波浪形扰流元件对管翅式换热器传热及压降的影响

Effect of wavy vortex generators on heat transfer and pressure drop of fin-and-tube heat exchanger

为了进一步提高管翅式换热器在气体侧的传热性能,在矩形扰流元件对管翅式换热器强化传热以及压降影响的基础上,对特殊的波浪形扰流元件案例进行了数值分析。对比分析了1000~1400雷诺数范围内,矩形、上波浪形和下波浪形扰流元件以及无扰流元件案例对气体侧的传热特性以及压降的影响。结果表明:管翅式换热器的传热性能受扰流元件形状的影响较大,且在相同雷诺数下,采用下波浪形扰流元件可以显著增强气体侧的传热性能,同时又使得气体在流动过程中具有相对适中的压降。

In order to improve the heat transfer performance of the fin-and-tube heat exchanger on the gas side,a numerical study on the cases of wavy up and wavy down was carried out on the basis of the influence of rectangular vortex generator on the heat transfer enhancement and pressure drop of the fin-and-tube heat exchanger.The influence of rectangular,wavy up and wavy down vortex generators and the ones without vortex generators on the heat transfer characteristics and flow structure of the gas side is studied and analyzed in the range of 1000 to 1400 Reynolds number.The results showed that the heat transfer performance of the fin-and-tube heat exchanger was greatly affected by the shape of the vortex generator.The use of the wavy down vortex generator can significantly enhance the heat transfer performance at the same Reynolds number,and at the same time,the pressure drop of flow was relatively moderate on the gas side.