温度差大なる場合の乱流強制対流熱伝達

概要

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The convective heat-transfer coefficient under large temperature difference is affected by the variation of fluid properties due to temperature. In this paper the heat transfer coefficient for circular cylinder in a longitudinal flow of air measured by cooling method is shown and compared with analytical results which was so1ved by a senior author previously. The effect of the temperature difference on the correlation between Nusselt number and Reynold rumber is eliminated, when the physical properties in these non-dimensional modulus are evaluated at θ_*=0.5θ_0+0.5θ_1 or θ_<**>=0.3θ_0+0.7θ_1,where θ_0 and θ_1 are the temperatures of the surface and the atmosphere. No remarkable difference between these two methods for the evaluation of the physical properties can be recognized, but the latter (θ_<**>) seems to be better. The analysis shows also that the temperature θ_<**> must be prefered.
社団法人日本機械学会の論文
1958-04-25