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Wall shear stress from jetting cavitation bubbles: influence of the stand-off distance and liquid viscosity

Published online by Cambridge University Press:  02 December 2021

Qingyun Zeng Open the ORCID record for Qingyun Zeng [Opens in a new window] ,
Hongjie An  and
Claus-Dieter Ohl Open the ORCID record for Claus-Dieter Ohl [Opens in a new window]
Qingyun Zeng
Affiliation:
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Republic of Singapore 637371
Hongjie An*
Affiliation:
Queensland Micro and Nanotechnology Centre, Griffith University, Nathan, QLD 4111, Australia
Claus-Dieter Ohl*
Affiliation:
Department Soft Matter, Institute for Physics, Otto-von-Guericke-University Magdeburg, Universitätsplatz 2, 39016 Magdeburg, Germany
*
†Email addresses for correspondence: hongjie.an@griffith.edu.au, claus-dieter.ohl@ovgu.de
†Email addresses for correspondence: hongjie.an@griffith.edu.au, claus-dieter.ohl@ovgu.de
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Abstract

We study systematically the cavitation-induced wall shear stress on rigid boundaries as a function of liquid viscosity $\mu$ and stand-off distance $\gamma$ using axisymmetric volume of fluid (VoF) simulations. Here, $\gamma =d/R_{max}$ is defined with the initial distance of bubble centre from the wall $d$ and the bubble equivalent radius at its maximum expansion $R_{max}$. The simulations predict accurately the overall bubble dynamics and the time-dependent liquid film thickness between the bubble and the wall prior to the collapse. The spatial and temporal wall shear stress is discussed in detail as a function of $\gamma$ and the inverse Reynolds number $1/Re$. The amplitude of the wall shear stress is investigated over a large parameter space of viscosity and stand-off distance. The inward stress is caused by the shrinking bubble and its maximum value $\tau _{mn}$ follows $\tau _{mn} Re^{0.35}=-70\gamma +110$ (kPa) for $0.5<\gamma <1.4$. The expanding bubble and jet spreading on the boundary produce an outward-directed stress. The maximum outward stress is generated shortly after impact of the jet during the early spreading. We find two scaling laws for the maximum outward stress $\tau _{mp}$ with $\tau _{mp} \sim \mu ^{0.2} h_{jet}^{-0.3} U_{jet}^{1.5}$ for $0.5\leq \gamma \leq 1.1$ and $\tau _{mp} \sim \mu ^{-0.25} h_{jet}^{-1.5} U_{jet}^{1.5}$ for $\gamma \geq 1.1$, where $U_{jet}$ is the jet impact velocity and $h_{jet}$ is the distance between lower bubble interface and wall prior to impact.

JFM classification

Drops and Bubbles: Bubble dynamics Drops and Bubbles: Cavitation

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Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 932 , 10 February 2022 , A14
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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