蒸汽腔平板微热管仿真及传热性能测试

平板微热管是一种新型的气液两相流传热器件,在空间有限的紧凑器件热控系统中应用更有优势,但是目前性能仍有很大提升空间。首先分析了具有蒸汽腔的平板微热管的工质输运特性,设计并制作了体积为45mm×16mm×1.75mm的蒸汽腔微热管,其中蒸汽腔的深度为200μm。制作了同样尺寸的无蒸汽腔微热管进行传热性能对比。试验结果表明,仿真分析与试验的温度差异在10%左右,高速图像采集系统采集图像与仿真图像可以较好地吻合。当输入功率为6W时,蒸汽腔热管的平衡温度为70.4℃,而相同功率下没有蒸汽腔热管的平衡温度为118℃。在1~6W输入功率下,蒸汽腔热管的平衡温度要明显低于没有蒸汽腔热管的平衡温度,因此蒸汽腔对于减小气态工质循环阻力,提高微热管传热能力有较大影响。本研究可为平板微热管的优化设计提供借鉴。

Simulating and Thermal Performance Test of Micro Heat Pipe With Steam Chamber

The fiat micro heat pipe,a new type of heat transfer devices of gas-liquid two-phase flow,has more advantages in the application of thermal control system with compact devices in the limited space,but its performance still has great room to improve.On the basis of analyzing the working medium transport characteristics of flat micro heat pipe with steam chamber,the micro heat pipe with a dimension of 45mm× 16mm× 1.75mm is designed and fabricated.The depth of the steam chamber is 200μtm.A micro heat pip in the same size without steam chamber is fabricated to compare the heat transfer performance.Experimental results show that when the temperature difference between simulation and experiment is around 10％,the images collected by high speed image acquisition system can be well in accordance with the simulation results.When the input power is 6W,the balance temperature of heat pipe with steam chamber is 70.4℃ while the heat pipe without steam chamber is 118 ℃.Meanwhile,the equivalent temperature with steam chamber under the input power from 1W to 6W is lower than without steam chamber.Hence,the stream chamber has a great influence on reducing the gaseous medium circulation resistance and improving the ability of heat production.The research work of this paper can provide reference for optimization design of flat micro heat pipe.