Investigation on liquid-vapor interface behavior in capillary evaporator for high heat flux loop heat pipe
Investigation on liquid-vapor interface behavior in capillary evaporator for high heat flux loop heat pipe
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DOI：
10.1016/j.ijthermalsci.2019.03.008
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发表时间：
2019-06
影响因子：
4.5
通讯作者：
K. Odagiri;H. Nagano
中科院分区：
文献类型：
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作者：
K. Odagiri;H. Nagano
本文对环路热管蒸发器内的热流体动力学进行了理论和实验研究。建立了一个包含蒸发器内汽液界面行为的稳态模型。该模型考虑了蒸发器传热系数的变化。在LHP模型的基础上设计了一台平板式蒸发器。蒸发器的主要特征如下：在多孔芯中加工的蒸汽槽的数量和宽度分别为85和0.3mm。作为实验的结果，LHP对于550 mm的热传输长度传输高达260 W（18.2 W/cm 2）的热。LHP的最小热阻为0.13 K/W。实验结果与计算结果吻合较好。讨论了LHP运行过程中蒸发器内的液-气界面行为。在此基础上，定量地解释了液-气界面行为与液体热泵传热性能之间的关系。此外，还发现核态沸腾传热的贡献随着加热量的增加而增加。这种现象增强了高热流密度下的传热性能。
This paper reports a theoretical and experimental study on a thermo-fluid dynamics in an evaporator of a loop heat pipe (LHP). A steady-state model that includes liquid–vapor interface behaviors in the evaporator was developed. In this model, the changes in the heat transfer coefficient of the evaporator were considered. A flat-type evaporator was designed on the basis of the LHP model. The main characteristics of the evaporator are as follows: the number and width of the vapor grooves that were processed in a porous wick were 85 and 0.3 mm, respectively. As results of the experiments, the LHP transported heat up to 260 W (18.2 W/cm2) for the heat transport length of 550 mm. The minimum thermal resistance of the LHP was 0.13 K/W. The operating temperature of the experimental result agrees well with the calculation result. The liquid–vapor interface behaviors in the evaporator during the LHP operation were discussed. On the basis of the model, the relation between the liquid–vapor interface behaviors and the heat transfer performance of the LHP was quantitatively explained. In addition, it was found that the contribution of the nucleate boiling heat transfer increased with the applied heat. This phenomenon enhanced the heat transfer performance at high heat flux.