Energy Dissipation in Transient Gaseous Cavitation
Publication: Journal of Hydraulic Engineering
Volume 131, Issue 8
Abstract
The aim of the paper is to examine nonfriction energy dissipation in transient cavitating flows and to verify whether they can be attributed to thermic exchange between gas bubbles and the surrounding liquid or to gas release and solution process. A two-dimensional (2D) numerical model for liquid flow with a small amount of free gas is proposed. The results of the numerical runs are compared with experimental data of pressure head oscillations in transient cavitating flow. Both thermic exchange and gas release can explain some of the dissipation if a relaxation process is assumed. However, the 2D model, including the thermodynamics of the gaseous phase, does not seem to fully explain the observed dissipation. The 2D model with gas release allows for a good simulation of the experimental data after a suitable calibration of the model parameters.
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Acknowledgments
The writers acknowledge the support of the Italian Ministry of Education, University and Research (National Project on “Influence of vorticity and turbulence in interactions of water bodies with their boundary elements and effects on hydraulic design”). The writers also acknowledge the help of Dr. Peter Connor for revising the English of the final version of the manuscript.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 131 • Issue 8 • August 2005
Pages: 724 - 732
Copyright
© 2005 ASCE.
History
Received: Mar 20, 2003
Accepted: Aug 31, 2004
Published online: Aug 1, 2005
Published in print: Aug 2005
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