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    Cavity formation by the impact of Leidenfrost spheres

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    Type
    Article
    Authors
    Marston, Jeremy
    Vakarelski, Ivan Uriev cc
    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
    2012-05-09
    Online Publication Date
    2012-05-09
    Print Publication Date
    2012-05
    Permanent link to this record
    http://hdl.handle.net/10754/562175
    
    Metadata
    Show full item record
    Abstract
    We report observations of cavity formation and subsequent collapse when a heated sphere impacts onto a liquid pool. When the sphere temperature is much greater than the boiling point of the liquid, we observe an inverted Leidenfrost effect where the sphere is encompassed by a vapour layer that prevents physical contact with the liquid. This creates the ultimate non-wetting scenario during sphere penetration through a free surface, producing very smooth cavity walls. In some cases during initial entry, however, the liquid contacts the sphere at the equator, leading to the formation of a dual cavity structure. For cold sphere impacts, where a contact line is observed, we reveal details of the contact line pinning, which initially forms a sawtooth pattern. We also observe surface waves on the cavity interface for cold spheres. We compare our experimental results to previous studies of cavity dynamics and, in particular, the influence of hydrophobicity on the entry of the sphere. © 2012 Cambridge University Press.
    Citation
    Marston, J. O., Vakarelski, I. U., & Thoroddsen, S. T. (2012). Cavity formation by the impact of Leidenfrost spheres. Journal of Fluid Mechanics, 699, 465–488. doi:10.1017/jfm.2012.124
    Sponsors
    This work was partially supported by KAUST AEA grant 7000000028.
    Publisher
    Cambridge University Press (CUP)
    Journal
    Journal of Fluid Mechanics
    DOI
    10.1017/jfm.2012.124
    ae974a485f413a2113503eed53cd6c53
    10.1017/jfm.2012.124
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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