비응축성 기체 존재 시 수직관 외벽에서의 응축 열전달계수 상관식 개발

초록

In this study, condensation heat transfer coefficients are measured in the presence of noncondensable gas (i.e., air) on a vertical tube with a 10-mm outer diameter. Experiments are conducted at pressures ranging from 2 to 5 bar and an air-mass fraction from 10 to 75 %. The experimental results are compared to the heat transfer coefficients obtained on a 40-mm O.D. tube, researched by Lee et al. Using the consolidated data from this study and Lee's and Dehbi's tests, a new empirical correlation for the condensation heat transfer coefficient of an air-steam mixture is developed. The proposed correlation is assessed against Kawakubo's experimental results, and the mean standard deviation is -27 %. © 2018 The Korean Society of Mechanical Engineers.

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