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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。
Plate micro-heat pipe is a new type of gas-liquid two-phase flow heat-transfer device, which has more advantages in the application of thermal control system with limited space. However, there is still much room for improvement. First of all, the working fluid transport characteristics of a plate micro-heat pipe with a steam chamber were analyzed. A steam chamber with a volume of 45mm × 16mm × 1.75mm was designed and fabricated. The depth of the steam chamber was 200μm. Produced the same size without steam chamber heat pipe heat transfer performance comparison. The experimental results show that the temperature difference between simulation analysis and experiment is about 10%, and the images captured by the high-speed image acquisition system can be well matched with the simulation images. When the input power is 6W, the equilibrium temperature of the steam chamber heat pipe is 70.4 ℃, while the equilibrium temperature of the steam chamber heat pipe without the same power is 118 ℃. Under the input power of 1 ~ 6W, the equilibrium temperature of steam heat pipe is obviously lower than the equilibrium temperature of heat pipe without steam chamber. Therefore, the steam chamber has great influence on reducing circulating resistance of gas working medium and increasing heat transfer capacity of heat pipe. This study can provide reference for the optimal design of plate micro-heat pipe.