skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on October 20, 2018

Title: Fast X-ray imaging of cavitating flows

A new method based on ultra-fast X-ray imaging was developed in this work for simultaneous investigations of the dynamics and the structures of complex two-phase flows. Here 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 then, and hence enable to improve our understanding of their behavior. In the case of cavitating flows inside a Venturi-type test section, the X-ray measurements demonstrates, for the first time, the presence of significant slip velocities between the phases within sheet cavities for both steady and unsteadymore » flow configurations.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1] ;  [5]
  1. Arts et Metiers ParisTech, Lille (France)
  2. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France)
  3. Univ. of Ljubljana, Ljubljana (Slovenia). Faculty of Mechanical Engineering
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Kevin T. Crofton Dept. of Aerospace and Ocean Engineering
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Experiments in Fluids
Additional Journal Information:
Journal Volume: 58; Journal Issue: 11; Journal ID: ISSN 0723-4864
Publisher:
Springer
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Electricite de France (EDF)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Cavitation; Two-phase flows; Velocimetry; X-ray imaging
OSTI Identifier:
1416977