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Experimental Observation of Natural Convection Heat Transfer Performance of a Rectangular Thermosyphon

Author

Listed:
  • C. S. Huang

    (Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan)

  • Chia-Wang Yu

    (Department of Architecture, National Cheng Kung University, Tainan 701, Taiwan)

  • R. H. Chen

    (Department of Mechanical and Energy Engineering, National Chiayi University, Chiayi 600, Taiwan)

  • Chun-Ta Tzeng

    (Department of Architecture, National Cheng Kung University, Tainan 701, Taiwan)

  • Chi-Ming Lai

    (Department of Civil Engineering, National Cheng Kung University, Tainan 701, Taiwan)

Abstract

This study experimentally investigates the natural convection heat transfer performance of a rectangular thermosyphon with an aspect ratio of 3.5. The experimental model is divided into a loop body, a heating section, a cooling section, and two adiabatic sections. The heating section and the cooling section are located in the vertical legs of the rectangular loop. The length of the vertical heating section and the length of the upper and lower horizontal insulation sections are 700 mm and 200 mm, respectively, and the inner diameter of the loop is 11 mm. The relevant parameters and their ranges are as follows: the input thermal power is 30–60 W (with a heat flux in the range of 60–3800 W/m 2 ); the temperature in the cooling section is 30, 40, or 50 °C; and the potential difference between the hot and cold sections is 5, 11, or 18 for the cooling section lengths of 60, 45, and 30 cm, respectively. The results indicate that the value of the dimensionless heat transfer coefficient, the Nusselt number, is generally between 5 and 10. The heating power is the main factor affecting the natural convection intensity of the thermosyphon.

Suggested Citation

  • C. S. Huang & Chia-Wang Yu & R. H. Chen & Chun-Ta Tzeng & Chi-Ming Lai, 2019. "Experimental Observation of Natural Convection Heat Transfer Performance of a Rectangular Thermosyphon," Energies, MDPI, vol. 12(9), pages 1-12, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1702-:d:228483
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    References listed on IDEAS

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    1. Sureshkumar, R. & Mohideen, S. Tharves & Nethaji, N., 2013. "Heat transfer characteristics of nanofluids in heat pipes: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 20(C), pages 397-410.
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    Cited by:

    1. Anna Kraszewska & Janusz Donizak, 2021. "An Analysis of a Laminar-Turbulent Transition and Thermal Plumes Behavior in a Paramagnetic Fluid Subjected to an External Magnetic Field," Energies, MDPI, vol. 14(23), pages 1-23, November.
    2. Jorge de Brito & M. Glória Gomes, 2020. "Special Issue “Building Thermal Envelope”," Energies, MDPI, vol. 13(5), pages 1-5, February.
    3. Chia-Wang Yu & C. S. Huang & C. T. Tzeng & Chi-Ming Lai, 2019. "Effects of the Aspect Ratio of a Rectangular Thermosyphon on Its Thermal Performance," Energies, MDPI, vol. 12(20), pages 1-11, October.
    4. Changhwan Lim & Jonghwi Choi & Hyungdae Kim, 2021. "Experimental Investigation of the Heat Transfer Characteristics and Operation Limits of a Fork-Type Heat Pipe for Passive Cooling of a Spent Fuel Pool," Energies, MDPI, vol. 14(23), pages 1-24, November.

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