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Uesawa, Shinichiro; Koizumi, Yasuo; Shibata, Mitsuhiko; Nagatake, Taku; Yoshida, Hiroyuki
Konsoryu, 31(2), p.162 - 170, 2017/06
no abstracts in English
Tsuji, Nobumasa*; Ohashi, Kazutaka*; Tazawa, Yujiro*; Tachibana, Yukio; Ohashi, Hirofumi; Takamatsu, Kuniyoshi
FAPIG, (190), p.20 - 24, 2015/07
In a loss of forced cooling accident, decay heat in HTGRs must be removed by radiation, thermal conduction and natural convection. Passive heat removal performance is of primary concern for enhancing inherent safety features of HTGRs. Therefore, the thermal hydraulic analyses for normal operation and a loss of forced cooling accident are conducted by using thermal hydraulic CFD code. And further, a multi-hole type fuel block of MHTGR is also modeled and the flow and heat transfer characteristics are compared with a pin-in-block type fuel block.
Shiina, Yasuaki; Inagaki, Terumi*
Nihon Kikai Gakkai Rombunshu, B, 69(681), p.1233 - 1241, 2003/05
In order to reduce phase change time in latent heat technology, improvement of effective thermal conductivity of heat storage unit would be one of the techniques. Effect of effective thermal conductivity on melting time are studied analytically of circular composite heat storage capsules made by immersing phase change materials (PCM) into porous metals. Numerical and approximate analysis were made with the consideration of uniform and non-uniform heat transfer coefficients around the cylindrical surface. Four PCMs (H
O,Octadecane, LiCO
, NaCl) and three metals (copper, aluminum and carbon steel) were selected specific materials. Porosity of the metals were restricted larger than 0.9 in order to lessen decrease in latent heat. Results show that reduction in melting time was obtained for the above PCMs, especially for low conductivity PCMs. Melting time obtained by approximate analysis agrees well with numerical analysis. High Nusselt number and high thermal conductivity of heat transfer fluid would be more effective to reduce phase change time.
Uemura, Takuya*; Takeda, Tetsuaki; Ichimiya, Koichi*
Nihon Kikai Gakkai Yamanashi Koenkai Koen Rombunshu (020-4), p.49 - 50, 2002/10
A heat transfer experiment was performed using a horizontal circular tube to obtain the heat transfer and fluid flow characteristics in the tube inserted copper wire. From the results obtained in this experiment, it was found that an amount of heat removal in the tube with copper wire inserts increased about 20% comparing with a tube having a smooth wall. A heat transfer coefficient of the tube inserted copper wire also increased 30% to 50% under the constant pumping power condition.
Kureta, Masatoshi; Akimoto, Hajime
Nihon Kikai Gakkai Rombunshu, B, 67(662), p.2550 - 2557, 2001/10
no abstracts in English
Takeda, Tetsuaki
JAERI-Research 2000-056, 27 Pages, 2000/12
JAERI-Research-2000-056.pdf:1.86MB
no abstracts in English
; Shiina, Yasuaki; Inagaki, Terumi*
Kashika Joho Gakkai-Shi, 19(75), p.41 - 45, 1999/10
no abstracts in English
Tokuhiro, Akira; Kimura, Nobuyuki
JNC TN9400 2000-015, 26 Pages, 1999/09
JNC-TN9400-2000-015.pdf:1.43MB
The quantification of the rate-of-rise of the thermal stratification interface, a "thin" vertical zone where the temperature gradient is the steepest, is important in assessing the potential implications of thermally-induced stress problems in liquid-metal cooled reactors. Thermal stratification can likewise occur in confined volumes containing ordinary fluids (Pr
1), where there is an input of thermal convective energy. In the prominent case of liquid metal reactors, there have been many studies on quantifying the rate-of-rise of a defined stratification interface, in terms of one or more of the following dimensionless groups, mainly: Richardson (Ri), Reynolds (Re), Grashof (Gr), Rayleigh (Ra) and/or Froude (Fr) numbers. Stratification is also a transient process in the volume in question. In the present work the anthors presents a derivation based on order-of-magnitude analysis (OMA), including an sensible energy balance, that produces a new representation more consistent than p
Sudo, Yukio
Nihon Kikai Gakkai Rombunshu, B, 63(609), p.179 - 185, 1997/05
no abstracts in English
Sudo, Yukio
Nihon Kikai Gakkai Rombunshu, B, 62(601), p.3376 - 3382, 1996/09
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
Shiina, Yasuaki
JAERI-Research 96-027, 33 Pages, 1996/06
JAERI-Research-96-027.pdf:1.05MB
no abstracts in English
Hishida, Makoto
J. Enhanced Heat Transfer, 3(3), p.187 - 200, 1996/00
no abstracts in English
Takase, Kazuyuki; Akino, Norio
The 3rd JSME/ASME Joint Int. Conf. on Nuclear Engineering (ICONE),Vol. 1, 0, p.535 - 540, 1995/00
no abstracts in English
Takase, Kazuyuki; Hino, Ryutaro; ; Akino, Norio
Proc. of the 10th Int. Heat Transfer Conf., Vol. 3, 0, p.245 - 250, 1994/00
no abstracts in English
Takase, Kazuyuki; Hino, Ryutaro;
Nihon Kikai Gakkai Netsu Kogaku Koenkai Koen Rombunshu, p.251 - 252, 1993/11
no abstracts in English
*; Kunugi, Tomoaki; Akino, Norio; *
Nihon Kikai Gakkai Rombunshu, B, 58(554), p.3147 - 3152, 1992/10
no abstracts in English
Hishida, Makoto; Takase, Kazuyuki
Proceedings of the ASME-JSME Thermal Engineering Joint Conference : Reno, Nevada, March 17-22, 1991, p.103 - 110, 1991/00
no abstracts in English
;
JAERI-M 84-201, 29 Pages, 1984/11
no abstracts in English
