Experimental analysis of pump-assisted and capillary-driven dual-evaporators two-phase cooling loop
Experimental analysis of pump-assisted and capillary-driven dual-evaporators two-phase cooling loop
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DOI：
10.1016/j.applthermaleng.2012.01.022
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发表时间：
2012-05
影响因子：
6.4
通讯作者：
Michael Crepinsek;Chanwoo Park
中科院分区：
文献类型：
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作者：
Michael Crepinsek;Chanwoo Park
为了研究多蒸发器冷却回路的性能，构建了一种机械泵辅助毛细管驱动两相冷却回路，该回路采用双蒸发器供液管路并联和串联的方式。在蒸发器中，通过毛细作用将液体和蒸汽空间分开的多孔膜用于促进低热阻的薄膜沸腾。首先使用机械泵将储液器中的液体供应到蒸发器中的液体空间并返回到储液器。然后，蒸发器中的一部分液体通过毛细作用被拉动通过多孔膜，到达多孔针翅，并在施加热量的蒸发器加热器块上蒸发。在使用双蒸发器回路的这项研究中，使用高达1200瓦（102 W/cm 2）或每个蒸发器600瓦的步进式热输入来测试各种热负荷条件。并行和串行测试所经历的困难和局限性进行了讨论。试验结果表明，两相系统的总输入热量决定系统的温度和压力，而各蒸发器的输入热量决定蒸发器的温度。并联设置蒸发器比串联设置蒸发器允许更多的热负荷。此外，由于蒸发器通过蒸汽和液体管线连接，即使其热输入没有改变，一个蒸发器也可以改变另一个蒸发器的沸腾条件（热阻）。
A mechanical pump-assisted and capillary-driven two-phase cooling loop, with dual-evaporators whose liquid supply lines connected in parallel and series in one loop, was constructed to experimentally investigate the performance of the multi-evaporators cooling loop. In the evaporator, a porous membrane separating liquid and vapor spaces by capillary action is used to promote a thin-film boiling of low thermal resistance. The liquid in a reservoir is first supplied using a mechanical pump to the liquid space in the evaporator and back to the liquid reservoir. Then, a fraction of the liquid in the evaporator is pulled by capillary action through the porous membrane, to porous pin fins and is vaporized on the evaporator heater block where the heat is applied. In this study using the dual-evaporators loop, various heat load conditions were tested using the stepwise heat inputs up to 1200 Watts (102 W/cm2), or 600 Watts for each evaporator. Difficulties and limitations experienced with both parallel and series tests are discussed. It is found from the tests that the total heat inputs in the two-phase system govern the system temperatures and pressures, while the individual heat input to each evaporator determines the evaporator temperatures. Setting up the evaporators in parallel allows for more heat load than series. Also, since the evaporators are connected through the vapor and liquid lines, one evaporator can change another evaporator’s boiling condition (thermal resistance) even though its heat input is not changed.