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  • Laser-induced cavitation bubbles and shock waves in water near a concave surface
    Požar, Tomaž ; Agrež, Vid ; Petkovšek, Rok, fizik
    The interplay among the cavitation structures and the shock waves following a nanosecond laser breakdown in water in the vicinity of a concave surface was visualized with high-speed shadowgraphy and ... schlieren cinematography. Unlike the generation of the main cavitation bubble near a flat or a convex surface, the concave surface refocuses the emitted shock waves and causes secondary cavitation near the acoustic focus which is most pronounced when triggered by the shock wave released during the first main bubble collapse. The shock wave propagation, reflection from the concave surface and its scattering on the dominant cavity is clearly resolvable on the shadowgraphs. The schlieren approach revealed the pressure build up in the last stage of the collapse and the first stage of the rebound. A persistent low-density watermark is left behind the first collapse. The observed effects are important wherever cavities collapse near indented surfaces, such as in cavitation peening, cavitation erosion and ophthalmology.
    Vir: Ultrasonics Sonochemistry. - ISSN 1350-4177 (Vol. 73, May 2021, str. 1-11)
    Vrsta gradiva - članek, sestavni del
    Leto - 2021
    Jezik - angleški
    COBISS.SI-ID - 45742083

vir: Ultrasonics Sonochemistry. - ISSN 1350-4177 (Vol. 73, May 2021, str. 1-11)

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