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Tanigawa, Hiroyasu; Ozawa, Kazumi; Morisada, Yoshiaki*; Noh, S.*; Fujii, Hidetoshi*
Fusion Engineering and Design, 98-99, p.2080 - 2084, 2015/10
Times Cited Count：10 Percentile：64.63(Nuclear Science & Technology)The vacuum plasma spray (VPS) technique has been investigated as the most practical method to form Tungsten (W) layer as a plasma facing material in fusion devices. The issues are the thermal conductivity and the strength of VPS-W, i.e., the thermal conductivity of VPS-W were significantly lower than that of the bulk W, and the hardness of VPS-W is much less than that of the bulk W. These are mainly caused by the porous structure of VPS-W. In order to solve these issues, friction stir processing (FPS) was applied on VPS-W in this study. It was suggested that FSP can contribute to significant improvement both in mechanical and thermal properties of VPS-W coating.
Takase, Kazuyuki; Yoshida, Hiroyuki; Ose, Yasuo*; Kureta, Masatoshi; Tamai, Hidesada; Akimoto, Hajime
Proceedings of 5th International Conference on Multiphase Flow (ICMF 2004) (CD-ROM), 14 Pages, 2004/06
no abstracts in English
Tamai, Hidesada; Kureta, Masatoshi; Yoshida, Hiroyuki; Akimoto, Hajime
JSME International Journal, Series B, 47(2), p.293 - 298, 2004/05
no abstracts in English
Asakura, Nobuyuki; Shimizu, Katsuhiro; Nakano, Tomohide; Higashijima, Satoru; Kubo, Hirotaka; Takenaga, Hidenobu
Proceedings of 30th EPS Conference on Controlled Fusion and Plasma Physics (CD-ROM), 4 Pages, 2003/00
The measurements of the parallel SOL flow (Mach number, M) and electric field (Er) both at the high-field-side (HFS) and low-field-side (LFS) have been accomplished using Mach probes in JT-60U. Particle fluxes towards the HFS and LFS divertors produced by the parallel SOL flow (niMCs) and ErxB drift flow (niEr/B) were evaluated. For the case of intense gas puffing from the plasma top (puff and pump), Zeff was reduced largely to 1.3, comparing to 1.42 for the divertor gas puff. It was found that both M and ni in niMCs were enhanced, in particular, at HFS. On the other hand, niEr/B for the two cases were comparable since ni increased and Er decreased for the puff and pump. Friction force and thermal force on impurity ions were estimated from the measured M, ne, Te and Ti, and ratios of Ffric/Fi-therm at HFS increased to 3-4 compared to 1.5-1.8 for the divertor gas puff. This result was consistent with a conventional model of reduction in Zeff. Two-dimensional transport of the carbon impurity at the HFS and LFS divertors was discussed using IMPMC (Impurity Monte-Carlo) code.
Takeda, Tetsuaki
Nihon Kikai Gakkai Dai-8-Kai Doryoku, Enerugi Gijutsu Shimpojiumu Koen Rombunshu, p.199 - 202, 2002/00
There are several methods for enhancement of heat transfer such as attaching various type fins on a channel surface of a heat exchanger tube and a steam reforming tube. The objective of this study is to clarify characteristics of heat transfer and pressure drop in the channel inserted metallic wire with high porosity. A heat transfer experiment was performed using a horizontal circular tube to obtain the heat transfer characteristics of the channel inserted copper wire. From the results obtained in this experiment, it seems to be probable that an enhancement of heat transfer method using metallic wire inserts is further improved under the high temperature conditions in efficiency as compared with the other methods.
