, further details of the collapse of a neck of air formed at the moment of bubbleformation and its implications for the emission of sound by newly formed bubbles are presented. The role of fluid surface tension was studied using high-speed photography and found to be consistent with a simple model for neck collapse. A re-entrant fluid jet forms inside the bubble just after detachment, and its role in acoustic excitation is assessed. It is found that for slowly-grown bubbles the jet does make a noticeable difference to the total volume decrease during neck collapse, but that it is not a dominant effect in the overall acoustic excitation.

Type: Article
Title: Contributions to the acoustic excitation of bubbles released from a nozzle
Open access status: An open access version is available from UCL Discovery
DOI: 10.1121/1.3484087
Publisher version: http://dx.doi.org/10.1121/1.3484087
Language: English
Additional information: Copyright 2010 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in (Czerski, H; Deane, GB; (2010) Contributions to the acoustic excitation of bubbles released from a nozzle. The Journal of the Acoustical Society of America , 128 (5) , Article 2625 and may be found at http://dx.doi.org/10.1121/1.3484087.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1426201
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