Kelvin-Helmholtz instability governs the cavitation cloud shedding in Venturi microchannel

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

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.

• Language: English
• Keywords: cavitation, Kelvin-Helmholtz instability, Venturi microchannel
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 7 str.
• Numbering: Vol. 142, art. 103700
• PID: 20.500.12556/RUL-127475
• UDC: 532.528(045)
• ISSN on article: 0301-9322
• DOI: 10.1016/j.ijmultiphaseflow.2021.103700
• COBISS.SI-ID: 66420227
• Publication date in RUL: 09.06.2021

Record is a part of a journal

• Title: International journal of multiphase flow
• Shortened title: Int. j. multiph. flow
• Publisher: Elsevier
• ISSN: 0301-9322
• COBISS.SI-ID: 25649408

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: kavitacija, Kelvin-Helmholtzova nestabilnost, Venturijev mikrokanal