| 摘要: |
| 为满足电子设备高效冷却的需要，本文从提高毛细压力、降低流动阻力、强化蒸发器壁面传热能力以及降低热泄漏方面入手，设计了一种具有新型蒸发器结构的平板环路热管。利用集成蒸汽通道的一体式双孔毛细芯替代传统的机械加工微槽道，并在反重力条件下对其传热性能进行实验研究。结果表明：该环路热管具有良好的反重力运行性能，能够在20 W热负荷下实现快速、低温启动，且无温度波动现象；在200 W热负荷下，能够维持蒸发器最高温度在80 ℃以下，环路热管的热阻仅为0.15 K/W。由于新型蒸发器结构缩短了热传递路径，降低了蒸发/沸腾的强化以及热泄漏，与传统结构的环路热管对比，能够有效提升环路热管的反重力运行能力。 |
| 关键词: 环路热管 反重力实验 蒸发器 双孔毛细芯 |
| DOI： |
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| 基金项目:国家自然科学基金项目(51436004, 51276061)和中央高校基本科研业务费专项资金(JB2015202)资助项目。 |
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| Anti-gravity Operating Performance of a Miniature Loop Heat Pipe with Flat Evaporator |
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Yang Wolong, Ji Xianbing, Xu Jinliang
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| (North China Electric Power University, State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Multiphase Flow and Heat Transfer) |
| Abstract: |
| To meet the needs of efficient electronics cooling, a flat loop heat pipe (LHP) with novel evaporator structure was designed based on improving capillary pressure, decreasing flow resistance, enhancing heat transfer and reducing heat leakage. Compared with evaporator of conventional flat loop heat pipe, the novel evaporator replaced mechanical microchannels with biporous microchannels. Heat transfer performance of the LHP was investigated at the anti-gravity orientation. The experimental result showed that, the LHP can start-up quickly without any temperature overshoot and oscillation at the heat load of 20 W. Besides, the novel LHP was able to keep the highest temperature of the evaporator below 80℃, and the thermal resistance of LHP was only 0.15 K/W at the heat load of 200 W. The comparative experiments indicated that the novel design of evaporator can shorten the heat transfer route in the height direction, enhance evaporation/boiling heat transfer and further reduce heat leakage, thus improved the anti-gravity operating ability of LHP. |
| Key words: loop heat pipe anti-gravity experiment evaporator biporous |
