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

  • J. O. MarstonEmail author
  • M. M. Mansoor
  • S. T. Thoroddsen
  • T. T. Truscott
Research Article


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 \(5 \times 10^{6}\) 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.


Ambient Pressure Sheet Thickness Fringe Pattern Suction Pressure Water Entry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The research was partially funded by KAUST Office of Competitive Research Funds. The authors thank Jesse Belden for assistance with the interferometry calculations.

Supplementary material

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Supplementary material 1 (wmv 22114 KB)
348_2016_2141_MOESM2_ESM.wmv (25.2 mb)
Supplementary material 2 (wmv 25786 KB)


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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • J. O. Marston
    • 1
    Email author
  • M. M. Mansoor
    • 2
  • S. T. Thoroddsen
    • 2
  • T. T. Truscott
    • 3
  1. 1.Department of Chemical EngineeringTexas Tech UniversityLubbock USA
  2. 2.Division of Physical Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwalSaudi Arabia
  3. 3.Department of Mechanical and Aerospace EngineeringUtah State UniversityLogan USA

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