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    Bubble entrapment during sphere impact onto quiescent liquid surfaces

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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
    2011-06-20
    Online Publication Date
    2011-06-20
    Print Publication Date
    2011-08
    Permanent link to this record
    http://hdl.handle.net/10754/561802
    
    Metadata
    Show full item record
    Abstract
    We report observations of air bubble entrapment when a solid sphere impacts a quiescent liquid surface. Using high-speed imaging, we show that a small amount of air is entrapped at the bottom tip of the impacting sphere. This phenomenon is examined across a broad range of impact Reynolds numbers, 0.2 a Re = (DU0/Il) a 1.2' 105. Initially, a thin air pocket is formed due to the lubrication pressure in the air layer between the sphere and the liquid surface. As the liquid surface deforms, the liquid contacts the sphere at a finite radius, producing a thin sheet of air which usually contracts to a nearly hemispherical bubble at the bottom tip of the sphere depending on the impact parameters and liquid properties. When a bubble is formed, the final bubble size increases slightly with the sphere diameter, decreases with impact speed but appears independent of liquid viscosity. In contrast, for the largest viscosities tested herein, the entrapped air remains in the form of a sheet, which subsequently deforms upon close approach to the base of the tank. The initial contact diameter is found to conform to scalings based on the gas Reynolds number whilst the initial thickness of the air pocket or adimplea scales with a Stokes' number incorporating the influence of the air viscosity, sphere diameter and impact speed and liquid density. © 2011 Cambridge University Press.
    Citation
    MARSTON, J. O., VAKARELSKI, I. U., & THORODDSEN, S. T. (2011). Bubble entrapment during sphere impact onto quiescent liquid surfaces. Journal of Fluid Mechanics, 680, 660–670. doi:10.1017/jfm.2011.202
    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.2011.202
    ae974a485f413a2113503eed53cd6c53
    10.1017/jfm.2011.202
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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