鉛直同心二重円筒内高温気体の自然対流熱伝達に関する研究(熱工学,内燃機関,動力など)

概要

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Water cooling panels are adopted as a vessel cooling system of a High Temperature-engineering Test Reactor (HTTR) to cool the reactor core indirectly by natural convection and thermal radiation. In order to investigate heat transfer characteristics of high temperature gas in a vertical annular space between the reactor pressure vessel and the cooling panels of the HTTR, we carried out experiments and numerical analyses on natural convection heat transfer coupled with surface-to-surface thermal radiation in a vertical annular space of a double coaxial cylinder. In the present experiments, Rayleigh number based on the height of the vertical space was set to be 2.0×10^7<Ra<5.4×10^7 for helium and 1.2×10^9<Ra<3.5×10^9 for nitrogen. The numerical results were in good agreement with the experimental ones regarding the temperature on the heating and cooling walls, and so on. As a result of the experiments and the numerical analyses, a heat transfer coefficient of natural convection coupled with surface-to-surface thermal radiation was obtained as functions of Rayleigh number, radius ratio, temperature and emissivities on the heating and cooling walls.
一般社団法人日本機械学会の論文
2004-06-25