Dynamics of cavitation induced by focused tandem shock waves in water

0376923 - ÚFP 2013 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Hoffer, Petr - Šunka, Pavel - Lukeš, Petr
Dynamics of cavitation induced by focused tandem shock waves in water.
WDS’11 Proceedings of Contributed Papers: Part II: Physics of Plasmas and Ionized Media. Praha: MATFYZPRESS, 2011 - (Šafránková, J.; Pavlů, J.), s. 267-272. ISBN 978-80-7378-185-9.
[WDS 2011 - Annual Conference of Doctoral Students /20./. Prague (CZ), 31.05.2011-03.06.2011]
Grant CEP: GA ČR GA202/09/1151
Výzkumný záměr: CEZ:AV0Z20430508
Klíčová slova: shock wave * cavitation bubble * Rayleigh-Plesset equation
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech

Cavitation associated with the generation of shock waves in water was examined. To study these processes, a tandem shock wave generator, which generates two cylindrical pressure waves focused by a metallic parabolic reflector to a common focal region, was developed. The temporal evolution of cavitation generated by shock waves at the focal region was determined experimentally using high-temporal-resolution microphotography for a certain time delay between the first and second shock waves. Observation of the focal area also showed jetting cavitation bubbles with diameters of 100 m without presence of any rigid boundary. A theoretical model that provides analytical expressions for the temporal evolution of the pressure inside the cavitation bubbles and parameters of the pressure waveform of the second shock wave at the focal area was used to improve the same measurement by PVDF sensor gauges. On the basis of this model, the amplitudes of the compression and rarefaction parts
Trvalý link: http://hdl.handle.net/11104/0209210