水平三维肋管外含不凝性气体的水蒸汽凝结换热的实验研究  

Experimental Investigation of Condensation Heat Transfer of Non-condensable Gas Containing Steam on 3-Dimensionally Finned Tubes,Horizontally Positioned

作　　者：朱恂[1] 李刚[1] 廖强[1] 冯云鹏[1] 

机构地区：[1]重庆大学工程热物理研究所,重庆400044

出　　处：《动力工程》2006年第5期694-698,共5页Power Engineering

基　　金：国家科技攻关计划资助项目(2003BA808A19-5)

摘　　要：对水平光管和三维肋管管外具有不同空气含量的水蒸汽凝结换热性能进行了实验研究。获得了不凝性气体含量和壁面过冷度对光管和三维肋管凝结换热性能的影响规律。实验结果表明：在相同的工况条件下，水平三维肋管的凝结换热系数是光管的1．7～2．9倍；不凝性气体含量越高，凝结换热系数越低；壁面过冷度越大，凝结换热系数越大。最后，获得了水平三维肋管管外凝结换热实验关系式。Experimental studies have been conducted concerning heat transfer characteristics of condensation heat transfer of steam, containing air in different proportions, on the external surface of horizontally positioned smooth as well as of 3- dimensionally finned tubes. Herewith, the influence of the non-conden：~able gas content and the tube surface＇s degree of supercooling on condensation heat transfer were found for the two kinds of tubes. Results show that, under same test conditions, the condensation heat transfer coefficient of horizontally positioned 3-dimentionally finned tubes is 1.7- 2.9 times that of smooth tubes; the higher the non-condensable gas content, the smaller the coefficient, while the larger the surface＇s degree of undercooling, the larger the coefficient will be. Finally an experimental condensation heat transfer correlation formula for the external surface of horizontally positioned 3 - dimensionally finned tubes was found. Figs 8, table 1 and refs 9.

关 键 词：工程热物理 水平三维肋管 凝结换热 不凝性气体 

分 类 号：TK121[动力工程及工程热物理—工程热物理]