The Rayleigh prolongation factor at small bubble to wall stand-off distances

The Rayleigh collapse time is the time it would take to shrink an empty spherical bubble in an infinite liquid domain to zero size, which is a function of ambient pressure and initial bubble radius. If a solid boundary is located in the vicinity of the shrinking or collapsing bubble, then liquid flo...

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Main Authors: Reuter, Fabian, Zeng, Qingyun, Ohl, Claus-Dieter
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/163942
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1639422022-12-22T08:38:28Z The Rayleigh prolongation factor at small bubble to wall stand-off distances Reuter, Fabian Zeng, Qingyun Ohl, Claus-Dieter School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Cavitation Bubble Dynamics The Rayleigh collapse time is the time it would take to shrink an empty spherical bubble in an infinite liquid domain to zero size, which is a function of ambient pressure and initial bubble radius. If a solid boundary is located in the vicinity of the shrinking or collapsing bubble, then liquid flow is hindered, such that the collapse time is prolonged. This can be quantified with the Rayleigh prolongation factor. Here, we provide for intermediate to smallest bubble to wall stand-off distances. It is measured with single laser-induced cavitation bubbles in water close to a solid boundary. Maximum bubble radii are determined from microscopic high-speed imaging at one million frames per second. Collapse times are measured acoustically via the acoustic transients emitted during bubble seeding and collapse. The experimental findings are compared, with good agreement, to numerical simulations based on a volume of fluid method. As a result, a polynomial fit of versus stand-off distance is given for the near-wall bubble collapse in water. Then the influence of the viscosity on is studied numerically in the near-wall regime. Published version This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under grant OH 75/4-1. 2022-12-22T08:38:28Z 2022-12-22T08:38:28Z 2022 Journal Article Reuter, F., Zeng, Q. & Ohl, C. (2022). The Rayleigh prolongation factor at small bubble to wall stand-off distances. Journal of Fluid Mechanics, 944, A11-. https://dx.doi.org/10.1017/jfm.2022.475 0022-1120 https://hdl.handle.net/10356/163942 10.1017/jfm.2022.475 2-s2.0-85133442634 944 A11 en Journal of Fluid Mechanics © 2022 The Author(s). Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/ licenses/by/4.0), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
Cavitation
Bubble Dynamics
spellingShingle Engineering::Mechanical engineering
Cavitation
Bubble Dynamics
Reuter, Fabian
Zeng, Qingyun
Ohl, Claus-Dieter
The Rayleigh prolongation factor at small bubble to wall stand-off distances
description The Rayleigh collapse time is the time it would take to shrink an empty spherical bubble in an infinite liquid domain to zero size, which is a function of ambient pressure and initial bubble radius. If a solid boundary is located in the vicinity of the shrinking or collapsing bubble, then liquid flow is hindered, such that the collapse time is prolonged. This can be quantified with the Rayleigh prolongation factor. Here, we provide for intermediate to smallest bubble to wall stand-off distances. It is measured with single laser-induced cavitation bubbles in water close to a solid boundary. Maximum bubble radii are determined from microscopic high-speed imaging at one million frames per second. Collapse times are measured acoustically via the acoustic transients emitted during bubble seeding and collapse. The experimental findings are compared, with good agreement, to numerical simulations based on a volume of fluid method. As a result, a polynomial fit of versus stand-off distance is given for the near-wall bubble collapse in water. Then the influence of the viscosity on is studied numerically in the near-wall regime.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Reuter, Fabian
Zeng, Qingyun
Ohl, Claus-Dieter
format Article
author Reuter, Fabian
Zeng, Qingyun
Ohl, Claus-Dieter
author_sort Reuter, Fabian
title The Rayleigh prolongation factor at small bubble to wall stand-off distances
title_short The Rayleigh prolongation factor at small bubble to wall stand-off distances
title_full The Rayleigh prolongation factor at small bubble to wall stand-off distances
title_fullStr The Rayleigh prolongation factor at small bubble to wall stand-off distances
title_full_unstemmed The Rayleigh prolongation factor at small bubble to wall stand-off distances
title_sort rayleigh prolongation factor at small bubble to wall stand-off distances
publishDate 2022
url https://hdl.handle.net/10356/163942
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