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Stratification effect of air bubble on the shock wave from the collapse of cavitation bubble

Published online by Cambridge University Press:  25 May 2021

Jing Luo Open the ORCID record for Jing Luo [Opens in a new window] ,
Weilin Xu  and
Boo Cheong Khoo
Jing Luo
Affiliation:
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, PR China
Weilin Xu*
Affiliation:
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, PR China
Boo Cheong Khoo
Affiliation:
Temasek Laboratories, National University of Singapore, Singapore 117411, Republic of Singapore Department of Mechanical Engineering, National University of Singapore, Singapore 119260, Republic of Singapore
*
†Email address for correspondence: xuwl@scu.edu.cn
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Abstract

This paper presents an experimental study on the mechanism of interaction between a cavitation bubble and an air bubble. The cavitation bubble was generated by means of the low-voltage discharge method, and the combination of high-speed photography and a pressure measurement system allowed for simultaneous observation and measurement of the evolution of the shock wave and the change in shock wave strength with the presence of the air bubble in the vicinity. The high-speed imaging revealed the predominant roles of the relative distance φ and relative size ε between the cavitation and air bubbles in the determination of the stratification effect that the air bubble exerted on the shock wave produced from the first collapse of the cavitation bubble. The pressure measurement indicated that, when the air bubble did not merge with the cavitation bubble, the aforementioned factors, together with the angle $\alpha $ formed by the air bubble, cavitation bubble and the measuring point, would jointly affect the attenuation of the pressure peak and energy of the shock wave. Quantitatively, the attenuation magnitude was proportional to $a{(\alpha \varphi /\varepsilon )^b}$, where the values of the coefficients a and b depended on whether the shock wave was stratified or not. When the cavitation bubble and the air bubble merged, the energy and the pressure peak of the shock wave decreased to less than 40 % of the values in the absence of the air bubble. With the new insight into bubble–bubble interaction mechanisms, the findings will facilitate a better understanding and development of cavitation utilization and prevention technology in water--air two phase systems.

JFM classification

Compressible Flows: Shock waves Drops and Bubbles: Cavitation Drops and Bubbles: Bubble dynamics

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Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 919 , 25 July 2021 , A16
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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