Fast X-ray imaging of cavitating flows

Khlifa, Ilyass (author), Vabre, Alexandre (author), Hočevar, Marko (author), Fezzaa, Kamel (author), Fuzier, Sylvie (author), Roussette, Olivier (author), Coutier-Delgosha, Olivier (author)

A new method based on ultra-fast X-ray imaging was developed in this work for the investigation of the dynamics and the structures of complex two-phase flows. In this paper, cavitation was created inside a millimetric 2D Venturi-type test section, while seeding particles were injected into the flow. Thanks to the phase-contrast enhancement technique provided by the APS (Advanced Photon Source) synchrotron beam, high definition X-ray images of the complex cavitating flows were obtained. These images contain valuable information about both the liquid and the gaseous phases. By means of image processing, the two phases were separated, and velocity fields of each phase were, therefore, calculated using image cross-correlations. The local vapour volume fractions were also obtained, thanks to the local intensity levels within the recorded images. These simultaneous measurements, provided by this new technique, afford more insight into the structure and the dynamic of two-phase flows as well as the interactions between them, and hence enable to improve our understanding of their behaviour. In the case of cavitating flows inside a Venturi-type test section, the X-ray measurements demonstrate, for the first time, the presence of significant slip velocities between the phases within sheet cavities for both steady and unsteady flow configurations.

• Language: English
• Keywords: cavitation, measurements, x rays
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Submitted for review: 17.08.2017
• Article acceptance date: 03.09.2017
• Publication date: 20.10.2017
• Year: 2017
• Number of pages: Str. 1-22
• Numbering: Vol. 58
• PID: 20.500.12556/RUL-126671
• UDC: 620.193.16:615.849.11(045)
• ISSN on article: 0723-4864
• DOI: 10.1007/s00348-017-2426-7
• COBISS.SI-ID: 15738139
• Publication date in RUL: 03.05.2021

Record is a part of a journal

• Title: Experiments in fluids
• Shortened title: Exp. fluids
• Publisher: Springer Nature
• ISSN: 0723-4864
• COBISS.SI-ID: 7427589

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: 01.11.2017

Secondary language

• Language: Slovenian
• Keywords: kavitacija, meritve, rentgenski žarki

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: Electricité de France (EDF-R&D)

• Funder: Other - Other funder or multiple funders
• Funding programme: CETIM