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Growth of bubbles containing plasma in water by high-frequency irradiation
Authors:Shinobu Mukasa  Tsunehiro Maehara  Shinfuku Nomura  Hiromichi Toyota  Ayato Kawashima  Yoshiaki Hattori  Yukio Hashimoto  Hiroshi Yamashita
Affiliation:1. Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan;2. Faculty of Agriculture, Ehime University, Matsuyama 790-8566, Japan;1. Department of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea;2. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea;3. Graduate School of EEWS (Energy, Environment, Water and Sustainability), Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea;4. Department of Physics, Kyung Hee University, Seoul 130-701, Republic of Korea;1. School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju, 61005, Republic of Korea;2. Department of Environmental Engineering, Inha University, 100 Inharo, Nam-gu, Incheon, 22212, Republic of Korea;3. School of Environmental Engineering, University of Seoul, 163 Seoulsiripdaero, Dongdaemun-gu, Seoul, 02504, Republic of Korea;4. School of Energy Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41566, Republic of Korea;5. Department of Environmental Engineering, Sunchon National University, 255 Jungang-ro, Sunchon, Jeonnam, 57922, Republic of Korea;1. Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan;2. Department of Applied and Environmental Chemistry, University of Chittagong, Chittagong 4331, Bangladesh;3. Institute of Environmental Radioactivity, Fukushima University, 1 Kanayagawa, Fukushima City, Fukushima 960-1296, Japan;4. Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan;5. Fukushima Prefectural Centre for Environmental Creation, 10-2 Fukasaku, Miharu-machi, Fukushima 963-7700, Japan
Abstract:Plasma was generated in water by irradiation at high frequency of 13.56 MHz, and the behavior of bubbles including the plasma was observed by a high-speed camera. The generation pattern of the bubbles was classified into four types according to liquid temperature and supplied power. Conducting the simulation, the maximum temperature in the bubble was found to be from 3500 K to 4300 K, and the decomposition of water molecule occurred. The gas in the bubble was found to become high ratio of hydrogen. The phenomenon can be regarded as a film boiling of exceptionally high heat flux.
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