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RESEARCH PAPERS

Dynamics of an Elongated Bubble During Collapse

[+] Author and Article Information
A. Crespo, F. Castro, F. Manuel

Cátedra de Mecánica de Fluidos, E.T.S. Ingenieros Industrials, U.P.M., 28006 Madrid, Spain

J. Hernández

Dept. Mecánica, E.T.S.I.I., U.N.E.D., Ciudad Universitaria, 28040 Madrid, Spain

J. Fluids Eng 112(2), 232-237 (Jun 01, 1990) (6 pages) doi:10.1115/1.2909393 History: Received September 22, 1988; Online May 23, 2008

Abstract

An analytical model is presented to describe the collapse of an elongated bubble, which appears in the core of a cavitating vortex. The flow field is assumed to be irrotational, due to a sink line. The kinematic and dynamic conditions are applied only at the tip and in the middle of the bubble surface. This simplified theory must retain losses of mechanical energy near the tips of the bubble, which are due to a microjet. In order to check the validity of this model, the irrotational flow equations have been solved numerically by using a panel method; the numerical results agree with the analytical ones and confirm the existence of the microjet at the tip. The agreement with experimental results is also good. For very slender bubbles the speed near the tips becomes very large, and this may be cause of cavitation damage. A simplified approach is proposed to explain the flow in the microjet.

Copyright © 1990 by The American Society of Mechanical Engineers
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