Fast X-ray imaging of cavitating flows

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

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.

• Jezik: Angleški jezik
• Ključne besede: cavitation, measurements, x rays
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Poslano v recenzijo: 17.08.2017
• Datum sprejetja članka: 03.09.2017
• Datum objave: 20.10.2017
• Leto izida: 2017
• Št. strani: Str. 1-22
• Številčenje: Vol. 58
• PID: 20.500.12556/RUL-126671
• UDK: 620.193.16:615.849.11(045)
• ISSN pri članku: 0723-4864
• DOI: 10.1007/s00348-017-2426-7
• COBISS.SI-ID: 15738139
• Datum objave v RUL: 03.05.2021

Gradivo je del revije

• Naslov: Experiments in fluids
• Skrajšan naslov: Exp. fluids
• Založnik: Springer Nature
• ISSN: 0723-4864
• COBISS.SI-ID: 7427589

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 01.11.2017

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: kavitacija, meritve, rentgenski žarki

Projekti

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: Electricité de France (EDF-R&D)

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: CETIM