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The transition from sheet to cloud cavitation

Pelz, P. F. ; Keil, T. ; Groß, T. F. (2017)
The transition from sheet to cloud cavitation.
In: Journal of Fluid Mechanics, 817
doi: 10.1017/jfm.2017.75
Article, Bibliographie

Abstract

Recent studies indicate that the transition from sheet to cloud cavitation depends on both cavitation number and Reynolds number. In the present paper this transition is investigated analytically and a physical model is introduced. In order to include the entire process, the model consists of two parts, a model for the growth of the sheet cavity and a viscous film flow model for the so-called re-entrant jet. The models allow the calculation of the length of the sheet cavity for given nucleation rates and initial nuclei radii and the spreading history of the viscous film. By definition, the transition occurs when the re-entrant jet reaches the point of origin of the sheet cavity, implying that the cavity length and the penetration length of the re-entrant jet are equal. Following this criterion, a stability map is derived showing that the transition depends on a critical Reynolds number which is a function of cavitation number and relative surface roughness. A good agreement was found between the model-based calculations and the experimental measurements. In conclusion, the presented research shows the evidence of nucleation and bubble collapse for the growth of the sheet cavity and underlines the role of wall friction for the evolution of the re-entrant jet.

Item Type: Article
Erschienen: 2017
Creators: Pelz, P. F. ; Keil, T. ; Groß, T. F.
Type of entry: Bibliographie
Title: The transition from sheet to cloud cavitation
Language: English
Date: April 2017
Publisher: Cambridge University Press
Journal or Publication Title: Journal of Fluid Mechanics
Volume of the journal: 817
DOI: 10.1017/jfm.2017.75
URL / URN: https://www.cambridge.org/core/journals/journal-of-fluid-mec...
Abstract:

Recent studies indicate that the transition from sheet to cloud cavitation depends on both cavitation number and Reynolds number. In the present paper this transition is investigated analytically and a physical model is introduced. In order to include the entire process, the model consists of two parts, a model for the growth of the sheet cavity and a viscous film flow model for the so-called re-entrant jet. The models allow the calculation of the length of the sheet cavity for given nucleation rates and initial nuclei radii and the spreading history of the viscous film. By definition, the transition occurs when the re-entrant jet reaches the point of origin of the sheet cavity, implying that the cavity length and the penetration length of the re-entrant jet are equal. Following this criterion, a stability map is derived showing that the transition depends on a critical Reynolds number which is a function of cavitation number and relative surface roughness. A good agreement was found between the model-based calculations and the experimental measurements. In conclusion, the presented research shows the evidence of nucleation and bubble collapse for the growth of the sheet cavity and underlines the role of wall friction for the evolution of the re-entrant jet.

Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Fluid Systems (FST) (since 01.10.2006)
16 Department of Mechanical Engineering > Institute for Fluid Systems (FST) (since 01.10.2006) > Cavitation and Generic Flows in Turbo Machinery and Systems
Date Deposited: 26 Apr 2017 14:45
Last Modified: 07 Dec 2023 08:38
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