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Free-surface characteristics of liquid-metal wall jet

Kanemura, Takuji; Kondo, Hiroo; Sugiura, Hirokazu*; Hoashi, Eiji*; Yoshihashi, Sachiko*; Muroga, Takeo*; Furukawa, Tomohiro ; Hirakawa, Yasushi ; Wakai, Eiichi ; Horiike, Hiroshi*

Application studies of liquid metal (LM) wall jets are progressing in nuclear fusion researches. Examples are LM diverters or the Li target of the International Fusion Materials Irradiation Facility (IFMIF). It is important to understand flow characteristics based on measurement in order to judge whether a LM wall jet is feasible as a coolant or a nuclear target. To do so, diagnostics applicable to LM must be developed. The authors started researches on the flow characteristics of the IFMIF Li target in 2002. The diagnostics we developed are a high-speed video camera for visualization of free surface, a contact-type liquid level sensor and a laser probe method for measurement of amplitude of free-surface waves, etc. We have succeeded in understanding the flow characteristics of the Li wall jet by measuring them. The diagnostics we developed are applicable to other LM free-surface flows, and the flow characteristics we obtained are valuable as fundamental data for other LM flows.

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