The final stage of the collapse of a cloud of bubbles close to a rigid boundary

The final stage of the collapse of a hemispherical cloud of bubbles close to a rigid boundary was investigated by ultra high-speed photography with up to 200 million frames/s. Our investigations reveal two types of secondary shock wave emission during cloud rebound. In the first case, the secondary...

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Veröffentlicht in:Ultrasonics sonochemistry 2011, Vol.18 (1), p.59-64
Hauptverfasser: Brujan, E.A., Ikeda, T., Yoshinaka, K., Matsumoto, Y.
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Sprache:eng
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Zusammenfassung:The final stage of the collapse of a hemispherical cloud of bubbles close to a rigid boundary was investigated by ultra high-speed photography with up to 200 million frames/s. Our investigations reveal two types of secondary shock wave emission during cloud rebound. In the first case, the secondary shock wave emission is a consequence of the free collapse of a bubble within the cloud by the ambient pressure in the fluid. In the second case, it is a consequence of the interaction of the cloud-collapse-induced shock wave with microbubbles situated close to the collapse site of the cloud. The latter can be very powerful, resulting in a secondary shock wave emission with a maximum amplitude of about 0.5 GPa.
ISSN:1350-4177
1873-2828
DOI:10.1016/j.ultsonch.2010.07.004