An analysis of the acoustic cavitation noise spectrum: The role of periodic shock waves

Song, J. H., Johansen, K. and Prentice, P. (2016) An analysis of the acoustic cavitation noise spectrum: The role of periodic shock waves. Journal of the Acoustical Society of America, 140, pp. 2494-2505. (doi: 10.1121/1.4964633)

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Research on applications of acoustic cavitation is often reported in terms of the features within the spectrum of the emissions gathered during cavitation occurrence. There is, however, limited understanding as to the contribution of specific bubble activity to spectral features, beyond a binary interpretation of stable versus inertial cavitation. In this work, laser-nucleation is used to initiate cavitation within a few millimeters of the tip of a needle hydrophone, calibrated for magnitude and phase from 125 kHz to 20 MHz. The bubble activity, acoustically driven at f0 = 692 kHz, is resolved with high-speed shadowgraphic imaging at 5 × 106 frames per second. A synthetic spectrum is constructed from component signals based on the hydrophone data, deconvolved within the calibration bandwidth, in the time domain. Cross correlation coefficients between the experimental and synthetic spectra of 0.97 for the f 0/2 and f 0/3 regimes indicate that periodic shock waves and scattered driving field predominantly account for all spectral features, including the sub-harmonics and their over-harmonics, and harmonics of f 0.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Johansen, Kristoffer and Prentice, Dr Paul and Song, Dr Jae Hee
Authors: Song, J. H., Johansen, K., and Prentice, P.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Journal of the Acoustical Society of America
Publisher:Acoustical Society of America
ISSN (Online):1520-8524
Published Online:12 October 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in Journal of the Acoustical Society of America 140:2494-2505
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
722331TheraCav - Harnessing Cavitation for TherapyPaul PrenticeEuropean Research Council (ERC)336189ENG - ENGINEERING SYSTEMS POWER & ENERGY