Characterising the cavitation activity generated by an ultrasonic horn at varying tip-vibration amplitudes

Yusuf, L., Symes, M. D. and Prentice, P. (2021) Characterising the cavitation activity generated by an ultrasonic horn at varying tip-vibration amplitudes. Ultrasonics Sonochemistry, 70, 105273. (doi: 10.1016/j.ultsonch.2020.105273) (PMID:32795929)

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Dual-perspective high-speed imaging and acoustic detection is used to characterise cavitation activity at the tip of a commercial 20 kHz (f0) ultrasonic horn, over 2 s sonications across the range of input powers available (20 – 100%). Imaging at 1 × 105 frames per second (fps) captures cavitation-bubble cluster oscillation at the horn-tip for the duration of the sonication. Shadowgraphic imaging at 2 Mfps, from an orthogonal perspective, probes cluster collapse and shock wave generation at higher temporal resolution, facilitating direct correlation of features within the acoustic emission data generated by the bubble activity. f0/m subharmonic collapses of the primary cavitation cluster directly beneath the tip, with m increasing through integer values at increasing input powers, are studied. Shock waves generated by periodic primary cluster collapses dominate the non-linear emissions of the cavitation noise spectra. Transitional input powers for which the value of m is indistinct, are identified. Overall shock wave content within the emission signals collected during sonications at transitional input powers are reduced, relative to input powers with distinct m. The findings are relevant for the optimisation of applications such as sonochemistry, known to be mediated by bubble collapse phenomena.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Yusuf, Dr Lukman and Symes, Professor Mark and Prentice, Dr Paul
Creator Roles:
Yusuf, L.Methodology, Software, Visualization, Data curation, Formal analysis
Symes, M. D.Resources, Funding acquisition, Writing – review and editing
Prentice, P.Conceptualization, Methodology, Writing – original draft, Supervision, Funding acquisition
Authors: Yusuf, L., Symes, M. D., and Prentice, P.
College/School:College of Science and Engineering > School of Chemistry
College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Ultrasonics Sonochemistry
ISSN (Online):1873-2828
Published Online:06 August 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Ultrasonics Sonochemistry 70: 105273
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
172395TheraCavPaul PrenticeEuropean Research Council (ERC)336189ENG - Systems Power & Energy
190559Upgrading the small scale equipment base for early career researchers in the engineering and physical sciencesMiles PadgettEngineering and Physical Sciences Research Council (EPSRC)EP/K031732/1P&S - Physics & Astronomy
173495Driving energetically uphill processes using metal-ligand coordination complexesMark SymesThe Royal Society (ROYSOC)UF150104Chemistry