半球内自然対流熱伝達の実験的研究

概要

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An experimental study was performed for natural convection in a hemisphere heated from below. The purpose of the present study was to obtain heat transfer characteristics for a wide range of Rayleigh numbers and to clarify the behavior of thermal plumes in connection with the laminar-turbulent transition of such a flow. Heat-transfer and flow-visualization experiments were carried out using various liquids. The ranges of Rayleigh and Prandtl numbers for the experiments were 1×10^6<Ra<5×10^<10> and 6<Pr<13 000 for the heat-transfer experiment and 5×10^5<Ra<2×10^9 and 6<Pr<13 000 for the flow-visualization experiment. Empirically obtained heat-transfer correlations and the behavior of the thermal plumes generated on the hot surface indicated that the laminar-turbulence transition occurs at Ra 10^9.
一般社団法人日本機械学会の論文
1989-10-25