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Ariyoshi, Gen; Obayashi, Hironari; Saito, Shigeru; Sasa, Toshinobu
Proceedings of 19th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-19) (Internet), 10 Pages, 2022/03
To clarify the flow characteristics of heavy liquid-metal (HLM) is important to achieve the construction of nuclear transmutation facility that utilizes HLM as a spallation target and coolant. At present, lead-bismuth eutectic (LBE) spallation target plans to be installed in Japan proton accelerator research complex (J-PARC). LBE is also selected as one of the candidate media of a spallation target and a coolant for innovative nuclear systems such as accelerator-driven system (ADS) and LBE-cooled fast reactor, due to its adequate physical/chemical properties. The characteristics of LBE flowing inside the target are usually clarified with computational fluid dynamics analysis since the measurement techniques for the HLM flow are not well established, especially for high temperature region over 450
C that is delivered from ADS's criteria. Therefore, the objective of this study is to develop measurement method for flow characteristics in the high temperature LBE. A miniature electro-magnet is introduced to electro-magnetic probe to overcome the limitation caused by a curie temperature of permanent magnet. To evaluate performance of the new probe, experimental apparatus equipping annular rotating vessel were also manufactured. The new probe was applied to high temperature LBE up to 480C. As a result, proportional induced voltage to the rotation speed of LBE were clearly observed, where excitation currents of the miniature electro-magnet were 0.2 A or 1 A. In this paper, configuration and performance of the newly developed electro-magnet probe to the high temperature LBE will be presented.
Kimura, Nobuyuki; ; ; ; Kamide, Hideki; Tokuhiro, Akira; Hishida, Koichi
JNC TN9400 2000-057, 60 Pages, 2000/05
JNC-TN9400-2000-057.pdf:2.11MB
ln experimental study for the thermohydraulics of fast reactor, a simple experiment with fine measurement has been desired for understanding of phenomena and for verification of computer code rather than mockup experiments of large scale. For such purposes quality of experimental data must be improved. ln the velocity measurement, instantaneous velocity profile will have great advances for the understanding of phenomena and for the verification of computer code. ln this report two methods of the velocity profile measurement are discussed; one is ultrasound Doppler velocimetry (UDV) and the other is particle image velocimetry (PIV). These methods were applied to water experiments. The UDV was applied to pipe flow, planer jet, and the inter-wrapper flow which is seen in the gap region between subassemblies of fast reactor core. Cross check with laser Doppler velocimetly showed proper measurement of the UDV. Problems including the application to sodium experiments are also discussed. The PIV was also applied to the inter-wrapper flow. For the application to complex flow geometry, noise reduction method was developed to improve the measurement accuracy.
Kimura, Nobuyuki; Tokuhiro, Akira; Kamide, Hideki
JNC TN9400 2000-027, 181 Pages, 2000/02
JNC-TN9400-2000-027.pdf:10.28MB
A quantitative evaluation on thermal striping, in which temperature fluctuation due to convective mixing among jets causes thermal fatigue in structural components, is of importance for reactor safety. ln this study, a water experiment was performed using vertical and parallel triple jets, those are cold jet on center and hot jets on both side. The experimental parameter was discharged velocity of the triple-jet and local temperature and velocity were measured by ultrasound Doppler velocimetry and movable thermocouples. The objective is a quantification of the mixing process in the multiple-jet. Under isovelocity condition, the jets oscillated periodically and mixing among thejets was promoted by periodic oscillation. The periodic oscillation was dependent on the Strouhal number based on the discharged velocity. Under non-isovelocity condition, on the other hand, the jets did not oscillate periodically and mixing among the jets progressed more gentle compared with the case under isovelocity condition. The tempwrature fluctuation could be decomposed into coherent and random components using the phase averaging process. The rate of the coherent component in the temperature fluctuation increased and the rate of random component in temperature fluctuation decreased in proportion as the discharged velocity was increased.
Fumizawa, Motoo
Nuclear Technology, 109, p.236 - 245, 1995/02
Times Cited Count：4 Percentile：43.23(Nuclear Science & Technology)no abstracts in English
Fumizawa, Motoo; Hishida, Makoto
Laser Anemometry 1995 (FED-Vol. 229), 0, p.51 - 56, 1995/00
no abstracts in English
Akino, Norio; Takase, Kazuyuki; Kubo, Shinji; Hino, Ryutaro
Dai-26-Kai Ranryu Shimpojiumu Koen Rombunshu 1994, 0, p.176 - 179, 1994/00
no abstracts in English
*; *; *; Fumizawa, Motoo
Kashika Joho Gakkai-Shi, 13(SUPPL.1), p.261 - 264, 1993/07
no abstracts in English
Fumizawa, Motoo
Kashika Joho Gakkai-Shi, 13(SUPPL.1), p.253 - 256, 1993/07
no abstracts in English
*; *; Akiyama, Mamoru*; Fumizawa, Motoo
Proc. of the 2nd ASME/JSME Nuclear Engineering, p.151 - 156, 1993/00
no abstracts in English
*; *; Fumizawa, Motoo
Kashika Joho Gakkai-Shi, 12(SUPPL.1), p.135 - 138, 1992/07
no abstracts in English
Fumizawa, Motoo; Hishida, Makoto; Inagaki, Yoshiyuki
Proc. of the 5th Int. Topical Meeting on Reactor Thermal Hydraulics, p.369 - 376, 1992/00
no abstracts in English
Fumizawa, Motoo; Hishida, Makoto; Takase, Kazuyuki
Thermal Hydraulics of Severe Accidents, p.63 - 68, 1992/00
no abstracts in English
Fumizawa, Motoo; Hishida, Makoto
JAERI-M 91-146, 27 Pages, 1991/09
no abstracts in English
; Yamamoto, Tadatoshi
Oyo Butsuri, 52(3), p.268 - 273, 1983/00
no abstracts in English
Okamoto, Yoshizo; *
JAERI 1142, 13 Pages, 1967/09
no abstracts in English
Kawamura, Hideyuki; Hirose, Naoki*; Nakayama, Tomoharu*; Ito, Toshimichi
no journal, ,
We developed ocean current data measured by an Acoustic Doppler Current Profiler attached on a ferryboat across the Tsugaru Strait from October 1999 to January 2008 in this study. It is useful to understand the characteristics of the ocean current in the Tsugaru Strait for predicting oceanic dispersion of radioactive materials released from nuclear facilities around the strait and for understanding the mechanism of the Tsugaru Warm Current. The database cosists of 2,211 daily data files from October 1999 to January 2008. The data files record the components of the current speed in the east-west and north-south directions, quafifying flags and so on. The ocean current data was frequently acquired in summer compared with winter. The strong eastward ocean current corresponding to the Tsugaru Warm Current was confirmed by analyzing the ocean current data. We expect that the database will be used by many users for oceanographical study.
