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Multiphase Science and Technology
SJR: 0.124 SNIP: 0.222 CiteScore™: 0.26

ISSN Druckformat: 0276-1459
ISSN Online: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v10.i4.10
pages 303-321

CLOUD CAVITATION: OBSERVATIONS, CALCULATIONS AND SHOCK WAVES

Christopher E. Brennen
California Institute of Technology, Pasadena, California 91125, USA

ABSTRAKT

A recent significant advance in our understanding of cavitating flows is the importance of the interactions between bubbles in determining the coherent motions, dynamic and acoustic, of the bubbly cavitating fluid. Recent experimental and computational findings show that the collapse of clouds of cavitating bubbles involve the formation of bubbly shock waves and that the focusing of these shock waves is responsible for the enhanced noise and damage in cloud cavitation. The recent experiments of Reisman et al. (1998) complement the work begun by Morch and Kedrinskii and their co-workers and demonstrate that the very large impulsive pressures generated in bubbly cloud cavitation are caused by shock waves generated by the collapse mechanics of the bubbly cavitating mixture. Two particular types of shocks were observed: large ubiquitous global pressure pulses caused by the separation and collapse of individual clouds from the downstream end of the cavitation and much more localized local pressure pulses which occur much more randomly within the bubbly cloud.
This 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.