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1報,上壁よどみ点における伝熱特性(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 carrried 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 and 300 mm and heat flux of heated surface is changed as q_b=140〜320 W/m^2. The distance between the two surfaces was changed as H=100〜500 mm and Rayleigh number based on this distance is changed as Ra_H=1.45×10^6〜4.06×10^8. The temperature at the stagnation point of the plume colliding on the top surface which is kept at the adiabatic condition is measured and defined as the adiabatic wall temperature. Then the top surace is heated and the surface temperature at the stagnation point is measured again under the same plume impinging condition. The heat transfer coefficient is defined as the difference of these two surface temperatures. The obtained heat transfer coefficients are well correlated by Nu_t0∝Ra^1/3_H.
社団法人日本機械学会の論文
2002-03-25