Brennen, Christopher E. (1997) Some Current Advances in Cavitation Research. In: Korean Society of Mechanical Engineers 1997 Spring Annual Meeting, April 1997. http://resolver.caltech.edu/CaltechAUTHORS:CEBksme97b
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Several recent experimental and analytical investigations of cavitating flows have revealed new phenomena which clearly affect how we should view cavitation growth and collapse and the strategies used to ameliorate its adverse effects. On the scale of individual bubbles it is now clear that the dynamics and acoustics of single bubbles are severely affected by the distortion of the bubble by the flow. This distortion depends on the typical dimension and velocity of the flow (as well as the Reynolds number) and therefore the distortion effects are very important in the process of scaling results up from the model to the prototype. The first part of the lecture will discuss the implications of these new observations for the classic problem of scale-up. Another recent revelation is the importance of the interactions between bubbles in determining the coherent motions, dynamic and acoustic, of a cloud of cavitation bubbles. The second part of the lecture focusses on these cloud cavitation effects. It is shown that the collapse of a cloud of cavitating bubbles involves the formation of a bubbly shock wave and it is suggested that the focussing of these shock waves is responsible for the enhanced noise and damage in cloud cavitation. The paper describes experiments and calculations conducted to investigate these phenomena in greater detail as part of an attempt to find ways of ameliorating the most destructive effects associated with cloud cavitation.
|Item Type:||Conference or Workshop Item (Paper)|
|Additional Information:||My profound thanks to the graduate studcnts who contributed to the results described, Luca d'Agostino, Steven Ceccio, Douglas Hart, Sanjay Kumar, Yan Kuhn de Chizelle, Beth McKenney, Zhenhuan Liu, Yi-Chun Wang and Garrett Reisman. As always, Allan Acosta provided valuable insights and inspiration. I am also deeply grateful for the support of the Office of Naval Research who sponsored much of the research and supported the preparation of this paper under Contracts N00014-91-5-1295 and N00014-97-1-0002.|
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|Deposited By:||Christopher Brennen|
|Deposited On:||30 Dec 2004|
|Last Modified:||26 Dec 2012 08:39|
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