摘要
本文求得了计算椭圆管外局部凝结换热系数、总平均凝结换热系数及局部凝结液膜厚度的解析式,并给出了计算实例.同时,得到了平均凝结换热系数相对于等周长圆管而言增加的百分数随b/a的变化规律,导出了对工程实际有意义的凝结换热准则关系式.
An elliptical arc is found to have been formed by several circular arcs. The analytic expressions for local and total average coefficient of condensation heat transfer and for condensate film thickness outside an elliptical tube are derived by solving the comlete problem in sections. A computational example is given. The variation of percentage increase in the average coefficient of condensation heat transfer with the ratio b/a on the elliptical pipe is calculated, which is treated as a round pipe having the same perimeter. The dimensionless number relationship for calculating average condensation Nu is given
出处
《华中理工大学学报》
CSCD
北大核心
1989年第6期1-6,共6页
Journal of Huazhong University of Science and Technology
关键词
椭圆管
凝结换热
冷凝传热
Condensation heat transfer
Elliptical pipe
Thermo-convection coeffi- cient
