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Title
Japanese:水中へ放出した大気圧アークプラズマの速度変化 
English:Change in Velocity of Atmospheric-Pressure Arc Plasma Released into Water 
Author
Japanese: 赤塚洋, 川村隼, 根津篤.  
English: Hiroshi Akatsuka, Jun Kawamura, Atsushi Nezu.  
Language Japanese 
Journal/Book name
Japanese:令和4年 電気学会 基礎・材料・共通部門大会要旨集 
English:Abstract & Keywords of 2022 Annual Conference of Fundamentals and Materials Society, IEE Japan 
Volume, Number, Page        
Published date Aug. 30, 2022 
Publisher
Japanese:一般社団法人 電気学会 
English:IEE Japan 
Conference name
Japanese:令和4年電気学会基礎・材料・共通部門大会 
English:The 2022 Annual Conference of Fundamentals and Materials Society IEE of Japan 
Conference site
Japanese:西之表 
English:Nishinoomote 
Official URL https://www.iee.jp/fms/wp-content/uploads/sites/2/2022/09/A-Taikai_2022_Program_V17.pdf
 
Abstract A non-transferred atmospheric pressure argon arc jet is ejected into water from an anode nozzle to study thermohydraulic characteristics. The plasma temperature dropped sharply around 10-13 mm downstream measured from the nozzle. Since the arc diameter was found to be almost constant, the arc velocity can be traced from the mass-flux conservation, which was found subsonic over the whole volume in the water. The velocity dropped sharply in the aforementioned region, where its velocity approximately agreed with the sonic velocity in the water. It is considered that energy dissipation occurred near the sonic velocity of water. Even if the plasma is subsonic, the flow characteristics may depend on the sonic velocity of the surrounding water.

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