Strong shear flows release gaseous nuclei from surface micro- and nanobubbles

Zibo Ren, Shuhong Liu, Beng Hau Tan, Fabian Denner, Fabien Evrard, Berend van Wachem, Zhigang Zuo, and Claus-Dieter Ohl
Phys. Rev. Fluids 6, 043601 – Published 16 April 2021
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Abstract

The unexpectedly low cavitation inception threshold of water is widely attributed to the presence of cavitation nuclei either in the bulk water or attached to immersed surfaces. Being compressible, such objects are expected to respond to modest tensile stresses. Surprisingly, a large corpus of experiments shows that micro- and nanobubbles attached to planar smooth surfaces are unresponsive to tensile stresses, seemingly ruling out their ability to serve as cavitation nuclei. Here, using optical microscopy we show that, although these surface micro- and nanobubbles are not directly responsive to tensile stresses induced by a nearby cavitation bubble, strong short-lived shear flows induced by cavitation jetting cause tethers to extend from the surface micro- and nanobubbles and lead to the pinch-off of daughter bubbles. Our results show a unique and previously unanticipated mechanism for the generation of cavitation nuclei.

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  • Received 5 May 2020
  • Revised 2 September 2020
  • Accepted 22 March 2021

DOI:https://doi.org/10.1103/PhysRevFluids.6.043601

©2021 American Physical Society

Physics Subject Headings (PhySH)

Fluid DynamicsPolymers & Soft Matter

Authors & Affiliations

Zibo Ren1, Shuhong Liu1,*, Beng Hau Tan2, Fabian Denner3, Fabien Evrard3, Berend van Wachem3, Zhigang Zuo1,†, and Claus-Dieter Ohl4,‡

  • 1State Key Laboratory of Hydro Science and Engineering, and Department of Energy and Power Engineering, Tsinghua University, 100084 Beijing, China
  • 2Low Energy Electronic Systems, Singapore-MIT Alliance for Research and Technology, 1 Create Way, 138602 Singapore
  • 3Chair of Mechanical Process Engineering, Institute of Process Engineering, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
  • 4Department Soft Matter, Institute for Physics, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany

  • *liushuhong@mail.tsinghua.edu.cn
  • zhigang200@mail.tsinghua.edu.cn
  • claus-dieter.ohl@ovgu.de

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Issue

Vol. 6, Iss. 4 — April 2021

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