X-ray computed tomography of cavitating flow in a converging-diverging nozzle

Conference paper (2018)

Authors

S. Jahangir Fluid Mechanics - Mechanical, Maritime and Materials Engineering
E.C. Wagner ChemE/Afdelingsbureau
R.F. Mudde Executive board, ImPhys/Imaging Physics
C. Poelma Multi Phase Systems - Mechanical, Maritime and Materials Engineering
Research Group
Fluid Mechanics (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2018 S. Jahangir, E.C. Wagner, R.F. Mudde, C. Poelma
DOI: https://doi.org/10.1115/1.861851_ch209
X-ray computed tomography Venturi Cloud cavitation
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Published Date

2018

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Fluid Mechanics

Abstract

Cavitation is a complex multiphase phenomenon, where the production of vapor bubbles leads to opaqueness of the flow. While it is nearly impossible to visualize the interior of the cavitation region with visible light, we show that with X-ray computed tomography it is possible to obtain the time-averaged void fraction distribution in an axisymmetric converging-diverging nozzle (venturi). This technique is based on the amount of energy absorbed by the material, based on its density and thickness. Time-averaged 3D reconstruction of the X-ray images is used (i) to distinguish between vapor and liquid phase, (ii) to get radial geometric features of the flow, and (iii) to quantify the local void fraction. The results show the presence of intense cavitation at the walls of the venturi, and the vapor fraction decreases downstream of the venturi with the vapor cloud.

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