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CFD Modelling and Visual Analysis of Heat Transfer and Flow Pattern in a Vertical Two-Phase Closed Thermosyphon for Moderate-Temperature Application

Author

Listed:
  • Kaveh Sadeghi

    (Faculty of Mechanical and Mechatronic Engineering, Shahrood University of Technology, Shahrood 36199-95161, Iran)

  • Mostafa Kahani

    (Faculty of Chemical and Materials Engineering, Shahrood University of Technology, Shahrood 36199-95161, Iran)

  • Mohammad Hossein Ahmadi

    (Faculty of Mechanical and Mechatronic Engineering, Shahrood University of Technology, Shahrood 36199-95161, Iran)

  • Mohammad Zamen

    (Faculty of Mechanical and Mechatronic Engineering, Shahrood University of Technology, Shahrood 36199-95161, Iran)

Abstract

A heat pipe is an energy-efficient heat transfer device that relies on evaporation and condensation processes for energy transfer. The main purpose of this study is to simulate a two-phase closed thermosyphon, at moderate temperature, that can be used in industrial applications such as steam power plants. After creating a computational network in the Gambit software, the thermosyphon is simulated in Fluent software using the VOF model. Special oil is employed as the working fluid. Based on the CFD results, the efficiency of the system reaches approximately 96%, and the thermal resistance decreases to 0.54 K/W. The contours of the boiling and evaporation process at differing filling ratios, ranging between 30–90%, is visually investigated and the best performance is obtained for 30% of the filling ratio in thermosyphon. At higher filling ratios, more giant bubbles are generated in thermosyphon, which can attach to the inner wall of the system and reduce the thermal performance. The steady-state condition is obtained 84 s after the start of the process.

Suggested Citation

  • Kaveh Sadeghi & Mostafa Kahani & Mohammad Hossein Ahmadi & Mohammad Zamen, 2022. "CFD Modelling and Visual Analysis of Heat Transfer and Flow Pattern in a Vertical Two-Phase Closed Thermosyphon for Moderate-Temperature Application," Energies, MDPI, vol. 15(23), pages 1-22, November.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:23:p:8955-:d:985406
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    References listed on IDEAS

    as
    1. Zhongchao Zhao & Yong Zhang & Yanrui Zhang & Yimeng Zhou & Hao Hu, 2018. "Numerical Study on the Transient Thermal Performance of a Two-Phase Closed Thermosyphon," Energies, MDPI, vol. 11(6), pages 1-15, June.
    2. Immanuel Voigt & Niklas Lütke & Kai Thüsing & Markus Winkler & Welf-Guntram Drossel, 2022. "Development and Examination of an Internally Switchable Thermosiphon," Energies, MDPI, vol. 15(11), pages 1-11, May.
    3. Xiaohuan Zhao & Yue Zhu & Hailiang Li, 2022. "Micro-Channel Oscillating Heat Pipe Energy Conversion Approach of Battery Heat Dissipation Improvement: A Review," Energies, MDPI, vol. 15(19), pages 1-29, October.
    4. Amr Alhajjaji & Andrew Chiasson & Ahmad Aljabr, 2022. "Simulation-Based Analysis of a Novel CO 2 Ground Source Heat Pipe (GSHP) to Reduce Temperature Fluctuations in Pavements in Different Climatic Conditions," Energies, MDPI, vol. 15(9), pages 1-19, May.
    5. Krzysztof Rajski & Ali Sohani & Sina Jafari & Jan Danielewicz & Marderos Ara Sayegh, 2022. "Energy Performance of a Novel Hybrid Air Conditioning System Built on Gravity-Assisted Heat Pipe-Based Indirect Evaporative Cooler," Energies, MDPI, vol. 15(7), pages 1-18, April.
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