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    Vortex-ring-induced large bubble entrainment during drop impact

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    PhysRevE.93.033128.pdf
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    Type
    Article
    Authors
    Thoraval, Marie-Jean
    Li, Yangfan
    Thoroddsen, Sigurdur T cc
    KAUST Department
    Clean Combustion Research Center
    High-Speed Fluids Imaging Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-03-29
    Permanent link to this record
    http://hdl.handle.net/10754/608614
    
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    Abstract
    For a limited set of impact conditions, a drop impacting onto a pool can entrap an air bubble as large as its own size. The subsequent rise and rupture of this large bubble plays an important role in aerosol formation and gas transport at the air-sea interface. The large bubble is formed when the impact crater closes up near the pool surface and is known to occur only for drops that are prolate at impact. Herein we use experiments and numerical simulations to show that a concentrated vortex ring, produced in the neck between the drop and the pool, controls the crater deformations and pinchoff. However, it is not the strongest vortex rings that are responsible for the large bubbles, as they interact too strongly with the pool surface and self-destruct. Rather, it is somewhat weaker vortices that can deform the deeper craters, which manage to pinch off the large bubbles. These observations also explain why the strongest and most penetrating vortex rings emerging from drop impacts are not produced by oblate drops but by more prolate drop shapes, as had been observed in previous experiments.
    Citation
    Vortex-ring-induced large bubble entrainment during drop impact 2016, 93 (3) Physical Review E
    Sponsors
    The research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST).
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review E
    DOI
    10.1103/PhysRevE.93.033128
    PubMed ID
    27078468
    arXiv
    arXiv:1601.01760
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevE.93.033128
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevE.93.033128
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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