20.500.12556/RUL-126671 Fast X-ray imaging of cavitating flows 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. cavitation measurements x rays kavitacija meritve rentgenski žarki true false true Angleški jezik Slovenski jezik Članek v reviji 2021-05-03 11:02:10 2021-05-03 11:02:12 2025-03-14 12:55:55 0000-00-00 00:00:00 2017 0 0 Str. 1-22 Vol. 58 Nov. 2017 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 2017-08-17 2017-09-03 2017-10-20 2018-11-01 620.193.16:615.849.11(045) 0723-4864 10.1007/s00348-017-2426-7 15738139 RAZ_Khlifa_Ilyass_2017.pdf RAZ_Khlifa_Ilyass_2017.pdf 1 7DC7D404B8FB4CD4DE9722776A891A79 8ed14d0169672b4f29cfa66ee88d6db8a0cc06c5645c4afab10b7f5cdeef3133 5674df95-abf3-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=142725 https://link.springer.com/article/10.1007/s00348-017-2426-7 1 3b40491f-abee-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=142715 Fakulteta za strojništvo 0 0 0