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Horiguchi, Naoki; Yoshida, Hiroyuki; Kaneko, Akiko*; Abe, Yutaka*
no journal, ,
JAEA has developed the evaluation method of a wall-impinging liquid jet in a shallow pool in a liquid-liquid system by numerical simulation. As a part of the development, to clarify the generation mechanism of the fragments, we identified the primary generation position of the fragments by post-processing the 3-dimensional interface shape data of the liquid jet using the 3D-LIF method and investigated the relationship between the generation position and the liquid film structure of the jet.
Ito, Kei*; Ito, Daisuke*; Odaira, Naoya*; Saito, Yasushi*; Song, K.*; Ezure, Toshiki; Matsushita, Kentaro; Tanaka, Masaaki
no journal, ,
The entrained gas flow rate by a bathtub vortex must be evaluated to achieve stable operation of a sodium-cooled fast reactor. In this study, a simple vortex-type gas entrainment experiment is conducted to evaluated the entrained gas flow rate under various conditions of free surface level, downstream pressure and suction pipe diameter. As a result, it is clarified that the entrained gas flow rate increases with the decrease in the downstream pressure. Based on the experimental result, we model the annular two-phase flow in the suction pipe and propose a new evaluation model of the entrained gas flow rate in which the influence of the downstream pressure.
Ariyoshi, Gen; Ito, Kei*; Kogawa, Hiroyuki; Futakawa, Masatoshi
no journal, ,
Cavitation damage caused by pressure waves is one of the important issues which threaten the integrity of the mercury spallation target vessel in J-PARC. To mitigate the damage, technology using mercury-helium two-phase flow has been developed. Although effective bubble radius for absorption/attenuation of the waves is evaluated as less than 0.1 mm, actual bubble radius might be different from the evaluated one due to microbubble coalescence phenomena. Therefore, the purpose of present study is to clarify and predict the bubble radius distribution in the target. To achieve that, visualization of microbubble coalescence phenomena was performed by using air-water two-phase flow as a model flow. Obtained experimental results and numerical prediction code presently developed will be explained.
Kiyohara, Keita*; Murakawa, Hideki*; Sugimoto, Katsumi*; Kubo, Yohei*; Kurita, Keisuke; Iikura, Hiroshi; Asano, Hitoshi*
no journal, ,
Boiling two-phase flows in mini-channel cross-flow vaporizer had been visualized by two methods, neutron radiography and the method by replacing the outer wall with a transparent wall.