Darjan Podbevšek (Author), Martin Petkovšek (Author), Claus-Dieter Ohl (Author), Matevž Dular (Author)

Abstract

The paper shows visualization of cavitation inside a micro-Venturi channel. While the initial aim of the study was to establish supercavitating conditions inside a micro-Venturi, yet we found that this regime is suppressed due to the formation of a Kelvin-Helmholtz instability, which triggers a semi periodical attached cavity collapse. In depth observations using high speed imaging with visible light and X-rays revealed that this is, besides the re-entrant jet and the shock wave, a third mechanism leading to the shedding of cloud cavitation. In addition, a simple model was proposed which explains the formation of the Kelvin-Helmholtz instability in cavitating micro-Venturi and also offers explanation on why this is the dominant mechanism of cavitation cloud shedding at small scales.

Keywords

cavitation;Kelvin-Helmholtz instability;Venturi microchannel;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 532.528(045)
COBISS: 66420227 Link will open in a new window
ISSN: 0301-9322
Views: 305
Downloads: 129
Average score: 0 (0 votes)
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Other data

Secondary language: Slovenian
Secondary keywords: kavitacija;Kelvin-Helmholt nestabilnost;Venturijev mikrokanal;
Type (COBISS): Article
Pages: str. 1-7
Issue: ǂVol. ǂ142
Chronology: Sep. 2021
DOI: 10.1016/j.ijmultiphaseflow.2021.103700
ID: 13002072