Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
73 (1993), S. 2145-2154
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The penetration of a plasma jet into liquid water was observed at successive time intervals by means of x-ray shadowgraphy. The plasma jet was generated by producing in a polyethylene capillary tube a high-current pulsed discharge. The tube inner diameter and length were 0.64 and 22 cm, respectively. A pulse-forming network delivered 121–182 kJ of electrical energy in 500 μs. The plasma jet emerged from the open end of the tube and interacted with a column of water gel. Jet velocities around 250 m/s were measured by x-ray shadowgraphy. The water ablation rate, estimated by calculating the radiative energy flux emitted by the plasma and reaching the water surface, is approximately 0.0155 kg/s cm2. This rate is significantly lower than the measured average flux of mass lost by the water: 3.5 kg/s cm2. It is proposed, but not proven conclusively, that the main mechanism for water loss is in the form of droplets pulled apart by shear forces impressed by the plasma-water direct interaction. These droplets are entrained in the back-flowing part of the plasma jet, which streams out of the interaction chamber. Peak pressures up to 3.5×108 Pa were measured during the process.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.353141
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