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    Micro-splashing by drop impacts

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    Type
    Article
    Authors
    Thoroddsen, Sigurdur T cc
    Takehara, Kohsei
    Etoh, Takeharugoji
    KAUST Department
    Clean Combustion Research Center
    High-Speed Fluids Imaging Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2012-07-18
    Online Publication Date
    2012-07-18
    Print Publication Date
    2012-09
    Permanent link to this record
    http://hdl.handle.net/10754/562243
    
    Metadata
    Show full item record
    Abstract
    We use ultra-high-speed video imaging to observe directly the earliest onset of prompt splashing when a drop impacts onto a smooth solid surface. We capture the start of the ejecta sheet travelling along the solid substrate and show how it breaks up immediately upon emergence from the underneath the drop. The resulting micro-droplets are much smaller and faster than previously reported and may have gone unobserved owing to their very small size and rapid ejection velocities, which approach 100 m s-1, for typical impact conditions of large rain drops. We propose a phenomenological mechanism which predicts the velocity and size distribution of the resulting microdroplets. We also observe azimuthal undulations which may help promote the earliest breakup of the ejecta. This instability occurs in the cusp in the free surface where the drop surface meets the radially ejected liquid sheet. © 2012 Cambridge University Press.
    Citation
    Thoroddsen, S. T., Takehara, K., & Etoh, T. G. (2012). Micro-splashing by drop impacts. Journal of Fluid Mechanics, 706, 560–570. doi:10.1017/jfm.2012.281
    Sponsors
    S.T.T. was partially supported by KAUST GCR AEA Grant 70000000028 (Fine-Resolution Printing).
    Publisher
    Cambridge University Press (CUP)
    Journal
    Journal of Fluid Mechanics
    DOI
    10.1017/jfm.2012.281
    ae974a485f413a2113503eed53cd6c53
    10.1017/jfm.2012.281
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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