TY - JOUR
T1 - The effect of ambient pressure on ejecta sheets from free-surface ablation
AU - Marston, J. O.
AU - Mansoor, Mohammad M.
AU - Thoroddsen, Sigurdur T
AU - Truscott, T. T.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The research was partially funded by KAUST Office of Competitive Research Funds. The authors thank Jesse Belden for assistance with the interferometry calculations.
PY - 2016/4/16
Y1 - 2016/4/16
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/621586
UR - http://link.springer.com/10.1007/s00348-016-2141-9
UR - http://www.scopus.com/inward/record.url?scp=84963728471&partnerID=8YFLogxK
U2 - 10.1007/s00348-016-2141-9
DO - 10.1007/s00348-016-2141-9
M3 - Article
SN - 0723-4864
VL - 57
JO - Experiments in Fluids
JF - Experiments in Fluids
IS - 5
ER -