非均匀截面自激振荡流热管内热传输特性实验研究

Experimental Study of Heat Transmission Characteristics inside Self-excitation Oscillation Flow Heat-pipes of Non-uniform Section

针对两种不同截面结构的回路型自激振荡流热管,其中,一种内径为3 mm的均匀截面;另一种是在此均匀截面的基础上,将其加热段和绝热段断面加工成垂直交错布置的椭圆形非均匀截面。运用实验研究的方法,在热管壁面不同部位分别布置了温度测点,在不同功率的激光加热条件下,通过对热管壁温监测数据的采集和分析,研究了这种非均匀截面回路型自激振荡流热管内部的热传输性能,并与均匀截面自激振荡流热管进行了对比分析。结果表明:非均匀截面自激振荡流热管内的脉动机制以及热传输特性与均匀截面有很大不同,在中、高负荷条件下,非均匀截面结构热管可以明显起到强化传热效果,与均匀截面结构热管相比,热传输功率提高了13.6%。

For two kinds of loop type self-excitation oscillation flow heat-pipes with different sectional structures,i.e.one of a uniform section with an inner diameter of 3 mm and another,on the basis of the above-mentioned uniform section,having an elliptical non-uniform section obtained by machining its heating and adiabatic segments into a vertically staggered arrangement,studied was the internal heat transmission performance of the above loop type heat-pipes of non-uniform section under the condition of being heated by laser with various power ratings.The study has been conducted by adopting and experimental study method and through an acquisition and analysis of temperature data monitored from the heat-pipe wall.To perform the above study,various temperature measurement points were arranged at different locations on the heat pipe wall.Furthermore,a contrast analysis has been conducted with respect to the performance of the uniform section self-excitation flow heat pipes.The results of the analysis show that the pulsation mechanism and heat transmission characteristics of the self-excitation oscillation-flow heat-pipes of non-uniform section are quite different from those of uniform section heat pipes.At medium and high loads,non-uniform section structured heat pipes can obviously strengthen heat transfer effect.Compared with heat pipes of uniform section,they can increase the heat transmission power by 13.6%.