傾斜円柱の自然対流による表面伝熱率

概要

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Although many researches have been made on the heat loss from the horizontal cylinder or vertical wall, very few on the heat loss from the inclined cylinder due to free convection and apparently the definite relations between the heat transfer coefficient, dimensions and inclinations of the cylinder in this case, have not been obtained as yet. From this point of view, measurements were carried out on the heat losses from the inclined circular cylinders in the still air the different cylinder temperatures, in which measurements diameter (d), length (l) and inclination (θ) of the cylinders were chosen as follows : d=3〜30mm, l/d=1〜200,θ=0〜90℃. From the results of experiments, the heat transfer coefficients by free convection (α_c) were evaluated and shown by diagrams and then expressed by the following formulae ; [numerical formula] where λ_m, γ_m, μ_m and T_m are mean thermal conductivity, mean specific weight, mean viscosity and mean absolute temperature of surrounding gas, respectively, and ΔT is temperature difference between the cylinder surface and the gas and m, n, and K are constants depending on the inclination. The authors wish to thank Miss Y. Akashi, for her help in conducting the experiment. The authors are also glad to acknowledge that the research was carried out partly with the Grants-in-Aid for Scientific Research of the Ministry of Education.
一般社団法人日本機械学会の論文
1954-04-25