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  • Transition from laser-induced cavitation to acoustic cavitation driven by a sonotrode [Elektronski vir]
    Mur, Jaka ...
    Laser-induced single cavitation bubbles have been established as means of controlled cavitation due to their precisely defined timing and properties, with their use in fundamental studies and applied ... research. On the other hand, acoustic cavitation is an established technique in chemistry and biology, with mechanical vibrations at ultrasonic frequencies causing violent formation of bubble clouds, followed by flows and emulsification. In this work, an acoustic pressure field was generated using a thin sonotrode tip, operated at low amplitudes, below the threshold for acoustic cavitation. Into the generated periodic acoustic pressure field, a bubble was seeded optically by a picosecond laser. The laser energy was set just above the laser-induced breakdown threshold, optimized for repeatable generation of relatively small cavitation bubbles. We measured single bubble dynamics using high speed microscopy at kHz and MHz frame rates simultaneously, based on the shadowgraphy illumination technique. Measurements and Gilmore-model based simulations were used to assess the acoustic pressure field effects on the single-bubble dynamics and size in comparison to single laser-induced bubble dynamics in an unperturbed liquid. Further, we studied the transition from a single laser-induced bubble to an entirely acoustically driven bubble cloud.
    Source: 12th International Cavitation Symposium – CAV2024, 2-5 June 2024, Chania, Greece [Elektronski vir] (str. [1-5])
    Type of material - conference contribution ; adult, serious
    Publish date - 2024
    Language - english
    COBISS.SI-ID - 214189315

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