Characterization of shock waves in power ultrasound

Journal article


Khavari, M., Priyadarshi, A., Hurrell, A., Pericleous, K., Eskin, D. and Tzanakis, I. 2021. Characterization of shock waves in power ultrasound. Journal of Fluid Mechanics. 915, pp. 1-14. https://doi.org/10.1017/jfm.2021.186
AuthorsKhavari, M., Priyadarshi, A., Hurrell, A., Pericleous, K., Eskin, D. and Tzanakis, I.
Abstract

The application of cavitation-induced shock waves generated at low driving frequencies, known as power ultrasound, is essential for a wide range of fields, such as sonochemistry, lithotripsy, nanomaterials, emulsions and casting, to name but a few. In this paper, we present measurements of the shock wave pressures emitted by cavitating bubbles in water, under ultrasonic excitation produced by an immersed probe oscillating at 24 kHz. A broad-spectrum fibre-optic hydrophone calibrated in the range of 1–30 MHz was used for this purpose. Spectral analysis of the data reveals a consistent resonance peak at a very narrow range of frequencies (3.27–3.43 MHz). Results were confirmed using real-time analysis of high-speed recordings. By eliminating other possible sources, we propose that this new peak might be associated with shock wave emissions from collapsing bubbles. Spatial maps obtained by collating individual shock wave pressures highlight the effect of pressure shielding with increasing input power, attributed to a cloud of bubbles surrounding the probe. This work contributes towards the elucidation of the key properties of cavitation-driven shock waves and the underlying mechanisms, essential in controlling the effectiveness of the external processing conditions on various physical, chemical and biological systems.

Keywordsshock waves; cavitation; ultrasound
Year2021
JournalJournal of Fluid Mechanics
Journal citation915, pp. 1-14
PublisherCambridge University Press
ISSN0022-1120
1469-7645
Digital Object Identifier (DOI)https://doi.org/10.1017/jfm.2021.186
Web address (URL)http://dx.doi.org/10.1017/jfm.2021.186
Publisher's version
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File Access Level
Open
Output statusPublished
Publication dates25 May 2021
Publication process dates
Accepted26 Feb 2021
Deposited26 Apr 2023
Supplemental file
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File Access Level
Open
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