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Fleurence, A.*; Lee, C.-C.*; Friedlein, R.*; Fukaya, Yuki; Yoshimoto, Shinya*; Mukai, Kozo*; Yamane, Hiroyuki*; Kosugi, Nobuhiro*; Yoshinobu, Jun*; Ozaki, Taisuke*; et al.
Physical Review B, 102(20), p.201102_1 - 201102_6, 2020/11
Times Cited Count：2 Percentile：12.9(Materials Science, Multidisciplinary)no abstracts in English
Ebara, Shinji*; Takamura, Hiroyuki*; Hashizume, Hidetoshi*; Yamano, Hidemasa
International Journal of Hydrogen Energy, 41(17), p.7139 - 7145, 2016/05
Times Cited Count：7 Percentile：18.31(Chemistry, Physical)In this study, a flow visualization and pressure measurement were conducted by using an experimental setup including test sections of 1/7-scale models of the cold-leg piping of Japan sodium-cooled reactor with high Reynolds number region up to about one million. Regarding the flow field, flow separation appeared in the intrados of the third elbow. However, the separation region was smaller than that observed in the first elbow in the direction normal to the mean flow and was larger in the streamwise direction. This can be considered because of the swirling flow generated downstream of the second elbow which flowed into the third elbow with a little reduction. From the pressure fluctuation test, it was found that prominent frequencies of the pressure fluctuation appeared at about 0.4 in Strouhal number, which corresponds to a nondimensional frequency, in the region from 0 D to 0.4 D downstream of the elbow outlet, where D is the diameter of the piping. And weak peaks of about 0.7 in Strouhal number were observed in the region far 0.75 D downstream of the outlet.
Ebara, Shinji*; Takamura, Hiroyuki*; Hashizume, Hidetoshi*; Yamano, Hidemasa
Proceedings of 17th International Conference on Emerging Nuclear Energy Systems (ICENES 2015) (CD-ROM), 6 Pages, 2015/10
In this study, a flow visualization and pressure measurement were conducted by using an experimental setup including test sections of 1/7-scale models of the cold-leg piping of Japan sodium-cooled reactor with high Reynolds number region up to about one million. Regarding the flow field, flow separation appeared in the intrados of the third elbow. However, the separation region was smaller than that observed in the first elbow in the direction normal to the mean flow and was larger in the streamwise direction. This can be considered because of the swirling flow generated downstream of the second elbow which flowed into the third elbow with a little reduction. From the pressure fluctuation test, it was found that prominent frequencies of the pressure fluctuation appeared at about 0.4 in Strouhal number, which corresponds to a nondimensional frequency, in the region from 0 D to 0.4 D downstream of the elbow outlet, where D is the diameter of the piping. And weak peaks of about 0.7 in Strouhal number were observed in the region far 0.75 D downstream of the outlet.
Takamura, Hiroyuki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Aizawa, Kosuke; Yamano, Hidemasa
Journal of Fluids Engineering, 134(10), p.101201_1 - 101201_8, 2012/10
Times Cited Count：31 Percentile：77.69(Engineering, Mechanical)By means of 2D PIV (2-dimensional Particle Image Velocimetry), flow visualization experiments are carried out for a single short elbow piping which is a 1/7-scale model of the cold-leg piping of Japan Sodium-cooled Fast Reactor in order to investigate the minute flow field related especially to flow separation appearing in the intrados side of the elbow and frequency characteristics of the flow velocity fluctuation for various Reynolds number flow. A periodic motion with St of 0.5 appeared near the separation region if the Reynolds number changes.
Takamura, Hiroyuki*; Ebara, Shinji*; Kaneko, Tetsuya; Yamano, Hidemasa; Hashizume, Hidetoshi*
Proceedings of 15th International Symposium on Flow Visualization (ISFV-15) (CD-ROM), 10 Pages, 2012/06
Flow visualization experiment with 2D-PIV in a dual elbow system simulating the cold-leg piping of the JSFR was performed varying Reynolds number from 0.3
10
to 1.010. The tested piping has two short elbows which are three-dimensionally connected with a straight pipe. In the dual elbow system, separation vortices are shed from the separated region like a single elbow one. These vortices flow by the inrados of the second elbow and its lower stream. The post-critical regime of the dual elbow flow appears when Reynolds number is larger than about 0.510, as with the single elbow system.
