Numerical insight into the Kelvin-Helmholtz instability appearance in cavitating flow

Pipp, Peter (author), Hočevar, Marko (author), Dular, Matevž (author)

Recently the development of Kelvin-Helmholtz instability in cavitating flow in Venturi microchannels was discovered. Its importance is not negligible, as it destabilizes the shear layer and promotes instabilities and turbulent eddies formation in the vapor region, having low density and momentum. In the present paper, we give a very brief summary of the experimental findings and in the following, we use a computational fluid dynamics (CFD) study to peek deeper into the onset of the Kelvin-Helmholtz instability and its effect on the dynamics of the cavitation cloud shedding. Finally, it is shown that Kelvin-Helmholtz instability is beside the re-entrant jet and the condensation shock wave the third mechanism of cavitation cloud shedding in Venturi microchannels. The shedding process is quasi-periodic.

• Language: English
• Keywords: cavitation, Kelvin-Helmholtz instability, microchannel, numerical simulation
• 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: 12 str.
• Numbering: Vol. 11, iss. 6, art. 2644
• PID: 20.500.12556/RUL-125677
• UDC: 519.876.5:532.528(045)
• ISSN on article: 2076-3417
• DOI: 10.3390/app11062644
• COBISS.SI-ID: 56979971
• Publication date in RUL: 01.04.2021

Record is a part of a journal

• Title: Applied sciences
• Shortened title: Appl. sci.
• Publisher: MDPI
• ISSN: 2076-3417
• COBISS.SI-ID: 522979353

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.
• Licensing start date: 16.03.2021

Secondary language

• Language: Slovenian
• Keywords: kavitacija, Kelvin-Helmholtzova nestabilnost, mikrokanali, numerične simulacije