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RESEARCH PAPERS

A Limited Role of Separation Bubble in Desinent Cavitation

[+] Author and Article Information
Y. Ito, R. Oba

Institute of High Speed Mechanics, Tohoku University, Sendai, Japan

J. Fluids Eng 107(1), 121-125 (Mar 01, 1985) (5 pages) doi:10.1115/1.3242427 History: Received May 17, 1983; Online October 26, 2009

Abstract

In order to clarify whether a separation bubble always plays an important role, the desinence of streamer-cavitation, a kind of attached-cavitation, was carefully investigated in typical internal flows through venturies with and without a 40 μm thin backward facing step under a prescribed cavitation nuclei as well as various hydrodynamic conditions. The following facts have been found: (i) the separation bubble can play an important role in the desinence only when the separation bubble thickness H is larger than the diameter of nucleus dnp that may grow up to a critical one [18], (ii) a marked change takes place in the desinent cavitation number σd due to the step, i.e., σd ≅ |Cps | for H > dnp but σd < |Cps | for H ≦ dnp , (iii) for the cavitation there are two geneses, i.e., the nuclei floating within the separation bubble and the bubble-cloud occurring in the reattachment-region.

Copyright © 1985 by ASME
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