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Experimental Study of Heat Transfer on the Internal Surfaces of a Double-Wall Structure with Pin Fin Array

Author

Listed:
  • Wei Zhang

    (School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
    School of Aero-Engine, Shenyang Aerospace University, Shenyang 110136, China)

  • Huiren Zhu

    (School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China)

  • Guangchao Li

    (School of Aero-Engine, Shenyang Aerospace University, Shenyang 110136, China)

Abstract

The double-wall structure is one of the most effective cooling techniques used in many engineering applications, such as turbine vane/blade, heat exchangers, etc. Heat transfer on the internal surfaces of a double-wall structure was studied at impinging Reynolds numbers ranging from 1 × 10 4 to 6 × 10 4 using the transient thermochromic liquid crystal (TLC) technique. The two-dimensional distributions of Nusselt numbers and their averaged values were obtained on the impingement surface, target surface and the pin fin surface. The Nusselt number correlations on the surfaces mentioned above were determined as a function of Reynolds number. The results show that the second peak values of the Nusselt number distribution appear on the target surface at all Reynolds numbers studied in this paper for a short distance of the target surface to impingement surface. This phenomenon becomes significant with the further increase of the Reynolds number. The difference between the Nusselt number at the second peak and the stagnation point decreases with the increasing Reynolds number. The maximal Nusselt number regions on the impingement surface appear at the left and right sides of the pin fins between the two impingement holes. The Nusselt numbers of the pin fin surfaces are highly dependent on their various locations in the double-wall structures. The contributions of the impingement surface, pin fin surface and target surface to the overall heat transfer rate are analyzed. The target surface contributed the largest amount of heat transfer rate with a value of about 62%. The heat transfer contribution is from 18% to 21% for the impingement surface and 16% to 18% for the pin fin surfaces within the studied Reynolds numbers.

Suggested Citation

  • Wei Zhang & Huiren Zhu & Guangchao Li, 2020. "Experimental Study of Heat Transfer on the Internal Surfaces of a Double-Wall Structure with Pin Fin Array," Energies, MDPI, vol. 13(24), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:24:p:6573-:d:461482
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    References listed on IDEAS

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    1. Abdulrahman H. Alenezi & Abdulrahman Almutairi & Hamad M. Alhajeri & Abdulmajid Addali & Abdelaziz A. A. Gamil, 2018. "Flow Structure and Heat Transfer of Jet Impingement on a Rib-Roughened Flat Plate," Energies, MDPI, vol. 11(6), pages 1-16, June.
    2. Florian Ries & Yongxiang Li & Dario Klingenberg & Kaushal Nishad & Johannes Janicka & Amsini Sadiki, 2018. "Near-Wall Thermal Processes in an Inclined Impinging Jet: Analysis of Heat Transport and Entropy Generation Mechanisms," Energies, MDPI, vol. 11(6), pages 1-23, May.
    3. Mahir Faris Abdullah & Rozli Zulkifli & Zambri Harun & Shahrir Abdullah & Wan Aizon Wan Ghopa, 2018. "Experimental and Numerical Simulation of the Heat Transfer Enhancement on the Twin Impingement Jet Mechanism," Energies, MDPI, vol. 11(4), pages 1-21, April.
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    Cited by:

    1. Liang Xu & Zineng Sun & Qicheng Ruan & Lei Xi & Jianmin Gao & Yunlong Li, 2023. "Development Trend of Cooling Technology for Turbine Blades at Super-High Temperature of above 2000 K," Energies, MDPI, vol. 16(2), pages 1-19, January.

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