縦板上凝縮熱伝達の促進 : 第2報,離散ファン付面における熱伝達率の予測(熱工学,内燃機関,動力など)

概要

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In this study, a prediction model for condensation heat transfer on a vertical dispersed finned surface was proposed, utilizing Adamek-Webb model for the condensation heat transfer outside a horizontal finned tube. The prediction model was based on two main experimental observation results. One is the phenomena of the condensate retention at the bottom of each row of the dispersed fin. Another is the offset phenomena of the condensate flow between each row of the dispersed fin. As the results by the present model, it is predicted that the dependence of the condensation heat transfer coefficient for the dispersed fin on the fin pitch is controlled mainly by the dispersed fin length, not the total fin length. On the contrary, for a different fin pitch, the effect to the condensation heat transfer by dispersing is different. From comparison with the experiment results, it is confirmed that the present model was able to predict the condensation with extremely good precision when the fin pitch was larger. Further, when fin pitch was smaller, the predicted value was higher than the experimental value, but the tendency of the condensation heat transfer with dispersing was nearly predicted. In addition, this condensation model can predict experimental value with an error of 25% at the maximum in a range of fin pitch 0.6mm-1mm.
社団法人日本機械学会の論文
2009-09-25