Diffusion Induced Bubble Populations Downstream of a Partial Cavity

[+] Author and Article Information
Po-Wen Yu, Steven L. Ceccio

Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, MI 48109-2121

J. Fluids Eng 119(4), 782-787 (Dec 01, 1997) (6 pages) doi:10.1115/1.2819498 History: Received September 01, 1996; Revised May 05, 1997; Online January 22, 2008


Bubble populations downstream of stable partial cavities were examined using in-line holography, and the bubble number distribution and void fraction of the bubbly clouds were determined. The measured flux of bubbles downstream of the cavity was used to determine the diffusion rate of noncondensable gas into the cavity. Four models of gas diffusion into partial cavities from Parkin and Kermeen (1963), Brennen (1969), and Parkin and Ravindra (1993) are reviewed, and their predictions are compared with the experimentally determined mass diffusion rates. The models, which recognize a turbulent boundary layer over the cavity interface, over-predict the diffusion rate by one order of magnitude for cavities characterized by L/δ > 25.

Copyright © 1997 by The American Society of Mechanical Engineers
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