常温与低温下波纹翅片流动传热性能模拟研究  

Simulation study of flow and heat transfer performance between normal temperature and low temperature in wavy fins channel

作　　者：汪涵 张启勇[1] 朱志刚[1] Wang Han;Zhang Qiyong;Zhu Zhigang(Hefei Institutes of Physical Science,Chinese Academy of Science,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学院合肥物质科学研究院,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《低温与超导》2021年第7期74-78,83,共6页Cryogenics and Superconductivity

基　　金：国家重大科技基础设施建设项目(2018-000052-73-01-001228);安徽省自然科学基金(1908085QE233);中国科学院等离子体物理研究所科学基金项目(DSJJ-18-04)资助。

摘　　要：低温换热器是低温系统中的关键设备,对系统性能有着直接影响。翅片作为换热器的核心部件,其结构很大程度上决定了换热性能。采用数值模拟方法,对低温氦气在波纹翅片通道内的流动换热特性进行研究,模拟了不同工况对翅片性能的影响,并且分析了低温与常温下波纹振幅以及波长对翅片性能的影响程度。结果表明:低温工况下,氦气在波纹翅片通道内的传热性能优于常温工况,且随着雷诺数的增大,这种差异更明显,而阻力特性在这两种工况下无明显变化;随着波长的减小和振幅的增大,j、f因子均增大;低温下,随着振幅及波长的增大,其换热阻力特性的变化幅度与常温下相比逐渐降低。The low-temperature heat exchanger is the key equipment in the cryogenic system, which has a direct impact on the cryogenic system performance. As the core parts of heat exchanger, fins structure determines the heat transfer performance to a large extent.This article adopted the numerical simulation method to investigate the flow and heat transfer characteristics of low-temperature helium in wavy fins channel.The influence of different working conditions on the fin performance was simulated, and the influence degree of ripple amplitude and wavelength on the fin performance was analyzed.The results show that the heat transfer performance of helium in the wavy fins channel at low temperature is better than that at normal temperature, and the difference is more obvious with the increase of Reynolds number, while the flow resistance characteristics have changed little at these two conditions. With the decrease of wavelength and amplitude, both j and f factors increase.At low temperature, with the increase of amplitude and wavelength, the variation range of heat transfer and flow resistance characteristics decreases gradually compared with that at normal temperature.

关 键 词：低温板翅式换热器 波纹翅片 流动换热性能 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]