The effect of ambient pressure on ejecta sheets from free-surface ablation
Type
ArticleKAUST Department
High-Speed Fluids Imaging LaboratoryMechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2016-04-16Online Publication Date
2016-04-16Print Publication Date
2016-05Permanent link to this record
http://hdl.handle.net/10754/621586
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Show full item recordAbstract
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 NatureJournal
Experiments in Fluidsae974a485f413a2113503eed53cd6c53
10.1007/s00348-016-2141-9