Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/163943
Title: Wall shear stress from jetting cavitation bubbles: influence of the stand-off distance and liquid viscosity
Authors: Zeng, Qingyun
An, Hongjie
Ohl, Claus-Dieter
Keywords: Science::Physics
Issue Date: 2022
Source: Zeng, Q., An, H. & Ohl, C. (2022). Wall shear stress from jetting cavitation bubbles: influence of the stand-off distance and liquid viscosity. Journal of Fluid Mechanics, 932, A14-. https://dx.doi.org/10.1017/jfm.2021.997
Journal: Journal of Fluid Mechanics
Abstract: We study systematically the cavitation-induced wall shear stress on rigid boundaries as a function of liquid viscosity and stand-off distance using axisymmetric volume of fluid (VoF) simulations. Here, is defined with the initial distance of bubble centre from the wall and the bubble equivalent radius at its maximum expansion. 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 and the inverse Reynolds number. 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 follows (kPa) for <![CDATA[$0.5<\gamma. 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 with for and for, where is the jet impact velocity and is the distance between lower bubble interface and wall prior to impact.
URI: https://hdl.handle.net/10356/163943
ISSN: 0022-1120
DOI: 10.1017/jfm.2021.997
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 The Author(s). Published by Cambridge University Press. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

SCOPUSTM   
Citations 10

39
Updated on Apr 19, 2024

Web of ScienceTM
Citations 20

19
Updated on Oct 29, 2023

Page view(s)

125
Updated on Apr 16, 2024

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.