Hideki Ueno

A discharge phenomenon was investigated to clarify basic property on cavitation bubble plasma in sodium chloride solution. The discharge plasma emission was observed by using charge coupled device camera with a high speed gated image intensifier unit. Generation and annihilation of plasma in the same cavitation bubbles were continuously repeated. The arch-like discharge path was formed on upper parts of the opposite electrodes because of cavitation bubbles produced on the upper parts of the electrodes besides the rotor part., which gradually extended to the direction that the solution flowed through. The maximum height of the arch-like discharge path was 4 mm, meanwhile the voltage of 160 pulses was applied between the electrodes. It was suggested that these phenomena were repeated in the different cavitation bubbles.