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Horiguchi, Naoki; Yoshida, Hiroyuki; Kaneko, Akiko*; Abe, Yutaka*
Nihon Kikai Gakkai Kanto Shibu Dai-29-Ki Sokai, Koenkai Koen Rombunshu (Internet), 5 Pages, 2023/10
To elucidate the behavior of molten fuels as a liquid jet in a shallow pool, which is assumed in a core meltdown accident of an LWR, and develop the evaluation method, we investigated the behavior of the vortical liquid film of the simulated wall-impinging liquid jet using 3-dimensional interface shape data obtained by the experiment in a liquid-liquid system.
Horiguchi, Naoki; Yoshida, Hiroyuki; Kaneko, Akiko*; Abe, Yutaka*
Physics of Fluids, 35(7), p.073309_1 - 073309_17, 2023/07
Times Cited Count：0 Percentile：0.01(Mechanics)The atomization of a liquid jet in an immiscible liquid-liquid system is significant for the safety in the nuclear industry field. The Japan Atomic Energy Agency has developed an evaluation method of a melt fuel behavior as a liquid jet in an immiscible liquid-liquid system for subsequence using mechanistic numerical simulation and has investigated liquid jet behavior in a shallow pool through numerical simulations and experiments. The paper clarifies the atomization mechanism in the wall-impinging liquid jet. Herein, the atomization behavior in the wall-impinging liquid jet in a shallow pool in an immiscible liquid-liquid system was studied in terms of droplet formation and flow field using numerical simulation and the dispersed-phase tracking method. The results show that the droplet formation in the liquid film flow of the wall-impinging liquid jet had the three patterns, and we obtained the droplet properties immediately after droplet formation and developed the theoretical criterion regions using the dimensionless numbers for droplet formation. We characterized the patterns by comparing them with the regions and elucidated the droplet formation mechanisms depending on their sources. Moreover, we elucidated that the relationship between droplet formation as the local behaviors of the jet and atomization as the whole behavior.
Yoshida, Hiroyuki; Kimura, Fumihito*; Suzuki, Takayuki*; Kaneko, Akiko*; Abe, Yutaka*
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Kimura, Fumihito*; Yoshida, Hiroyuki; Kaneko, Akiko*; Abe, Yutaka*
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Yoshida, Hiroyuki; Kimura, Fumihito*; Suzuki, Takayuki*; Kaneko, Akiko*; Abe, Yutaka*
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Yoshida, Hiroyuki; Horiguchi, Naoki; Suzuki, Takayuki*; Yamamura, Sota*; Abe, Yutaka*
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Horiguchi, Naoki; Yamamura, Sota*; Fujiwara, Kota*; Kaneko, Akiko*; Yoshida, Hiroyuki
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Horiguchi, Naoki; Kaneko, Akiko*; Yoshida, Hiroyuki; Abe, Yutaka*
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In terms of improving the safety of LWRs, it is important to reproduce and evaluate the behavior of the melting core as a liquid jet when it falls into a shallow pool during the severe accident. JAEA has developed numerical simulation codes that can reproduce the behavior and has conducted experiments by using the 3D-LIF method for the validation. As a part of the experiment, we have investigated the effect of the liquid film structure on fragmentation amount based on the observation result of the changes of fragments amount and the structure. In this work, we estimated fragmentation time of the individual fragments by using the experimental data, calculated volume of fragments at the time and estimated fragmentation amount.
Horiguchi, Naoki; Yoshida, Hiroyuki; Kaneko, Akiko*; Abe, Yutaka*
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no abstracts in English
Masaki, Naoto*; Horiguchi, Naoki; Kaneko, Akiko*; Yoshida, Hiroyuki
no journal, ,
no abstracts in English
