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Single-Loop Triple-Diameter Pulsating Heat Pipes at Reduced Heat Input: A CFD Study on Inner Diameter Optimization

Author

Listed:
  • Rasoul Fallahzadeh

    (Department of Engineering for Industrial Systems and Technologies, University of Parma, 43124 Parma, Italy)

  • Masoud Hatami Garousi

    (Department of Engineering for Industrial Systems and Technologies, University of Parma, 43124 Parma, Italy)

  • Luca Pagliarini

    (Department of Engineering for Industrial Systems and Technologies, University of Parma, 43124 Parma, Italy)

  • Fabio Bozzoli

    (Department of Engineering for Industrial Systems and Technologies, University of Parma, 43124 Parma, Italy)

  • Luca Cattani

    (Department of Engineering for Industrial Systems and Technologies, University of Parma, 43124 Parma, Italy)

Abstract

The geometric configuration, particularly the inner tube diameter, plays a significant role in the thermal performance of pulsating heat pipes (PHPs). Previous experimental research has demonstrated that single-loop triple-diameter PHPs (TD-PHPs) outperform single-loop single-diameter PHPs (SD-PHPs) and dual-diameter PHPs (DD-PHPs) in terms of thermal performance under moderate heating input powers ranging from 25 W to 75 W. However, a reduction in heat input from 75 W to 25 W leads to a diminished impact of TD-PHPs on the thermal performance. Therefore, to improve the overall performance of TD-PHPs, this study used two-dimensional transient computational fluid dynamics simulations to identify the optimal inner tube diameters for TD-PHPs at a low heat input by evaluating the thermal resistance of five TD-PHPs with various inner diameters. The findings reveal that the TD-PHP configuration exhibits minimum thermal resistance, with inner diameters of 4.5 mm for the upper arch (the condenser section), 4.0 mm for the wide branch, and 2.5 mm for the narrow branch, primarily due to its full circulation flow pattern. Furthermore, the overall heat transfer performance of the optimal TD-PHP was compared with that of an SD-PHP at low heat inputs (10 and 18 W), indicating that although the optimal TD-PHP shows lower thermal resistance, it does not significantly affect the start-up time.

Suggested Citation

  • Rasoul Fallahzadeh & Masoud Hatami Garousi & Luca Pagliarini & Fabio Bozzoli & Luca Cattani, 2024. "Single-Loop Triple-Diameter Pulsating Heat Pipes at Reduced Heat Input: A CFD Study on Inner Diameter Optimization," Energies, MDPI, vol. 17(22), pages 1-19, November.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:22:p:5568-:d:1515984
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    References listed on IDEAS

    as
    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.
    2. Jiangchuan Yu & Sihui Hong & Sasaki Koudai & Chaobin Dang & Shuangfeng Wang, 2023. "An Experimental Investigation on the Heat Transfer Characteristics of Pulsating Heat Pipe with Adaptive Structured Channels," Energies, MDPI, vol. 16(19), pages 1-18, October.
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