Dynamic of cavitation bubble in a flowing liquid with a pressure gradient

In the present study, a high energy pulsed laser is used to generate a millimetric cavitation bubble within a water °ow over a symmetric hydrofoil. The bubble is initiated at di®erent locations in the vicinity of the hydrofoil leading edge. A high speed camera is used to observe the motion of the bubble as it travels along the hydrofoil suction side. Besides the stando® parameter, we have found that the pressure gradient plays a major role on bubble dynamic and subsequent phenomena. For a speci¯c initial location of the bubble, the micro-jet is no more directed towards the hydrofoil surface, as commonly observed in still water. In this case, we have also observed a spectacular behaviour of the cavity rebound, which migrates towards the solid surface despite of the outward direction of the micro-jet. This result di®ers from the behaviour of a bubble near a solid surface in water at rest or water °owing uniformly since the micro-jet is normally directed toward the solid. Supported by Swiss National Science Foundation (Grant No 200020-116641)


Published in:
Bulletin of the American Physical Society, DFD 2009, 54, 19, 36
Presented at:
62nd Annual Meeting of the APS Division of Fluid Dynamics, Minneapolis, Minnesota, USA, November 22-24, 2009
Year:
2009
Publisher:
American Physical Society
ISSN:
0003-0503
Keywords:
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2011-10-21, last modified 2018-09-13

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