摘要
提出了三种矩形平翅片的几何变形片, 以矩形平翅片管作为比较对象, 在吸风式直流风洞中进行了开口( 孔) 侧背风等六种方案的空气外掠单排翅片管的对比性实验研究,得到了具有实用价值的结论。实验证实:在最窄截面风速 Umax = 3 ~9 m/s 的范围内,b型翅片管在孔侧迎风时, 平均当量换热系数比平翅片管提高了13 .4 % ; 孔侧背风时, 提高了11 % ,是三种片型中的最优形状。该片型是一种换热性能优异,具有深入研究价值的片型。
Three rectangular fins with changed geometry are proposed in this paper.A comparative experiment was carried out in which the air flows through the out_surface of a single row of finned tubes in a drawing wind tunnel and six versions were performed with cut side facing the wind or opposite to the wind and the results are compared with a plain finned tube.Some useful results are obtained.The experiment results show that in the range of wind velocity flowing the narrowest area,3 m/s≤Umax≤9 m/s,when the cut side of type b finned tube facing the wind,the average heat transfer coefficient is by 13.4% higher than the plain finned tube and when opposite to the wind it is by 11% higher.Type b fin has optimal geometry shape among the three fin types.This fin type has advantage of high heat transfer performance and is worth further researching.
出处
《重庆建筑大学学报》
CSCD
1999年第4期35-39,共5页
Journal of Chongqing Jianzhu University
关键词
翅片
换热器
强化传热
fin
heat exchanger
enhancement of heat transfer