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Title
Japanese: 
English:Heat-pulse flow meter for liquid breeders 
Author
Japanese: 近藤正聡, 柴野 恭平.  
English: Masatoshi Kondo, Kyohei Shibano.  
Language English 
Journal/Book name
Japanese: 
English:Plasma and Fusion Research and Nuclear Fusion Research 
Volume, Number, Page Vol. 8        pp. 1-6
Published date Mar. 19, 2013 
Publisher
Japanese:プラズマ核融合学会 
English:The Japan Society of Plasma Science 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Abstract Liquid metals Li, Pb-17Li and Sn-20Li are candidate liquid breeders in fusion reactors. The development of a flowmeter that can be applied to high-temperature liquid metals is an important issue. A heat-pulse flowmeter is proposed in the present study. Its basic performance was investigated by means of a loop experiment with Pb-17Li and a numerical simulation. The temperature distribution in flowing Pb-17Li was obtained by local transient heating of the outer surface of a loop tube. The temperature distribution gradually changed and resembled the movement of a hot spot, which had a higher temperature than its surroundings. This hot spot moved along the flow and passed through the tips of the thermocouples. The change in temperature distribution with the movement of the hot spot was monitored by three thermocouples exposed to the Pb-17Li flow. The results of the loop experiments were numerically simulated by assuming a certain flow rate, and the temperature profile obtained in the loop experiment was in agreement with the simulation results. The time taken by the hot spot to pass through the tips of the thermocouples was measured and simulated, and the correlation between this time and the average flow velocity was evaluated. The results indicated the average flow velocity can be obtained using the heat-pulse flowmeter proposed in this study.

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