Takamura, Hiroyuki*; Konno, Hiroaki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Aizawa, Kosuke; Yamano, Hidemasa
Proceedings of 9th International Symposium on Particle Image Velocimetry (PIV '11) (USB Flash Drive), 6 Pages, 2011/07
Takamura, Shuichi*; Kado, Shinichiro*; Fujii, Takashi*; Fujiyama, Hiroshi*; Takabe, Hideaki*; Adachi, Kazuo*; Morimiya, Osamu*; Fujimori, Naoji*; Watanabe, Takayuki*; Hayashi, Yasuaki*; et al.
Kara Zukai, Purazuma Enerugi No Subete, P. 164, 2007/03
no abstracts in English
Shimada, Michiya; Hosogane, Nobuyuki; Itami, Kiyoshi; Takamura, Shuichi*; Oyabu, Nobuyoshi*; Tawara, Hiroyuki*; Hatayama, Akiyoshi*
Purazuma, Kaku Yugo Gakkai-Shi, 76(1), p.41 - 63, 2000/01
no abstracts in English
Takamura, Hiroyuki*; Konno, Hiroaki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Aizawa, Kosuke; Yamano, Hidemasa
no journal, ,
no abstracts in English
Konno, Hiroaki*; Takamura, Hiroyuki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Aizawa, Kosuke; Yamano, Hidemasa
no journal, ,
no abstracts in English
Konno, Hiroaki*; Takamura, Hiroyuki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Aizawa, Kosuke; Yamano, Hidemasa
no journal, ,
no abstracts in English
Takamura, Hiroyuki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Aizawa, Kosuke; Yamano, Hidemasa
no journal, ,
no abstracts in English
Takamura, Hiroyuki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Yamano, Hidemasa
no journal, ,
In this study, dual elbow under high Reynolds number condition was experimented by two-dimensional PIV measurement simulating the primary cold leg piping of JSFR characterized by the low curvature ratio tremble elbow structure to compare single elbow flow with the dual elbow to study multiple-elbow effect.
Takamura, Hiroyuki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Yamano, Hidemasa
no journal, ,
Cold leg piping of primary cooling system in Japan Sodium-Cooled Fast Reactor (JSFR) is expected to have big pressure fluctuation with suppression from complex turbulent flow field formation caused by the high Reynolds and three-dimensional continuous triple elbow structure. Comprehending three-dimensional flow structure is needed to evaluate this pressure fluctuation by this flow-induced oscillation. Two-dimensional PIV and pressure fluctuation in the Re number up to couple of hundreds range have been measured and the data has been acquired and evaluated in single and dual elbow system in 1/7-scale Model. In this study, PIV is measured in triple elbow system is measured and flow field in cold leg piping is evaluated with the past knowledge.
Mizutani, Jun*; Takamura, Hiroyuki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Yamano, Hidemasa
no journal, ,
In cold leg piping of primary cooling system of Japan Sodium-cooled Fast Reactor (JSFR), high Reynolds (Re) number and three dimensional arrangement of 3 elbow structure forms complex turbulent flow field, and pressure fluctuation induced by separation vortex release is postulated. inhibition of the separation is considered to lower the pressure fluctuation and changing inflow condition indicated possibility of inhibiting pressure fluctuation. In this study, 1/7 scale flow testing device simulating JSFR primary cold-leg piping was used to study conditions to reduce separation.
Takamura, Hiroyuki*; Ebara, Shinji*; Hashizume, Hidetoshi*; Yamano, Hidemasa
no journal, ,
In this study, pressure fluctuation experiment in three elbow system, which has never been done, was implemented to evaluate pressure fluctuation behavior in cold leg piping based on the knowledge already obtained.
