Investigating the effect of double-layer wick thickness ratio on heat transfer performance of loop heat pipe
Investigating the effect of double-layer wick thickness ratio on heat transfer performance of loop heat pipe
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DOI：
10.1016/j.ijthermalsci.2014.07.014
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发表时间：
2014-12
影响因子：
4.5
通讯作者：
Shen-Chun Wu;Dawn Wang;Yau‐Ming Chen
中科院分区：
文献类型：
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作者：
Shen-Chun Wu;Dawn Wang;Yau‐Ming Chen
研究了双层吸液芯厚度比对环路热管传热性能的影响。由于芯的外层是双孔的以允许蒸汽行进，并且内层是单孔的以提供毛细力，因此在本研究中使用的芯消除了当使用单孔芯时遇到的芯的结构强度和蒸汽释放困难的问题。通过改变双层毛细芯的厚度比，可以提高LHP的传热性能;在总毛细芯厚度一定的情况下，通过调节双孔层和单孔层的厚度来改变双层毛细芯的厚度比，厚度比越大，毛细芯越具有双孔毛细芯的特性，厚度比越小，毛细芯越具有单孔毛细芯的特性。在本研究中，研究的比值为0.28、0.42、0.57、0.71、0.86和1。结果表明，在0.57时，85 °C下的最大热负荷为1060 W，总热阻为0.065 °C/W，热流密度为50 W/cm 2，传热系数为188 kW/m2°C，孔隙率为82%。与迄今为止报道的双层吸液芯性能相比，性能提高了约50%，与单孔吸液芯相比，性能提高了约200%。成功地确定了最佳壁厚比，临界热负荷首次达到kW量级。拟合并建立了单孔（厚度比0）[1]、双层（厚度比0.28 ∶ 0.86）和双孔（厚度比1）吸液芯的LHP性能结果的趋势线和经验方程，为今后的设计提供参考。
This study investigated the effect of double-layer wick thickness ratio on the heat transfer performance of loop heat pipe (LHP). With the outer layer of the wick being biporous to allow vapor to travel and the inner layer being monoporous to provide capillary force, the wick used in this study eliminated the problems with wick's structural strength and difficulty in vapor release encountered when using a monoporous wick. By changing the double-layer wick thickness ratio, the LHP heat transfer performance was enhanced.Under a fixed total wick thickness, the double-layer wick thickness ratio was varied by adjusting the biporous and monoporous layers' thicknesses; higher thickness ratio corresponds to the wick having more biporous wick characteristics, and lower thickness ratio corresponds to the wick being more like a monoporous wick. In this study, the ratios investigated were 0.28, 0.42, 0.57, 0.71, 0.86, and 1. Results showed that at 0.57, the highest heat load under 85 °C was 1060 W, the total thermal resistance was 0.065 °C/W, the heat flux was 50 W/cm2, the heat transfer coefficient was 188 kW/m2°C, and the porosity was 82%. Compared with the double-layer wick performance reported thus far, performance was increased by about 50%, and compared with that of the monoporous wick, the performance increase was about 200%. The best thickness ratio was successfully determined, and the critical heat load reached, for the first time, the order of kW. A trend line and empirical equation for LHP performance results for monoporous (thickness ratio 0) [1], double-layer (thickness ratio 0.28 ∼ 0.86), and biporous (thickness ratio 1) wicks were fitted and established, providing a reference for future designs.