中文摘要：

目的研究水平管外液膜流动状态的转变规律,模拟分析流量、管径、管间距等对管间流态的影响和液体对管壁的润湿程度.方法建立水平管降膜流态数学模型,通过fluent软件进行模拟计算,分析水平管间溴化锂溶液流态转变过程.结果溴化锂溶液比水具有更好的布膜效果和稳定性.当水平管临界值Re≤34时,管间流态为滴状;

英文摘要：

In this paper,a mathematical and physical model for falling-film-type horizontal-tube was established in the hydro kinetics calculating software called Fluent to simulate the effects of film flow pattern and wetting condition outside horizontal tubes. The solution of lithium bromide and water were selected as spray liquid. With numerical simulation by observing the flow pattern of liquid film,the conversion regularity of flow pattern are studied and the three critical value of flow pattern in the droplet,the columnar and the sheet were obtained,by debugging different flow rate,the minimum flow rate which wet the whole tube wall was obtained,by changing of pipe diametermaterial,tube pitch and solution properties,etc,the change regularity of flow pattern was obtained between tubes. The results show that when Re less than 34,the flow pattern was droplet,when Re between 4 and 122,the flow pattern was columnar,when Re between 122 and 219 the flow pattern was sheet,and the minimum flow rate was 0. 01 L /s. The appears time of the free fall area,the impact area,the development area,the full development area and the wake area were 0. 02 s,0. 04 s,0. 05 s,0. 08 s,0. 1s respectively and the maximum area of velocity and pressure were the impact area and the development area respectively. The flow pattern can be transformed into one or more levels of former with the increase of pipe diameter or tube pitch. The research result has an effect on developing heat and mass transfer model and experimental analysis.