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

Abstract

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.

Keywords

cavitation;measurements;x rays;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 620.193.16:615.849.11(045)
COBISS: 15738139 Link will open in a new window
ISSN: 0723-4864
Views: 292
Downloads: 127
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Other data

Secondary language: Slovenian
Secondary keywords: kavitacija;meritve;rentgenski žarki;
Type (COBISS): Article
Embargo end date (OpenAIRE): 2018-11-01
Pages: str. 1-22
Issue: ǂVol. ǂ58
Chronology: Nov. 2017
DOI: 10.1007/s00348-017-2426-7
ID: 12852167