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Title: The Rayleigh prolongation factor at small bubble to wall stand-off distances
Authors: Reuter, Fabian
Zeng, Qingyun
Ohl, Claus-Dieter
Keywords: Engineering::Mechanical engineering
Issue Date: 2022
Source: 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-.
Journal: Journal of Fluid Mechanics
Abstract: 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.
ISSN: 0022-1120
DOI: 10.1017/jfm.2022.475
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 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 ( licenses/by/4.0), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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