滴状翅片管传热及阻力特性的试验研究

Experimental Study of the Heat Transfer and Resistance Characteristics of Drop-shaped Finned Tubes

对滴状翅片管的传热及阻力性能进行了试验,给出了不同风速、温度下的试验结果。探讨了对流换热系数的分离方法。依据实测的数据,将管外空气横掠管簇的对流换热系数从传热系数中分离了出来。对管外的对流换热特性、阻力特性进行了分析研究,并整理成了无量纲准则式。试验表明滴状翅片管的阻力较小,试件性能达到国际先进水平。

Tests were conducted of the heat transfer and resistance performance of drop-shaped finned tubes and test results obtained under different air velocities and temperatures are presented.A method for the separation of convection heat exchange factors is explored.On the basis of the actually measured data the convection heat exchange factor for the tube group swept by the tube-outside air was separated from the heat transfer factor.The tube-outside convection heat exchange characteristics and resistance characteristics are analyzed and studied.Moreover, they have been processed into a dimensionless criterion.The results of the test indicate that the drop-shaped finned tubes feature a relatively low resistance and the test sample performance has attained an international advanced level.