Microbubble Formation in Underwater Pulsed Streamer Discharge
H. H. Kim, Y. Teramoto, T. Hirakawa, N. Negishi, and A. Ogata
Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), Japan
Abstract- This paper first presents the size distribution of microbubbles in pulsed streamer discharge in water without external gas feeding. The conductivity of water influenced not only the streamer property but also the size distribution of microbubbles. In the case of deionized water most of microbubbles were found in the size range below 100 μm with a peak size of about 40 μm. On the other hand the tap water produced microbubbles in a wide range from 30 μm to 800 μm with much less number concentration. Growth and coalescence of the plasma-induced bubbles were also visualized on a time-scale of microseconds to milliseconds using a high-speed camera.
Keywords- Underwater pulsed discharge, microbubble, bubble coalescence, high-speed camera visualization