低グラスホフ数域における有限長垂直平板の自然対流熱伝達

概要

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Numerical computations and experiments have been carried out to study heat transfer characteristics in natural convection along a vertical finite-length heated plate of uniform temperature. Numerical results were obtained for the Grashof number in a range of 0.1 to 10^5 and for the Prandtl number of 0.71. The average heat transfer coefficients were measured for the Grashof number in a range of 50 to 10^6. The numerical results are in good agreement with the experimental results. The fluid goes up along the plate and it turns near the upper end of the plate because of cooling by the cold surrounding fluid in the upper space. As a consequence, a fluid circulation forms beside the plate. The local heat transfer coefficient is high at both the lower and upper ends of the plate and maitains an almost constant value in the middle portion. The correlations obtained from the numerical and experimental results are as follows : Nu=2.03Gr^<0.0221>(0.1≦Gr≦4), Nu=1.63Gr<0.178>(4≦Gr≦10^6).
一般社団法人日本機械学会の論文
1991-08-25