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Experimental Research on the Thermal Performance and Semi-Visualization of Rectangular Flat Micro-Grooved Gravity Heat Pipes

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  • Xiang Gou

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

  • Qiyan Zhang

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

  • Yamei Li

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

  • Yingfan Liu

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
    Department of Comprehensive Management, CNOOC Energy Conservation & Environmental Protection Service Co., Ltd., Tianjin 300452, China)

  • Shian Liu

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

  • Saima Iram

    (School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China)

Abstract

To strengthen the heat dissipating capacity of a heat pipe used for integrated insulated gate bipolar transistors, as an extension of our earlier work, the effect of micro-groove dimension on the thermal performance of flat micro-grooved gravity heat pipe was studied. Nine pipes with different depths (0.4 mm, 0.8 mm, 1.2 mm) and widths (0.4 mm, 0.8 mm, 1.2 mm) were fabricated and tested under a heating load range from 80 W to 180 W. The start-up time, temperature difference, relative thermal resistance and equivalent thermal conductivity were presented as performance indicators by comparison of flat gravity heat pipes with and without micro-grooves. Results reveal that the highest equivalent thermal conductivity of the flat micro-grooved gravity heat pipes is 2.55 times as that of the flat gravity heat pipe without micro-grooves. The flat gravity heat pipes with deeper and narrower micro-grooves show better thermal performance and the optimal rectangular micro-groove dimension among the selected options is determined to be 1.2 mm (depth) × 0.4 mm (width). Furthermore, the liquid–vapor phase behaviors were observed to verify the heat transfer effects and analyze the heat transfer mechanism of the flat micro-grooved heat pipes.

Suggested Citation

  • Xiang Gou & Qiyan Zhang & Yamei Li & Yingfan Liu & Shian Liu & Saima Iram, 2018. "Experimental Research on the Thermal Performance and Semi-Visualization of Rectangular Flat Micro-Grooved Gravity Heat Pipes," Energies, MDPI, vol. 11(9), pages 1-12, September.
  • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2480-:d:170484
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    References listed on IDEAS

    as
    1. Xin, Fei & Ma, Ting & Wang, Qiuwang, 2018. "Thermal performance analysis of flat heat pipe with graded mini-grooves wick," Applied Energy, Elsevier, vol. 228(C), pages 2129-2139.
    2. Xiang Gou & Yamei Li & Qiyan Zhang & Imran Ali Shah & Dong Zhao & Shian Liu & Yating Wang & Enyu Wang & Jinxiang Wu, 2017. "A Novel Semi-Visualizable Experimental Study of a Plate Gravity Heat Pipe at Unsteady State," Energies, MDPI, vol. 10(12), pages 1-22, December.
    3. Yu, Min & Diallo, Thierno M.O. & Zhao, Xudong & Zhou, Jinzhi & Du, Zhenyu & Ji, Jie & Cheng, Yuanda, 2018. "Analytical study of impact of the wick’s fractal parameters on the heat transfer capacity of a novel micro-channel loop heat pipe," Energy, Elsevier, vol. 158(C), pages 746-759.
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