文献类型：期刊文献

英文题名：Study on falling film in large-diameter tube and co-current gas-liquid heat transfer under high temperature and velocity of gas flow

作者：Wang, Liang[1];Huang, Xuan-xuan[1];Wang, Yi-fei[1];Yu, Guang-suo[1]

机构：[1]East China Univ Sci & Technol, Clean Coal Technol Res Inst, Shanghai 200237, Peoples R China

年份：2026

卷号：225

起止页码：230

外文期刊名：CHEMICAL ENGINEERING RESEARCH & DESIGN

收录：;EI(收录号：20255019701345);WOS:【SCI-EXPANDED(收录号:WOS:001640927800001)】；

基金：This work was supported by the National Key R & D Program of China (2017YFB0602601) .

语种：英文

外文关键词：Vertical falling film; High Reynolds number; High temperature gas; Phase change heat transfer; Liquid film temperature; Heat transfer coefficient

摘要：The phase change heat and mass transfer of gas-liquid two-phase evaporation in cube has always been the research focus of falling film cooling. Especially the gas-liquid heat transfer process under high temperature and high airflow velocity conditions. In order to study the heat and mass transfer process of falling film evaporation in tube under high liquid film Reynolds number conditions, cooling falling film model in the tube was established using fluent software. Study the influence of internal platform height and liquid film Reynolds number of cooling ring on the vertical annular cooling falling film distribution, and through user define function(UDF) to study the gas-liquid two-phase evaporation phase change heat transfer process. The results indicate the higher platform height leads to larger liquid film thickness, the average liquid film velocity is decrease, and turbulence intensity is increase. As the width of the crevice increases, the thickness of the liquid film also increases, but when the width of the gap exceeds 3.5 mm, the thickness of the liquid film decreases. The flow velocity and turbulence intensity of the liquid film decrease with the increase of crevice width. The thickness and flow velocity of the liquid film increase with Reynolds number, but the amplitude of the increase gradually decreases, and the turbulence intensity of liquid film decreases. The higher gas temperature increases the cross-sectional temperature and axis temperature of the gas-liquid two-phase flow, and vapor content increases. The lower inlet water temperature, the lower cross-sectional temperature and axis temperature, and the greater heat transfer coefficient(HTC)between gas-liquid phase. The maximum HTC is about 724 W/(m2 & sdot;K). The maximum deviation of HTC is about 17.83 %, and the minimum deviation is 12.08 %.The vapor content increases with the decrease of inlet water temperature. The HTC and vapor content between gas and liquid increase with the increase of liquid film Reynolds number. The maximum deviation between the calculated HTC and the reference experimental value is 15.14 %, and the minimum deviation is 12.62 %. The dimensionless HTC is directly proportional to the Reynolds number of the liquid film and the dimensionless temperature, and the fitting curve deviation R2= 0.984.