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Kurihara, Akikazu; Ohshima, Hiroyuki; Monde, Masanori*
Heat Transfer-Asian Research, 39(8), p.628 - 633, 2010/12
To predict sodium-water reaction (SWR) of steam generator (SG) in fast breeder reactor with high accuracy, it is very important to understand the characteristics of heat transfer inside the tube in detail during tube failure due to SWR. Test tube was heated rapidly by high frequency current. Time averaged heat flux was estimated by using an inverse solution. It was confirmed that the derived values agreed with measured heat fluxes on the outer surface within 20% accuracy. It was found that the characteristics of heat transfer strongly depend on the flow rate. Heat transfer on the wall changed from nucleate to transient-film boiling during increasing heat flux and returned to nucleate boiling during decreasing the heat flux. The nucleate and film boiling coexisted and the area ratio of these varied with time in the transition boiling region. The adequacy of heat transfer correlations to evaluate overheating was confirmed.
Inaba, Yoshitomo; Zhang, Y.*; Takeda, Tetsuaki; Shiina, Yasuaki
Heat Transfer-Asian Research, 34(5), p.293 - 308, 2005/07
Water cooling panels have been adopted as the vessel cooling system of the HTTR to cool the reactor core indirectly by natural convection and thermal radiation. In order to investigate the heat transfer characteristics of high temperature gas in a vertical annular space between the reactor pressure vessel and cooling panels of the HTTR, we carried out experiments and numerical analyses on natural convection heat transfer coupled with thermal radiation heat transfer in an annulus between two vertical concentric cylinders with the inner cylinder heated and the outer cylinder cooled. In the present experiments, Rayleigh number based on the height of the annulus ranged from 2.0
10
to 5.410 for helium gas and from 1.210
to 3.510 for nitrogen gas. The numerical results were in good agreement with the experimental ones regarding the surface temperatures of the heating and cooling walls. As a result of the experiments and the numerical analyses, the heat transfer coefficient of natural convection coupled with thermal radiation was obtained.
Imai, Etsuya*; Shiina, Yasuaki; Hishida, Makoto*
Heat Transfer-Asian Research, 30(4), p.301 - 312, 2001/06
no abstracts in English
