水平平行二平板間自然対流における対向壁面への熱伝達 : 第2報,サーマルプルームの流速特性(熱工学,内燃機関,動力など)

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This paper describes impinging heat transfer from buoyant plume to horizontal downward surface. Experiments are carried out for a plume produced by heating up the center of the bottom surface settled in parallel to the upper downward surface. The size of heated surface diameter on the bottom wall is D=100 mm and terperaure of heated surface is changed as ΔT_bc=16.0〜40.1 K. The distance between the two surfaces was canged as H=100〜280 mm and Rayleigh number based on this distance is changed as Ra_H=1.68×10^6〜7.93×10^7. After acceleration is finished, velocity of thermal plume formed from the bottom heated surface approaches to a constant value. It is concluded that the heat transfer coefficient of the top wall at stagnation point becomes a constant as the result.
社団法人日本機械学会の論文
2002-03-25