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Watanabe, Tadashi; Kondo, Masaya
JSME International Journal, Series B, 49(2), p.296 - 301, 2006/05
no abstracts in English
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.
superconductor by high-energy heavy ion irradiationSasase, Masato; Okayasu, Satoru; Kurata, Hiroki; Hojo, Kiichi
Journal of Electron Microscopy, 51(Supple), p.S235 - S238, 2002/00
no abstracts in English
Sasase, Masato; Okayasu, Satoru; Kurata, Hiroki; Hojo, Kiichi
Physica C, 357-360(Part.1), p.497 - 500, 2001/09
no abstracts in English
Okayasu, Satoru; Sasase, Masato; Kuroda, N.; Iwase, Akihiro; Kazumata, Yukio*; Kambara, Tadashi*
Physica C, 357-360(Part.1), p.501 - 504, 2001/09
no abstracts in English
Hama, Katsuhiro; Mitsui, Seiichiro; Aoki, Rieko*; Hirose, Ikuro
JNC TN7430 2000-001, 47 Pages, 2000/12
JNC-TN7430-2000-001.pdf:4.09MB
Long-term immersion tests of glass material at ambient temperature (about 18 
C) for 10 years were performed in a gallery at the Tono mine in Japan, in order to assess durability of glass matelial contacted with natural groundwater. The gallery was constructed at a depth of 130 m below ground surface in the Toki Granite. Monolithic glass blocks with dimensions of 10 
10 10 mm (cubic type) and of 25 mm in diameter and 8 mm in thickness (disk type: The wall of sample was covered by stainless steel of 1 mm thick.) were used for the tests. Both type of samples with and without clay were put in Teflon vessels, which have small holes on the wall, and inserted into boreholes excavated at the gallery floor. In addition to the immersion tests, static leaching test with cubic type glass and ground water was also performed at the gallery. The samples of each test were collected in time intervals of 6 months, 1 year, 2 years, 3 years and 10 years and were subjected to weight loss measurement and several surface analyses. The results were as follows: (1)Weight losses of each sample were proportional to time intervals. This result is attributable to constant dissolved silica concentration in the ground water during tests. (2)The weight losses of disk type glass were slightly larger than those of cubic type glass. This result is attributable to elemental release from internal cracks of disk type glass, instead of effect of stainless steel on the glass dissolution. (3)The weight losses for the tests with clay were slightly smaller than those for tests without clay. This result is attributable to higher concentration of dissolved silica in pore water of clay.
Sakai, Takaaki; ; ;
JNC TN9400 2000-012, 43 Pages, 2000/03
JNC-TN9400-2000-012.pdf:2.12MB
Experimental validation of the design method to prevent the failure of a thermometer well by the vortex-induced vibration has been performed for the effect of structure damping of a cylinder. The available experimental data in piping were very limited for the high damping region in water flow, because of the difficulty to increase the structure dumping for the one-side supported cylinder in experiments. ln this experiment, high viscosity fluid was charged into the tested cylinders to control the cylinder's damping. Resulting values of the reduced damping are 0.49, 0.96, 1.23, 1.98, 2.22 in the experiments. Reduced velocity(Vr) was increased gradually in the range of 0.7 
Vr 5(Reynolds number at Vr=1 is 810
). The displacements of the cylinder by the vortex-induced vibration were measured. As the results, Tested cylinders of reduced damping 0.49 and 0.96 showed vortex-induced vibration in flow direction at Vr 
1 region. However, in case of reduced damping of 1.23, 1.98 and 2.22, the vortex-induced vibrations in flow direction were suppressed lower than the 1% displacement of the cylinder diameter. ln conclusion, it is confirmed that the suppression criteria of the "Vr 
3.3 and Cn 1.2" for vortex-induced vibration in flow direction, which is used in ASME code; "Boiler and Pressure VesseI Code Sec.III Appendix N-1300" and the "FIV design guide in JNC", is reasonably applicable to the one-side supported cylinder in water flow piping.
superconductor by high-energy heavy ion irradiationSasase, Masato; Sato, Takahiro*; Okayasu, Satoru; Kurata, Hiroki; Hojo, Kiichi
Advances in Superconductivity XII, p.314 - 316, 2000/00
no abstracts in English
Kubo, Shinji; Akino, Norio
Transactions of the American Nuclear Society, 81, p.352 - 353, 1999/11
no abstracts in English
Okayasu, Satoru; Kuroda, N.*; Iwase, Akihiro; Kambara, Tadashi*
Advances in Superconductivity XI, p.287 - 290, 1999/00
no abstracts in English
SrCaCuOy containing columnar defects*; Hanaguri, T.*; *; Maeda, A.*; Sasase, Masato; Hojo, Kiichi; Steel, D. G.*; Lee, J. U.*; Hofman, D. J.*
Physical Review B, 59(17), p.11568 - 11574, 1999/00
Times Cited Count：8 Percentile：45.66(Materials Science, Multidisciplinary)no abstracts in English
;
PNC TN9410 96-276, 49 Pages, 1996/09
Fluid flow in circular tube is the most frequently encountered in engineering fields related to thermal hydraulics. The fluid flow in straight tube has been investigated with many experiments and analyses in laminar and turbulence conditions with sufficient accuracy. In the design of plant piping, there are many contract and enlargement of flow area as well as elbows and junctions. Such a complexity of industrial piping requires fine mesh and long simulation time for the analyses of the flow. To evaluate the applicability of the AQUA code for flow analyses in an industrial piping, analyses for convection around submerged a cylinder, secondary flow with elbows and flow in a sudden contract were carried out. With the analysis of flow field around a submerged cylinder, drag force acting on the cylinder was evaluated from the numerical simulation with AQUA code. The drag force was agreed with the results using equation of drag coefficient depends on measured data in case of small friction of submerged cylinder and narrow separation region of the cylinder. In the analysis of the secondary flow with three elbows, AQUA code simulates the characteristics of secondary flow. The results showed that the secondary flow almost disappeared at point at 30d (d; diameter of pipe) distance from the elbow. The flow in a sudden contract was simulated. Ratio of the cross sectional area for pipe to the area for vessel is 0.2. In this case, effect of the contract to velocity distribution is small at the position that from inlet of the pipe to two times of the diameter in the downstream.
*; *; Akino, Norio; Takase, Kazuyuki; Kubo, Shinji
Kashika Joho Gakkai-Shi, 15(SUPPL.1), p.241 - 244, 1995/07
no abstracts in English
*; *; Takase, Kazuyuki; Akino, Norio
Album of Visualization,No. 11, 0, p.1 - 2, 1994/00
no abstracts in English
Akino, Norio; Takase, Kazuyuki; *; *
Proc. of the 3rd Asian Symp. on Visualization:ASV 94,E32, 0, p.537 - 542, 1994/00
no abstracts in English
Miyoshi, Yoshinori; Yanagisawa, Hiroshi; Hirose, Hideyuki; Nakajima, Ken; Aoki, Isao; Suzaki, Takenori
JAERI-M 92-158, 22 Pages, 1992/11
no abstracts in English
Ogawa, Masuro
Int.J.Heat Mass Transfer, 30(5), p.1017 - 1026, 1987/05
Times Cited Count：5 Percentile：52.65(Thermodynamics)no abstracts in English
Ogawa, Masuro
Nihon Kikai Gakkai Rombunshu, B, 53(488), p.1351 - 1359, 1987/00
no abstracts in English
;
JAERI-M 86-095, 14 Pages, 1986/07
no abstracts in English
JAERI-M 85-155, 24 Pages, 1985/10
no abstracts in English
