Title: Experimental investigation of internal two-phase flow structures and dynamics of quasi-stable sheet cavitation by fast synchrotron x-ray imaging

Abstract

The quasi-stable sheet cavitation produced in a small Venturi channel is investigated using a fast synchrotron X-ray imaging technique aided with conventional high speed photography. The use of X-rays instead of visible light solves cavitation opacity related issues, and X-ray phase contrast-based edge enhancement enables high-definition visualization of the internal two-phase morphology. The simultaneous acquisition of time-resolved velocity and void fraction fields through post-processing the recorded X-ray images reveals, for the first time, the complex diphasic flow structures inside the sheet cavity, which is essentially divided into 6 characteristic parts. Distinct from the current mainstream view, the globallysteady sheet cavitation is found to be characterized by a weak but constantly-existing re-entrant flow that can penetrate the entire cavity. The turbulent velocity fluctuations inside the sheet cavity are also investigated. The turbulence level in the reverse flow region is observed to be as low as in the outer main flow demonstrating the relatively steady status of the reentrant flow. Unlike the streamwise and cross-stream fluctuations, the shear stress appears to be weakly correlated with the velocity gradient. The collapse of vapor phase and the vaporization at the upstream cavity interface are found to be the primary causes of shear stress intensification.

Authors:

Zhang, Guangjian  ^[1];

• Search DOE PAGES for author "Zhang, Guangjian"
• Search DOE PAGES for ORCID "0000-0002-3122-001X"

Khlifa, Ilyass ^[2]; Fezzaa, Kamel  ^[3];

• Search DOE PAGES for author "Fezzaa, Kamel"
• Search DOE PAGES for ORCID "0000-0001-6135-8450"

Ge, Mingming  ^[4];

• Search DOE PAGES for author "Ge, Mingming"
• Search DOE PAGES for ORCID "0000-0002-3918-6805"

Coutier-Delgosha, Olivier ^[5]

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+ Show Author Affiliations

1. Univ. Lille, (France). CNRS, ONERA, Arts et Métiers ParisTech, LMFL - Laboratoire de Mécanique des fluides de Lille - Kampé de Feriet; Jiangsu Univ., Zhenjiang (China)
2. Univ. Lille, (France). CNRS, ONERA, Arts et Métiers ParisTech, LMFL - Laboratoire de Mécanique des fluides de Lille - Kampé de Feriet
3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
4. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Dept. of of Aerospace and Ocean Engineering
5. Univ. Lille, (France). CNRS, ONERA, Arts et Métiers ParisTech, LMFL - Laboratoire de Mécanique des fluides de Lille - Kampé de Feriet; Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Dept. of of Aerospace and Ocean Engineering

Publication Date:

Sun Nov 01 00:00:00 EDT 2020

Research Org.:

Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:

China Scholarship Council; USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1812012

Grant/Contract Number:  

AC02-06CH11357; 201608320260

Resource Type:

Accepted Manuscript

Journal Name:

Physics of Fluids

Additional Journal Information:

Journal Volume: 32; Journal Issue: 11; Journal ID: ISSN 1070-6631

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 42 ENGINEERING