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Dependence of Conjugate Heat Transfer in Ribbed Channel on Thermal Conductivity of Channel Wall: An LES Study

Author

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  • Joon Ahn

    (School of Mechanical Engineering, Kookmin University, Seoul 02707, Korea)

  • Jeong Chul Song

    (School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, Korea)

  • Joon Sik Lee

    (School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, Korea)

Abstract

A series of large eddy simulations was conducted to analyze conjugate heat transfer characteristics in a ribbed channel. The cross section of the rib is square and the blockage ratio is 0.1. The pitch between the ribs is 10 times the rib height. The Reynolds number of the channel is 30,000. In the simulations, the effect of the thermal resistance of the solid wall of the channel on convective heat transfer was observed in the turbulent flow regime. The numerical method used was based on the immersed boundary method and the concept of effective conductivity is introduced. When the conductivity ratio between the solid wall and the fluid ( K *) exceeded 100, the heat transfer characteristics resembled those for an isothermal wall, and the cold core fluid impinging and flow recirculation mainly influenced the convective heat transfer. For K * ≤ 10, the effect of the cold core fluid impinging became weak and the vortices at the rib corners strongly influenced the convective heat transfer; the heat transfer characteristics were therefore considerably different from those for an isothermal wall. At K * = 100, temperature fluctuations at the upstream edge of the rib reached 2%, and at K * = 1, temperature fluctuations in the solid region were similar to those in the fluid region. The rib promoted heat transfer up to K * = 100, but not for K * ≤ 10. The Biot number based on the channel wall thickness appears to adequately explain the variation of the heat transfer characteristics with K *.

Suggested Citation

  • Joon Ahn & Jeong Chul Song & Joon Sik Lee, 2021. "Dependence of Conjugate Heat Transfer in Ribbed Channel on Thermal Conductivity of Channel Wall: An LES Study," Energies, MDPI, vol. 14(18), pages 1-18, September.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5698-:d:632843
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    References listed on IDEAS

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    1. Joon Ahn & Jeong Chul Song & Joon Sik Lee, 2021. "Fully Coupled Large Eddy Simulation of Conjugate Heat Transfer in a Ribbed Channel with a 0.1 Blockage Ratio," Energies, MDPI, vol. 14(8), pages 1-17, April.
    2. Ditaranto, Mario & Heggset, Tarjei & Berstad, David, 2020. "Concept of hydrogen fired gas turbine cycle with exhaust gas recirculation: Assessment of process performance," Energy, Elsevier, vol. 192(C).
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    Cited by:

    1. Artur S. Bartosik, 2022. "Numerical Heat Transfer and Fluid Flow: A Review of Contributions to the Special Issue," Energies, MDPI, vol. 15(8), pages 1-8, April.
    2. Artur S. Bartosik, 2023. "Numerical Heat Transfer and Fluid Flow: New Advances," Energies, MDPI, vol. 16(14), pages 1-7, July.
    3. Joon Ahn, 2023. "Large Eddy Simulation of Flow and Heat Transfer in a Ribbed Channel for the Internal Cooling Passage of a Gas Turbine Blade: A Review," Energies, MDPI, vol. 16(9), pages 1-20, April.

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