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Faculty of Mechanical Engineering, Lj. (FSLJ)
  • Kelvin-Helmholtz instability as one of the key features for fast and efficient emulsification by hydrodynamic cavitation
    Boček, Žan ...
    The paper investigates the oil–water emulsification process inside a micro-venturi channel. More specifically, the possible influence of Kelvin-Helmholtz instability on the emulsification process. ... High-speed visualizations were conducted inside a square venturi constriction with throat dimensions of 450 µm by 450 µm, both under visible light and X-Rays. We show that cavity shedding caused by the instability results in the formation of several cavity vortices. Their rotation causes the deformation of the oil stream into a distinct wave-like shape, combined with fragmentation into larger drops due to cavitation bubble collapse. Later on, the cavity collapse further disperses the larger drops into a finer emulsion. Thus, it turns out that the Kelvin-Helmholtz instability is similarly characteristic for hydrodynamic cavitation emulsification inside a microchannel as is the Rayleigh-Taylor instability for acoustically driven emulsion formation.
    Source: Ultrasonics Sonochemistry. - ISSN 1350-4177 (Vol. 108, [article no.] 106970, Aug. 2024, str. 1-9)
    Type of material - article, component part ; adult, serious
    Publish date - 2024
    Language - english
    COBISS.SI-ID - 201951491

    Link(s):

    https://www.sciencedirect.com/science/article/pii/S1350417724002189
    Repository of the University of Ljubljana – RUL
    DOI

source: Ultrasonics Sonochemistry. - ISSN 1350-4177 (Vol. 108, [article no.] 106970, Aug. 2024, str. 1-9)

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