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Heat transfer of film condensation is of interest in many industrial application, and many paper, concerned with laminar film condensation on a isothermal surface, have been reported. However, in the majority of cases when film condensation occurs, the surface temperature decreases along the surface in the direction of condensate flowing down. This paper describes an analytical and experimental study of laminar film condensation on nonisothermal vertical plate, of which one side condensation occurs, and the other cooling water passes with constant heat transfer coefficient. The results of analysis based on Nusselt theory indicate that distribution of surface temperature, heat flux and heat transfer coefficient can be approximated to the power law variation, xn, wherexis a distance along with the surface in the direction of condensate flowing down andnis the value varies with the ratio of steam side thermal resistance to all except steam side. Experimental results are good agreement with those distributions, while average heat transfer coefficient defined on the basis of the integrated mean temperature is about 13% above the theoretical value and the same results are obtained in the experiment of isothermal case.
公益社団法人日本マリンエンジニアリング学会の論文