微波浪管传热与阻力特性实验研究

Experiment Study on Heat Transfer and Flow Characteristics in Micro-wavy Tubes

本文以水为工质,对3种不同结构微波浪管内传热与流动特性进行实验研究。在保持热水侧温度和流量不变的情况下,通过改变冷水侧的流量进行不同工况下的实验。结果表明:与直管相比,微波浪管传热性能有大幅提高,在Re<10 000时,3种微波浪管的Nu最大分别增加了111.5%、166.7%和101.4%,摩擦阻力系数f相应增加了95.1%、96.3%和67.5%;在Re>10 000时,3种微波浪管的Nu和f最大分别增加了32.6%、70.6%、61.2%和17.8%、18.1%、12.6%。

The heat transfer and flow characteristics of three micro-wavy tubes with dif- ferent configuration parameters were considered by using single phase water as working medium. The temperature and flow rate of hot water at constant value were kept while changing the temperature and flow rate of cool water during the experiments. The results of experiments show that the heat transfer performance of the micro-wavy tubes is much higher than that of straight tubes. At Re〈10 000 region, the Nu of the three micro-wave tubes increases by 111.5%, 166.7% and 101.4%, compared with that of straight tubes, respectively, while the friction coefficient f increases by 95.1%, 96.3 % and 67.5%. At Re〉10 000 region, the Nu and f of the micro-wavy tubes increase by 32.6%, 70.6%, 61.2% and 17.8%, 18.1%, 12.6%, respectively.