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Wall shear stress from jetting cavitation bubbles

Published online by Cambridge University Press:  04 May 2018

Qingyun Zeng
Affiliation:
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
Silvestre Roberto Gonzalez-Avila
Affiliation:
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
Rory Dijkink
Affiliation:
School of Life Science, Engineering & Design, Saxion University of Applied Sciences, M. H. Tromplaan 28, 7513AB Enschede, The Netherlands
Phoevos Koukouvinis
Affiliation:
City, University of London, School of Mathematics, Computer Science and Engineering, Northampton Square, London EC1V 0HB, UK
Manolis Gavaises
Affiliation:
City, University of London, School of Mathematics, Computer Science and Engineering, Northampton Square, London EC1V 0HB, UK
Claus-Dieter Ohl*
Affiliation:
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore Institute of Physics, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39016 Magdeburg, Germany
*
Email address for correspondence: [email protected]

Abstract

The collapse of a cavitation bubble near a rigid boundary induces a high-speed transient jet accelerating liquid onto the boundary. The shear flow produced by this event has many applications, examples of which are surface cleaning, cell membrane poration and enhanced cooling. Yet the magnitude and spatio-temporal distribution of the wall shear stress are not well understood, neither experimentally nor by simulations. Here we solve the flow in the boundary layer using an axisymmetric compressible volume-of-fluid solver from the OpenFOAM framework and discuss the resulting wall shear stress generated for a non-dimensional distance, $\unicode[STIX]{x1D6FE}=1.0$ ( $\unicode[STIX]{x1D6FE}=h/R_{max}$ , where $h$ is the distance of the initial bubble centre to the boundary, and $R_{max}$ is the maximum spherical equivalent radius of the bubble). The calculation of the wall shear stress is found to be reliable once the flow region with constant shear rate in the boundary layer is determined. Very high wall shear stresses of 100 kPa are found during the early spreading of the jet, followed by complex flows composed of annular stagnation rings and secondary vortices. Although the simulated bubble dynamics agrees very well with experiments, we obtain only qualitative agreement with experiments due to inherent experimental challenges.

Type
JFM Papers
Copyright
© 2018 Cambridge University Press 

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Zeng et al. supplementary movie

Resolved flow close to the boundary during bubble collapse and re-expansions.

Download Zeng et al. supplementary movie(Video)
Video 14 MB