Heat and mass transfer of heated falling film under gas liquid cross flow condition
Jiang Bin1, Wang Ziyun2, Fu Xiangzhao3, Wang Yong3
(1.School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010,China; 2.College of Architecture and Environment, Sichuan University, Chengdu, Sichuan 610065, China; 3.MOE Key Laboratory of Three Gorges Reservoir Region′s Eco-Environment, Chongqing University, Chongqing 400045, China)
Abstract：Based on volume of fluid(VOF) method, heat and mass transfer of heated falling film under gas liquid cross flow condition was investigated. Surface tension and species transport were taken into account. In order to verify reliability of the model, the experiment was performed by non contact infrared thermal imaging technology under gas liquid cross flow condition. Heat and mass transfer of heated falling film under gas liquid cross flow condition was investigated experimentally and theoretically The results show that the simulated dimensionless wall temperature is in good agreement with the experimental data. Based on the model, the influence of surface tension coefficient, solid liquid contact angle and liquid film flow rate on heat transfer of liquid film was simulated. It is found that, remaining constant of other parameters, liquid film interfacial area decreases from 82.7％ to 73.2％ in corresponding with surface tension coefficient increases from 0.014 N／m to 0.072 N／m, and the liquid film interfacial area decreases from 80.6％ to 69.4％ in corresponding with solidliquid contact angle increases from 30°to 60°. Low liquid film flow rat e makes thin liquid film and is beneficial to evaporation of liquid film. On the contrary, large liquid film flow rate makes thick liquidfilm and lower humidity ratio per unit volume and is harmful to the evaporation of liquid film.
蒋 斌, 王子云, 付祥钊, 王 勇. 气液叉流下受热液膜的热质传递特性[J]. 排灌机械工程学报, 2011, 29(5): 432-436.
Jiang Bin, Wang Ziyun, Fu Xiangzhao, Wang Yong. Heat and mass transfer of heated falling film under gas liquid cross flow condition. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(5): 432-436.
