分离式热管换热器传热特性的实验研究

Experimental Studies to Heat Transfer Characteristics of Separated Heat Pipes

本文在自行设计分离式热管实验装置的基础上,对其传热特性进行了实验研究。其工作温度为170～250℃,热流密度为25～50 kW/m^2。蒸发段和冷凝段构成相同,均是由7根直径30 mm的无缝钢管短管束组成,管长为160 mm,带有紧套的钢帛环形肋片结构尺寸为:外径45 mm、厚1 mm、片间距4 mm。实验结果表明,在本实验条件下,分离式热管的最佳充液率按管束总容量计为18%～38%。根据实验结果拟合了最佳充液率(24%)下蒸发段内部平均沸腾换热系数和冷凝段内部凝结换热努塞尔数综合关系式。

Some experimental studies were carried out to heat transfer characteristics of separated heat pipes,which based on the experiment device of separated heat pipes designed by ourselves.The studies were taken under the following conditions：the temperature was between 170℃and 250℃and the heat current was between 25 kW/m^2 and 50 kW/m^2.The evaporation and condensation were composed of seven 30 mm seamless steel pipe with a steel silk annular fins,the length of the pipes were 160 mm.The dimensions of silk annular fins were outside diameter 45 mm,thick film 1 mm,4 mm pitch.The experimental results showed that the most optimum filling liquid ratio of separated heat pipes was between 18%and 38%by all capacity of pipes.According to the results of the experiments,the synthetical equation of the average coefficient of boiling heat exchanging in evaporator and of coefficient of heat exchanging Nusselt in condenser was fitted under the most optimum filling liquid ratio（24%）.