摘要
为了获得开缝布置方式对开缝翅片管换热器传热与阻力特性的影响规律，对5种不同翅片管换热器进行了数值模拟研究，并进行了模化试验验证。结果表明：增加开缝会提高翅片管换热器的传热性能，但阻力也随之增加；与开缝位置相比，开缝歧量对开缝翅片管换热器传热与阻力特性的影响更大；在Re=4800～7500时，开缝翅片管换热器综合流动传热性能Nu／f1/3。随着Re的增大而增大；在5种翅片中，开缝翅片的综合流动传热性能高于普通平直翅片；数值模拟与试验结果偏差较小，采用数值模拟方法能够比较准确地分析开缝翅片管换热器的传热与阻力特性。
In order to obtain the affecting law of slit arrangement on heat transfer and resistance characteristics, numerical simulations and modeling experiments on the fin-and-tube heat exchangers were conducted. The results show that the fin slots can effectively improve heat transfer performance, but also cause additional flow friction. Compared with the slit location, the slit number has a greater impact on the heat transfer and resistance characteristics of slotted fin-and-tube heat exchanger. The comprehensive flow and heat transfer performance index Nu/fl/3 of fin-side increases with an increase in Reynolds number in the range from 4 800 to 7 500. In the five kinds of fin-and-tube heat exchangers, the slotted fin-and-tube heat exchangers have excellent flow and heat transfer performance compared to the plain plate fin heat transfer. There are small deviations between the numerical simulations and experimental test, indicating that the numerical method can be used theoretically to analyze the heat transfer and resistance characteristics of the slotted fin-and-tube heat exchanger.
出处
《热科学与技术》
CAS
CSCD
北大核心
2015年第6期462-469,共8页
Journal of Thermal Science and Technology
关键词
开缝翅片管换热器
综合流动传热性能
数值模拟
模化试验
slotted fin-and-tube heat exchanger
comprehensive flow and heat transfer performance
numerical simulation
modeling experiment
