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Experimental Study and Visual Observation of a Loop Heat Pipe with a Flat Disk-Shaped Evaporator under Various Orientations

Author

Listed:
  • Huanfa Wang

    (Laboratory of Fundamental Science on Ergonomics and Environmental Control, School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China)

  • Guiping Lin

    (Laboratory of Fundamental Science on Ergonomics and Environmental Control, School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
    Aircraft and Propulsion Laboratory, Ningbo Institute of Technology, Beihang University, Ningbo 315100, China)

  • Xiaobin Shen

    (Laboratory of Fundamental Science on Ergonomics and Environmental Control, School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
    Aircraft and Propulsion Laboratory, Ningbo Institute of Technology, Beihang University, Ningbo 315100, China)

  • Yong Liu

    (Shenyang Aircraft Design & Research Institute, Shenyang 110035, China)

  • Yuandong Guo

    (Laboratory of Fundamental Science on Ergonomics and Environmental Control, School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
    Aircraft and Propulsion Laboratory, Ningbo Institute of Technology, Beihang University, Ningbo 315100, China)

Abstract

In this study, visualization treatment was applied to the flat disk-shaped evaporator of a loop heat pipe. By observing the liquid/vapor behavior inside the evaporator and compensation chamber, the effects of orientation on the performances during startup and during a step-increase in heat load were investigated. With water as the working fluid, the loop heat pipe was tested under three typical orientations of φ = −90°, φ = 0°, and φ = +90°. The startup time was the shortest for the φ = −90° orientation but there could be a slight temperature overshoot, resulting in an unsmoothed startup process. The startup speeds under the φ = 0° and φ = +90° orientations were similar, both without any significant temperature overshoot. The orientation could significantly change the heat leak and, therefore, the operating temperature and the heat-transfer limit. For the φ = +90° and φ = −90° orientations, the heat-transfer limits were about 71% and 157% of the value at the φ = 0° orientation, respectively. Based on visual observations, for the loop heat pipe operating in gravity-driven mode, there could be two different paths for the working fluid to return to the evaporator, namely, along the vapor line for low heat loads and along the condenser and liquid lines for relatively large heat loads, respectively.

Suggested Citation

  • Huanfa Wang & Guiping Lin & Xiaobin Shen & Yong Liu & Yuandong Guo, 2023. "Experimental Study and Visual Observation of a Loop Heat Pipe with a Flat Disk-Shaped Evaporator under Various Orientations," Energies, MDPI, vol. 16(13), pages 1-17, June.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:13:p:5068-:d:1183811
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    References listed on IDEAS

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    1. Du, Kun & Calautit, John & Wang, Zhonghua & Wu, Yupeng & Liu, Hao, 2018. "A review of the applications of phase change materials in cooling, heating and power generation in different temperature ranges," Applied Energy, Elsevier, vol. 220(C), pages 242-273.
    2. Wang, Xianling & Yang, Jingxuan & Wen, Qiaowei & Shittu, Samson & Liu, Guangming & Qiu, Zining & Zhao, Xudong & Wang, Zhangyuan, 2022. "Visualization study of a flat confined loop heat pipe for electronic devices cooling," Applied Energy, Elsevier, vol. 322(C).
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