摘要
在恒热流边界条件下,对以空气为工质的分别带有3种不同纵向内翅片换热管的流动与换热特性进行了实验研究,实验管带有堵塞芯管.3种不同的纵向内翅片为:平直翅片、带有突起的翅片以及波纹形翅片.得出了所测参数范围内的换热与阻力的实验关系式.采用两种不同的标准对所测3根换热管的综合换热性能进行了评价,结果表明,带有波纹形内翅片的换热管在两种评价标准下均表现出了优异的综合换热性能.
Pressure drop and heat transfer characteristics of air in three annular tubes with different internal longitudinal fins were investigated experimentally at uniform wall heat flux. The tested tubes had a double-pipe structure with the inner blocked tube as an insertion. Three different kinds of fins, plain rectangle fin, plain rectangle fin with periodical ridges and wave-like fin, were located peripherally in the annulus. The friction factor and Nusselt number could be well corrected by a power law correction in the Reynolds number range tested. It was found that the tube with periodical ridges on the plain fin or with waveqike fin could enhance heat transfer; however, pressure drop was increased simultaneously. In order to evaluate the comprehensive heat transfer characteristics of the tested tubes, two criteria for evaluating the comprehensive thermal performance of tested tubes were adopted. They are： （1） evaluating the comprehensive heat transfer performance under three conditions--identical mass flow, identical pumping power and identical pressure drop;（2） the second law of thermodynamics, i.e. , the entropy generation. According to the two different evaluating methods, it was found that tube with wave like fins provided the most excellent comprehensive heat transfer performance among the three tubes, especially when it was used under higher Reynolds number conditions.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第11期2543-2548,共6页
CIESC Journal
基金
教育部霍英东教育基金会高等院校青年教师基金项目(91056).~~
关键词
内翅片管
凸起
波纹形翅片
性能评价
internal finned tube
ridge
wave-like longitudinal fin
performance evaluation