Akino, Norio
Haiteku Shimpojium Yamaguchi 2001 Teiko Gensho Seigyo Shimpojium Rombunshu, p.37 - 43, 2001/11
no abstracts in English
Shibamoto, Yasuteru; Yonomoto, Taisuke; Anoda, Yoshinari; Kukita, Yutaka*
Nuclear Engineering and Design, 201(1), p.83 - 98, 2000/09
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)no abstracts in English
Tsuchiya, Kunihiko; Nakamichi, Masaru; Kawamura, Hiroshi
Effects of Radiation on Materials (ASTM STP 1366), p.988 - 999, 2000/00
no abstracts in English
Akino, Norio; Kubo, Shinji; Takase, Kazuyuki; Hino, Ryutaro; Choi, K.*
Nihon Kikai Gakkai Ryutai Kogaku Bumon Koenkai 2000 Koen Rombunshu (CD-ROM), 4 Pages, 2000/00
no abstracts in English
; Miura, Akihiko; ;
JNC TN8410 99-043, 135 Pages, 1999/10
All result of chemical analysis and operators observation suggest non-chemical mechanism raised the filling temperature of the bituminized product at the incident. We, Tokai reprocessing plant safety evaluation and analysis team, performed the experiment using laboratory scale extruder and viscosity measurement to explain the high temperature of mixture. The result of the experiment using laboratory scale extruder showed that the phenomena of salt enrichment and salt accumulation oceured and they raised mixture temperature at the decreased feeed rate. These phenomena depend on the feed rate and they have large contribution of heat transportation and rise of operational torque due to the friction between screw and mixture. Based on the experiment result and all information, we investigated the operation procedure, operational records and machine arrangement to try to explain the behavior of the mixture in the extruder. Judging from each torque and temperature behavior, we succeeded in explaining a sequential behavior in the incident. It is estimated that mixture temperature was raised by physical heat generation in the extruder and this report explains each operation, investigated result and estimated event sequences.
Shibamoto, Yasuteru; Yonomoto, Taisuke; Anoda, Yoshinari; Kukita, Yutaka*
Proceedings of 7th International Conference on Nuclear Engineering (ICONE-7) (CD-ROM), 14 Pages, 1999/00
no abstracts in English
; Kano, Shigeki
PNC TN9410 98-049, 55 Pages, 1998/03
Low speed tribological properties of stainless steel, ceramics and hard metals were investigated in air at room temperature and in nitrogen atmosphere at high temperature for the consideration of sliding type support structure in intermediate heat exchanger of fast reactor. The following results are obtained. (1)In low speed friction measurements in air at room temperature, friction coefficients of ceramics and hard metals were smaller than that of stainless steel. Surface roughness of the specimens increased the friction force and silicon carbide showed the smallest friction coefficient among the specimens with mirror polished surface. (2)From the results of friction measurements at various sliding speeds in air at room temperature, friction coefficients of ceramics and hard metals were always stable and lower than that of stainless steel. Among ceramics, PSZ showed the smallest friction and silicon carbide showed the most stable friction at any sliding speeds. (3)Friction coefficients of silicon carbide and silicon nitride in nitrogen atmosphere at high temperature showed low values as measured at room temperature. On the contrary, friction coefficient of stainless steel measured in nitrogen atmosphere at high temperature were higher than that measured at room temperature, over 1. (4)In the reciprocal sliding tests in nitrogen atmosphere at high temperature, friction coefficient of stainless steel were over 1. On the contrary, the friction coefficients of ceramics were less than 1 instead of chipping during the slidings.
CKikuchi, Kenji; H.J.Penkalla*; Nishi, Hiroshi
Nihon Kikai Gakkai Rombunshu, A, 63(613), p.2032 - 2037, 1997/09
no abstracts in English
M.S.Islam*; Hino, Ryutaro; Haga, Katsuhiro; Monde, Masanori*; Sudo, Yukio
JAERI-Tech 97-032, 49 Pages, 1997/07
no abstracts in English
Takase, Kazuyuki
Nuclear Technology, 118(2), p.175 - 185, 1997/05
Times Cited Count：5 Percentile：42.84(Nuclear Science & Technology)no abstracts in English
M.S.Islam*; Hino, Ryutaro; Haga, Katsuhiro; Monde, Masanori*; Sudo, Yukio
JAERI-Tech 97-008, 46 Pages, 1997/03
no abstracts in English
Takase, Kazuyuki
Experimental Thermal and Fluid Science, 13(2), p.142 - 151, 1996/08
Times Cited Count：8 Percentile：49.95(Thermodynamics)no abstracts in English
Takase, Kazuyuki; Akino, Norio
JAERI-Research 96-031, 24 Pages, 1996/06
JAERI-Research-96-031.pdf:0.94MB
no abstracts in English
H.J.Penkalla*; Kikuchi, Kenji
Nihon Kikai Gakkai Rombunshu, A, 62(593), p.162 - 167, 1996/01
no abstracts in English
Tsuchiya, Kunihiko; Kawamura, Hiroshi;
Fusion Technology, 2, p.1399 - 1402, 1996/00
no abstracts in English
