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  • Investigation of a cavitation bubble between a rigid boundary and a free surface
    Gregorčič, Peter, fizik ; Petkovšek, Rok, fizik ; Možina, Janez, fizik, 1945-
    When a high-intensity laser pulse is focused into a liquid the energy is converted into mechanical energy via an optodynamic process. The conversion starts with plasma formation: this is followed by ... shock-wave propagation and the expansion of a cavitation bubble. A cavitation bubble developed near boundaries results in an asymmetrical collapse, with the generation of a liquid jet during the bubble's rebound. In the case of a free surface this liquid jet is directed away from the surface and the oscillation times are prolonged. On the other hand, in the case of a rigid boundary, the liquid jet is directed toward the boundary and the oscillation times are shortened. We present measurements of a cavitation bubble oscillating between a free surfaceand a rigid boundary using deflections of a laser beam as the optical probe. Shadow photography was used simultaneously as a comparison during the experiments. With the beam-deflection probe we also measured the shortening ofthe oscillation times near a free surface as well as the prolongation of oscillation times near a rigid boundary. In order to explain this shortening of the cavitation-bubble oscillation times near a free surface, Rayleighćs model was extended and compared with our experimental results.
    Vir: Journal of applied physics. - ISSN 0021-8979 (Issue 9, Vol. 102, 2007, 8 str.)
    Vrsta gradiva - članek, sestavni del
    Leto - 2007
    Jezik - angleški
    COBISS.SI-ID - 10236699

    Povezava(-e):

    http://dx.doi.org/10.1063/1.2805645

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