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

Teslenko, Vyacheslav S.; Sankin, Georgii N.; Drozhzhin, Aleksey P.
July 2000
AIP Conference Proceedings;2000, Vol. 524 Issue 1, p375
Academic Journal
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.


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