高雷诺数下洗涤冷却管内垂直环状降膜流动传热  

Research on flow characteristics and heat transfer of vertical falling film on sinusoidal corrugated plate under high Reynolds numbers

作　　者：王亮 王亦飞[1] 黄悬悬 李婷婷 曾杰 于广锁[1] WANG Liang;WANG Yifei;HUANG Xuanxuan;LI Tingting;ZENG Jie;YU Guangsuo(East China University of Science and Technology,Clean Coal Technology Research Institute,Shanghai 200237,China)

机构地区：[1]华东理工大学洁净煤技术研究所,上海200237

出　　处：《高校化学工程学报》2024年第3期394-403,共10页Journal of Chemical Engineering of Chinese Universities

基　　金：国家重点研发计划(2017YFB0602601)。

摘　　要：为了研究高雷诺数(R_(e)=1.81×10^(4)~4.23×10^(4))下洗涤冷却管内降液膜的传热特性与机理,对管内液膜厚度分布与传热过程进行模拟计算。研究结果表明,槽缝宽度与液膜Re越大,液膜越厚;液相出口温度随壁面温度而上升,最大传热系数约为3.7×10^(3)W·(m^(2)·K)^(-1);传热系数随进口温度上升而下降,最大传热系数约为8.3×10^(3)·W(m^(2)·K)^(-1);液膜Re的增加使传热系数上升,最大传热系数约为9.4×10^(3)W·(m^(2)·K)^(-1);表征传热系数h+与液膜Re近似于正比例关系;通过研究气液两相传热发现,传热过程在液膜入口段0~0.1 m处最剧烈;传热系数随气相温度上升而先升高后降低,最大传热系数约为899 W×(m^(2)·K)^(-1);计算数据与试验关联式的最小误差约在10%之内。In order to study the effect of heat transfer characteristics and mechanism of falling liquid film in scrubbing cooling pipe under high Reynolds numbers(1.81×10^(4)-4.23×10^(4)),thickness distribution and heat transfer processes of liquid film in the pipe were studied via simulation.The results indicate that larger slot width and liquid film Re can have higher the liquid film thickness.The liquid phase outlet temperature increases with the wall temperature,and the maximum heat transfer coefficient is about 3.7×10^(3)·W(m^(2)·K)^(-1).The heat transfer coefficient decreases as the inlet temperature increases,with the maximum heat transfer coefficient of approximately 8.3×10^(3)·W(m^(2)·K)^(-1).The increase in liquid film Re increases the heat transfer coefficient with the maximum heat transfer coefficient of approximately 9.4×10^(3)·W(m^(2)·K)^(-1).The characteristic heat transfer coefficient h+is proportional to the liquid film Re.By studying gas-liquid two-phase heat transfer,it is found that the most intense heat transfer process happens at a distance of 0-0.1m.The heat transfer coefficient first increases and then decreases with the increase of gas phase temperature,and the maximum heat transfer coefficient is about 899·W(m^(2)·K)^(-1).The minimum error between the calculated data and the experimental correlation is about 10%.

关 键 词：垂直降膜 高雷诺数 液膜分布 对流传热 气液相变 

分 类 号：TQ546[化学工程—煤化学工程]