28 May 1997 Pressure caused by behavior of a bubble originated from an underwater spark discharge
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Proceedings Volume 2869, 22nd International Congress on High-Speed Photography and Photonics; (1997) https://doi.org/10.1117/12.273423
Event: 22nd International Congress on High-Speed Photography and Photonics, 1996, Santa Fe, NM, United States
Abstract
Sheets of metal can be bulged by impulsive high pressure produced by the underwater spark discharge. The following two matters are considered as the cause of the impulsive pressure. One is generation of a spherical shock wave that results from rapid evaporation of water by heat of an arc and another is that of a rapid water flow called a microjet that arises from the movement of a bubble containing water vapor produced by the arc. It is supposed that the pressure produced by the latter is not less effective than the shock wave on bulging sheets of metal. In order to make the effect of the water flow on the forming clear, we have bulged each aluminum plate (thickness equals 0.2 [mm]) set up on a die with a hole (diameter equals 3 [mm]) in the center of it by the underwater spark discharge and examined how the height of bulge of each aluminum plate varies with variable distance between the spark gap and the aluminum plate. Besides we have observed the behavior of the bubble by a high speed camera. As a result of this study, it is reported that there is the most suitable distance between the spark gap and the aluminum plate for bulging, because the pressure caused by the rapid water flow, that is, the microjet operates most effectively on the aluminum plate at that distance.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kohji Isuzugawa, Kohji Isuzugawa, T. Tsuji, T. Tsuji, Y. Fushimi, Y. Fushimi, M. Toda, M. Toda, Hiroyuki Yoshikawa, Hiroyuki Yoshikawa, } "Pressure caused by behavior of a bubble originated from an underwater spark discharge", Proc. SPIE 2869, 22nd International Congress on High-Speed Photography and Photonics, (28 May 1997); doi: 10.1117/12.273423; https://doi.org/10.1117/12.273423
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