POST-DRYOUT HEAT TRANSFER CHARATERISTICS AND PREDITION METHOD FOR CO2 IN HORIZONTAL MINITUBES
Because of the steep decrease of the flow boiling heat transfer coefficient of CO2 at moderate vapor quality, the post-dryout heat transfer characteristic of CO2 is an important parameter in designing heat exchangers. In this study, the post-dryout heat transfer coefficients were analyzed by dividing two regions based on the observation of the trends of the heat transfer coefficients. One is a transition region, and the other is a fully dryout region. When the Shah model was applied to the heat transfer coefficients of the transition region, the mean deviation between the experimental results and the estimated data was 25.3％. The Groeneveld model was applied to the fully dryout region, yielding the mean deviation of 36.4％. The Groeneveld model is suggested for the post-dryout heat transfer coefficient, and the Yun et al. model is recommeded for the pre-dryout heat transfer coefficient. The critical liquid film model was applied to predict the dryout vapor quality in the present model.
R.Yun Y.Lee Y.Kim
Department of Mechanical Engineering, Hanbat National University,San 16-1, Duckmyung-dong, Yuseong-g Department of Mechanical Engineering, Korea University,Anam-dong, Sungbuk-ku, Seoul, 136-701, Korea
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）