2024-03-28T18:13:52Z
https://tsukuba.repo.nii.ac.jp/oai
oai:tsukuba.repo.nii.ac.jp:00041872
2022-04-27T09:12:51Z
29:836
3:62:5596:6001
Flow transition criteria of a liquid jet into a liquid pool
阿部, 豊
Saito, Shimpei
Abe, Yutaka
Koyama, Kazuya
© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
To better understand the fundamental interactions between melt jet and coolant during a core-disruptive accident at a sodium-cooled fast reactor, the jet breakup and droplet formation in immiscible liquid-liquid systems were studied experimentally. Experiments using two different pairs of test fluids were carried out at isothermal conditions. The observed jet breakup behavior was classified into characteristic regimes based on the classical Ohnesorge classification in liquid-gas systems. The variation in breakup length obtained in the present liquid-liquid system was similar to that in a liquid-gas system. The droplet size distribution in each breakup regime was analyzed using image processing and droplet formation via pinch-off, satellite formation, and entrainment was observed. The measured droplet size was compared with those available from melt jet experiments. Based on the observation and analysis results, the breakup regimes were organized on a dimensionless operating diagram, with the derived correlations representing the criteria for regime boundaries of a liquid-liquid system. Finally, the experimental data were extrapolated to the expected conditions of a sodium-cooled fast reactor. From this, it was implied that most of the hydrodynamic conditions during an accident would be close to the atomization regime, in which entrainment is the dominant process for droplet formation.
Elsevier
2017-04
eng
journal article
http://hdl.handle.net/2241/00146809
https://tsukuba.repo.nii.ac.jp/records/41872
10.1016/j.nucengdes.2017.02.011
0029-5493
AA00759849
Nuclear engineering and design
315
128
143
https://tsukuba.repo.nii.ac.jp/record/41872/files/NED_315.pdf
application/pdf
2.2 MB
2019-05-01