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    The effect of ambient pressure on ejecta sheets from free-surface ablation

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    Type
    Article
    Authors
    Marston, J. O.
    Mansoor, Mohammad M. cc
    Thoroddsen, Sigurdur T cc
    Truscott, T. T. cc
    KAUST Department
    High-Speed Fluids Imaging Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2016-04-16
    Online Publication Date
    2016-04-16
    Print Publication Date
    2016-05
    Permanent link to this record
    http://hdl.handle.net/10754/621586
    
    Metadata
    Show full item record
    Abstract
    We present observations from an experimental study of the ablation of a free liquid surface promoted by a focused laser pulse, causing a rapid discharge of liquid in the form of a very thin conical-shaped sheet. In order to capture the dynamics, we employ a state-of-the-art ultra-high-speed video camera capable of capturing events at (Formula presented.) fps with shutter speeds down to 20 ns, whereby we were able to capture not only the ejecta sheet, but also the shock wave, emerging at speeds of up to 1.75 km/s, which is thus found to be hypersonic (Mach 5). Experiments were performed at a range of ambient pressures in order to study the effect of air drag on the evolution of the sheet, which was always observed to dome over, even at pressures as low as 3.8 kPa. At reduced pressures, the extended sheet evolution led to the formation of interference fringe patterns from which, by comparison with the opening speed of rupture, we were able to determine the ejecta thickness. © 2016, Springer-Verlag Berlin Heidelberg.
    Citation
    Marston JO, Mansoor MM, Thoroddsen ST, Truscott TT (2016) The effect of ambient pressure on ejecta sheets from free-surface ablation. Experiments in Fluids 57. Available: http://dx.doi.org/10.1007/s00348-016-2141-9.
    Sponsors
    The research was partially funded by KAUST Office of Competitive Research Funds. The authors thank Jesse Belden for assistance with the interferometry calculations.
    Publisher
    Springer Nature
    Journal
    Experiments in Fluids
    DOI
    10.1007/s00348-016-2141-9
    ae974a485f413a2113503eed53cd6c53
    10.1007/s00348-016-2141-9
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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