摘要
利用竖直有机玻璃管建立立式蒸发式冷凝器性能测试实验平台,测试了进口风速、管高度、传热温差及插入螺旋线对冷凝器传热性能的影响.结果表明：在一定传热温差下,舍伍德数与液膜雷诺数近似呈线性关系,当插入螺旋线后近似呈二次曲线关系;进口风速控制在3.3m/s以下可防止液泛现象的发生;存在着一个最佳换热管的高度范围（0.8～0.9m）,在该范围内出口空气的相对湿度最大;螺旋线线径与换热管内径之比在0.06～0.29之间时,可以起到明显的强化传热作用,使舍伍德数提高15%以上.
In this paper, a device for testing the performance of evaporative condenser with a vertical plexiglas tube was built up, and the influences of the inlet velocity, the tube height, the heat-transfer temperature difference and the spiral insert on the heat transfer performance of the proposed evaporative condenser were investigated. It is found that, at a certain temperature difference, the relationship between the Sherwood number and the Reynolds number of the falling liquid film is approximately linear, and takes on the form of a quadratic curve in the condition of spiral inserts, that an inlet velocity under 3.3 m/s may prevent the liquid from flooding, that there is an optimal tube height range of 0. 8 to 0. 9 m where the outlet air possesses the largest relative humidity, and that the heat transfer is greatly enhanced and the Sherwood number increases by more than 15% when the ratio of spiral insert diameter to tube diameter ranges from 0. 06 to 0. 29.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第2期112-116,共5页
Journal of South China University of Technology(Natural Science Edition)
基金
教育部新世纪优秀人才支持计划项目(NCET040826)
关键词
竖管
蒸发式冷凝器
传热性能
强化
下降液膜
vertical tube
evaporativecondenser
heat transfer performance
enhancement
falling liquid film
