Khavari, Mohammad, Priyadarshi, Abhinav, Morton, Justin, Porfyrakis, Kyriakos ORCID: 0000-0003-1364-0261, Pericleous, Kyriacos A ORCID: 0000-0002-7426-9999, Eskin, Dmitry and Tzanakis, Iakovos (2023) Cavitation-induced shock wave behaviour in different liquids. Ultrasonics Sonochemistry, 94:106328. pp. 1-11. ISSN 1350-4177 (doi:https://doi.org/10.1016/j.ultsonch.2023.106328)

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Abstract

This paper follows our earlier work where a strong high frequency pressure peak has been observed as a consequence of the formation of shock waves due to the collapse of cavitation bubbles in water, excited by an ultrasonic source at 24 kHz. We study here the effects of liquid physical properties on the shock wave characteristics by replacing water as the medium successively with ethanol, glycerol and finally a 1:1 ethanol-water solution. The pressure frequency spectra obtained in our experiments (from more than 1.5 million cavitation collapsing events) show that the expected prominent shockwave pressure peak was barely detected for ethanol and glycerol, particularly at low input powers, but was consistently observed for the 1:1 ethanol-water solution as well as in water, with a slight shift in peak frequency for the solution. We also report two distinct features of shock waves in raising the frequency peak at MHz (inherent) and contributing to the raising of sub-harmonics (periodic). Empirically constructed acoustic pressure maps revealed significantly higher overall pressure amplitudes for the ethanol-water solution than for other liquids. Furthermore, a qualitative analysis revealed that mist-like patterns are developed in ethanol-water solution leading to higher pressures.

Item Type:	Article
Uncontrolled Keywords:	ultrasonic cavitation; shockwave dynamics
Subjects:	Q Science > Q Science (General) T Technology > T Technology (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Centre for Numerical Modelling & Process Analysis (CNMPA) Faculty of Engineering & Science > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Science & Engineering Group (CSEG) Faculty of Engineering & Science > School of Computing & Mathematical Sciences (CMS)
Last Modified:	17 Feb 2023 08:30
URI:	http://gala.gre.ac.uk/id/eprint/38572

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