Effect of inventory on the heat performance of copper–water loop heat pipe
Effect of inventory on the heat performance of copper–water loop heat pipe
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DOI：
10.1016/j.expthermflusci.2012.09.030
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发表时间：
2013
影响因子：
3.2
通讯作者：
Li Zhang;Jiayin Xu;Hong Xu
中科院分区：
文献类型：
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作者：
Li Zhang;Jiayin Xu;Hong Xu
对铜水环路热管（LHP）在四种不同充注比（52.2-78.3%）下的运行特性进行了实验研究，包括启动性能、传热能力和热阻。 LHP 有一个带有烧结铜芯的圆柱形蒸发器（直径 22 毫米，长 80 毫米），蒸发器外壳和芯表面之间的间隙被消除，以获得较低的接触热阻。吸芯孔隙率为44.54%，有效孔径半径为19.11μm。实验表明，较高的库存量是在低热负荷范围内保持吸液芯饱和以及在中热负荷范围内从冷凝器提供足够流量的过冷液体以冷却补偿室中的水的有效方法。因此，通过最佳体积比69.6%的LHP充注，实现了260s的快速启动（热负荷：30W；热通量：8.5×103W/m2）、最大传热能力500W（允许蒸发器壁温85℃下）和最小LHP热阻0.075℃/W（500W热负荷下）。
The operating characteristics of a copper–water loop heat pipe (LHP), including start-up property, heat-transfer capacity, and heat resistance, under four different charge ratios (52.2–78.3%) were experimentally investigated. The LHP had a cylindrical evaporator (22mm diameter and 80mm long) with a sintered copper wick, and the clearance between the evaporator envelope and the wick surface was eliminated to attain a low heat contact resistance. The porosity of the wick was 44.54%, and the effective pore radius was 19.11μm. The experiment showed that higher inventory is an effective method in keeping the wick saturated within the low heat-load range and in supplying adequate flow of the subcooled liquid from the condenser to cool the water in the compensation chamber within the medium heat-load range. Thus, fast start-up of 260s (heat load: 30W; heat flux: 8.5×103W/m2), maximum heat-transfer capacity of 500W (under allowable evaporator wall temperature of 85°C), and minimum LHP thermal resistance of 0.075°C/W (under 500W heat load) were realized by the LHP charged with an optimal 69.6% volume ratio.