水平管降膜蒸发器管外液膜的数值模拟  

Numerical Simulation of Film Formation on Horizontal-tube Falling Film Evaporators

作　　者：邱庆刚[1] 陈金波[1] 

机构地区：[1]大连理工大学能源与动力工程学院,大连116024

出　　处：《动力工程学报》2011年第5期357-361,374,共6页Journal of Chinese Society of Power Engineering

基　　金：中央高校基本科研业务费专项资金资助项目(DUT10ZD109);上海市科技攻关资助项目:海水淡化横管降膜蒸发器传热与流动关键技术试验研究

摘　　要：对水平管降膜蒸发器管外液体的成膜情况进行了数值模拟,分析了喷淋密度、管径大小、周向角度等参数对管外液膜厚度及分布的影响,并与相关实验数据进行了比较.结果表明:在喷淋密度一定时,管外液膜厚度在管顶和管底区域较大,在周向120°附近最小;管壁表面的液膜厚度随着喷淋密度的减小而减小,当喷淋密度减小到一定程度时,管壁表面出现了局部"干斑"现象;在喷淋密度一定时,管壁液膜厚度随管径的增大而减小.Numerical simulation of film formation on horizontal-tube falling film evaporators was simulated,during which factors influencing the film thickness and distribution were analyzed,such as the spray density,the tube size and the circular angle of measured point on tube surface etc.The simulated results were subsequently compared with relevant experimental data.Results show that for a fixed spray density,the thickest film forms on both the top and bottom area of tube while the thinnest appear at a circular angle of about 120°;the smaller the spray density is,the thinner the film will be,and when the spray density reduces to a certain value,dry spot will form on local area of tube;for a fixed spray density,the film thickness reduces with rising tube size.

关 键 词：水平管降膜蒸发器 两相流 液膜厚度 喷淋密度 

分 类 号：TK172[动力工程及工程热物理—热能工程]