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Visualization Study on Thermo-Hydrodynamic Behaviors of a Flat Two-Phase Thermosyphon

Author

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  • Chao Wang

    (School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China)

  • Feng Yao

    (School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China
    Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China)

  • Juan Shi

    (Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China)

  • Liangyu Wu

    (School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China)

  • Mengchen Zhang

    (Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China)

Abstract

The coupled effect of boiling and condensation inside a flat two-phase thermosyphon has a non-negligible influence on the two-phase fluid flow behavior and heat transfer process. Therefore, a flat two-phase thermosyphon with transparent wall was manufactured. Based on this device, a visualization experiment system was developed to study the vapor–liquid two-phase behaviors and thermal performance of the flat two-phase thermosyphon. A cross-shaped wick using copper mesh was embedded into the cavity of two-phase thermosyphon to improve the heat transfer performance. The effects of heat flux density, working medium, and wick structure on the thermal performance are examined and analyzed. The results indicated that a strong liquid disturbance is caused by the bubble motions, leading to the enhancement of both convective boiling and condensation heat transfer. More bubbles are generated as the heat flux increases; therefore, the disturbance of bubble motion on liquid pool and condensation film becomes stronger, resulting in better thermal performance of the flat two-phase thermosyphon. The addition of the wick inside the cavity effectively reduces the temperature oscillation of the evaporator wall. In addition, the wick structure provides backflow paths for the condensate owing to the effect of capillary force and enhances the vapor–liquid phase change heat transfer, resulting in the improvement of thermal performance for the flat two-phase thermosyphon.

Suggested Citation

  • Chao Wang & Feng Yao & Juan Shi & Liangyu Wu & Mengchen Zhang, 2018. "Visualization Study on Thermo-Hydrodynamic Behaviors of a Flat Two-Phase Thermosyphon," Energies, MDPI, vol. 11(9), pages 1-13, August.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2295-:d:166832
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    References listed on IDEAS

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    1. Ling, Ziye & Cao, Jiahao & Zhang, Wenbo & Zhang, Zhengguo & Fang, Xiaoming & Gao, Xuenong, 2018. "Compact liquid cooling strategy with phase change materials for Li-ion batteries optimized using response surface methodology," Applied Energy, Elsevier, vol. 228(C), pages 777-788.
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    Cited by:

    1. Qin, Siyu & Liu, Yijia & Yang, Changming & Jin, Liwen & Yang, Chun & Meng, Xiangzhao, 2023. "Visualization study of co-existing boiling and condensation heat transfer in a confined flat thermosyphon," Energy, Elsevier, vol. 285(C).
    2. Artur J. Jaworski, 2019. "Special Issue “Fluid Flow and Heat Transfer”," Energies, MDPI, vol. 12(16), pages 1-4, August.

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