TITLE

Kinetics of cavitation and luminescence for spherically focusing shock waves in liquids

AUTHOR(S)
Teslenko, Vyacheslav S.; Sankin, Georgii N.; Drozhzhin, Aleksey P.
PUB. DATE
July 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 524 Issue 1, p375
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The hydrodynamic processes due to spherically focusing acoustic shock waves in liquids are discussed. Luminescence recording has been combined with pressure measurement and high-speed photo recording. An electromagnetic generator of shock waves, shaped as a sphere segment, is used in the experiments. The complex nonlinear hydrodynamic processes are caused by cavitation in the shock wave (∼ 1 µs) focus both in the unbounded volume and near a free surface in the liquid. It is shown experimentally that: 1) Along the focal axis the rarefaction wave is transformed into a compression cavitation shock wave (CSW). The observed effect can be named the effect of &ldq;nonlinear amplification of sound&rdq;. 2) Advanced cavitation in the focal area near a free surface results in the quasi-collective collapse of cavities with the &ldq;sultan&rdq; hydrodynamic effect. 3) The first luminescence pulse correlates with the cavitation breakdown in a liquid. It is suggested that this luminescence pulse is caused by electrokinetic processes in expanding and in forming cavities.
ACCESSION #
5665256

 

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