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首页> 外文期刊>International Journal of Heat and Mass Transfer >Operational characteristics of a loop heat pipe with a flat evaporator and two primary biporous wicks
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Operational characteristics of a loop heat pipe with a flat evaporator and two primary biporous wicks

机译：具有平面蒸发器和两个主要双孔芯的环形热管的运行特性

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摘要

Loop heat pipe (LHP) is an efficient heat transfer device with excellent performance. Its operation is based on the evaporation and condensation of the internal working fluid, and the compensation chamber temperature controls the loop operating temperature. Compared with cylindrical evaporator LHP, the flat evaporator LHP benefits from the flat thermo-contact surface, but suffers from more heat leak. In this paper, an LHP with a flat evaporator and two primary biporous wicks is studied for reducing the impact of heat leak on the compensation chamber. Liquid supply for the wick in the evaporator back is guaranteed by ensuring that the system is at a favorable elevation with slopes of 10° and 90° in the experiment. When the evaporator wall temperature is lower than 90 ℃, the maximum operational heat load can reach 270 W with a slope of 90°, which corresponds to a heat flux of 26.5 W/cm~2. The maximum heat load is 210 W with the 10° slope. The system can start up steadily with a low heat load of 10 W, while a similar structure with single wick fails at this heat load. When heat loads are applied to both the evaporator wall and back simultaneously, the system has better operating performance for lower temperatures and thermal resistance. The wick in the evaporator back improves the performance at low heat load for the operation with only one side heat load, and plays a role in all operations with bifacial heat loads. As the heat load increases, the evaporating heat transfer coefficient increases to a maximum, and then settles maintaining a high value. The thermal resistance of the LHP with two primary wicks is lower for a larger slope. The minimum thermal resistance of the LHP is 0.218 ℃/W at 270 W with a slope of 90°.
机译：回路热管（LHP）是一种高效的传热设备，具有出色的性能。其操作基于内部工作流体的蒸发和冷凝，补偿室温度控制回路的工作温度。与圆柱形蒸发器LHP相比，平面蒸发器LHP受益于平坦的热接触表面，但存在更多的热泄漏。在本文中，研究了带有平面蒸发器和两个主双孔芯的LHP，以减少热泄漏对补偿室的影响。通过确保系统在实验中以10°和90°的斜率处于有利的高度，可以确保为蒸发器后部的油芯提供液体。当蒸发器壁温低于90℃时，最大工作热负荷可以达到270 W，倾斜度为90°，相当于26.5 W / cm〜2的热通量。斜率为10°时，最大热负荷为210W。该系统可以在10 W的低热负荷下稳定启动，而在这种热负荷下具有单芯的类似结构会失效​​。当同时对蒸发器壁和后壁施加热负荷时，该系统具有更好的运行性能，可降低温度和降低热阻。蒸发器背部的棉芯可提高低热负荷下仅一侧热负荷运行的性能，并在所有带有双面热负荷的运行中发挥作用。随着热负荷的增加，蒸发的传热系数增加到最大值，然后稳定保持较高的值。对于较大的斜率，带有两个主油芯的LHP的热阻较低。 LHP的最小热阻在270 W，90°倾斜时为0.218℃/ W。

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  • 作者

    Dongdong Wang; Zhichun Liu; Song He; Jinguo Yang; Wei Liu;

  • 作者单位

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China, 318 Power Building, 1037 Luoyu Road, Hongshan District, Wuhan 430074, China;

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

    School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biporous wick; Loop heat pipe; Flat evaporator; Heat flux; Bifacial heat load;

    机译：双孔灯芯;回路热管;平面蒸发器;热通量;双面热负荷;

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