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Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink

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  • Eui-Hyeok Song

    (School of Mechanical Engineering, Chungbuk National University, 1 ChungDae-ro, SeoWon-gu, Cheongju, Chungbuk 28644, Korea)

  • Kye-Bock Lee

    (School of Mechanical Engineering, Chungbuk National University, 1 ChungDae-ro, SeoWon-gu, Cheongju, Chungbuk 28644, Korea
    Kye-Bock Lee equally contributed to this work as a co-corresponding author.)

  • Seok-Ho Rhi

    (School of Mechanical Engineering, Chungbuk National University, 1 ChungDae-ro, SeoWon-gu, Cheongju, Chungbuk 28644, Korea)

  • Kibum Kim

    (School of Mechanical Engineering, Chungbuk National University, 1 ChungDae-ro, SeoWon-gu, Cheongju, Chungbuk 28644, Korea)

Abstract

A concentric annular heat pipe heat sink (AHPHS) was proposed and fabricated to investigate its thermal behavior. The present AHPHS consists of two concentric pipes of different diameters, which create vacuumed annular vapor space. The main advantage of the AHPHS as a heat sink is that it can largely increase the heat transfer area for cooling compared to conventional heat pipes. In the current AHPHS, condensation takes place along the whole annular space from the certain heating area as the evaporator section. Therefore, the whole inner space of the AHPHS except the heating area can be considered the condenser. In the present study, AHPHSs of different diameters were fabricated and studied experimentally. Basic studies were carried out with a 50 mm-long stainless steel AHPHS with diameter ratios of 1.1 and 1.3 and the same inner tube diameter of 76 mm. Several experimental parameters such as volume fractions of 10–70%, different air flow velocity, flow configurations, and 10–50 W heat inputs were investigated to find their effects on the thermal performance of an AHPHS. Experimental results show that a 10% filling ratio was found to be the optimum charged amount in terms of temperature profile with a low heater surface temperature and water as the working fluid. For the methanol, a 40% filling ratio shows better temperature behavior. Internal working behavior shows not only circular motion but also 3-D flow characteristics moving in axial and circular directions simultaneously.

Suggested Citation

  • Eui-Hyeok Song & Kye-Bock Lee & Seok-Ho Rhi & Kibum Kim, 2020. "Thermal and Flow Characteristics in a Concentric Annular Heat Pipe Heat Sink," Energies, MDPI, vol. 13(20), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5282-:d:426436
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    References listed on IDEAS

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    1. Jouhara, H. & Chauhan, A. & Nannou, T. & Almahmoud, S. & Delpech, B. & Wrobel, L.C., 2017. "Heat pipe based systems - Advances and applications," Energy, Elsevier, vol. 128(C), pages 729-754.
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    Cited by:

    1. Eui-Hyeok Song & Kye-Bock Lee & Seok-Ho Rhi, 2021. "Thermal and Flow Simulation of Concentric Annular Heat Pipe with Symmetric or Asymmetric Condenser," Energies, MDPI, vol. 14(11), pages 1-23, June.
    2. Birol Kılkış & Malik Çağlar & Mert Şengül, 2021. "Energy Benefits of Heat Pipe Technology for Achieving 100% Renewable Heating and Cooling for Fifth-Generation, Low-Temperature District Heating Systems," Energies, MDPI, vol. 14(17), pages 1-54, August.
    3. Łukasz Adrian & Szymon Szufa & Piotr Piersa & Piotr Kuryło & Filip Mikołajczyk & Krystian Kurowski & Sławomir Pochwała & Andrzej Obraniak & Jacek Stelmach & Grzegorz Wielgosiński & Justyna Czerwińska , 2021. "Analysis and Evaluation of Heat Pipe Efficiency to Reduce Low Emission with the Use of Working Agents R134A, R404A and R407C, R410A," Energies, MDPI, vol. 14(7), pages 1-29, March.
    4. Pawel Znaczko & Emilian Szczepanski & Kazimierz Kaminski & Norbert Chamier-Gliszczynski & Jacek Kukulski, 2021. "Experimental Diagnosis of the Heat Pipe Solar Collector Malfunction. A Case Study," Energies, MDPI, vol. 14(11), pages 1-19, May.

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