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Numerical Investigation of Flow and Heat Transfer in Rectangular Microchannels with and without Semi-Elliptical Protrusions

Author

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  • Haiou Sun

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Hao Fu

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Lanyi Yan

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Hongfei Ma

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Yigang Luan

    (College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)

  • Franco Magagnato

    (Institute of Fluid Mechanics, Karlsruhe Institute of Technology, Kaiserstra ße 10, Bldg. 10.23., 76131 Karlsruhe, Germany)

Abstract

Micro-cooling is a growing trend in the field of turbine blade cooling. Technical difficulties in the experiments of large-aspect-ratio rectangular microchannels that are commonly used in the turbine blades cause the rareness of related literature. In this study, the flow characteristics and heat transfer performance of the microchannels with and without semi-ellipsoidal protrusions, whose height is 0.6 mm and width is 9 mm, are numerically investigated. In the microchannel without protrusions, when 2214 < Re < 3589, the velocity has a Λ-shaped distribution, resulting in a Λ-shaped Nu distribution on the wall. When Re > 3760, it is worth noting that from the sidewall to the middle of the channel, Nu first decreases and then increases. In the microchannel with protrusions, when Re < 1214, the turbulence formed by the protrusion is almost all behind it and does not spread to both sides. When 1214 < Re < 2374, the turbulence caused by the protrusions gradually spreads to the middle and both sides of the channel with the increase in Re . When 2374 < Re < 3815, the turbulence caused by two columns of protrusions meet in the middle of the channel and forms stronger turbulence downstream. When Re > 3815, the flow is all turbulent. The protrusions enhance the irreversibility of heat transfer and friction. The performance evaluation criteria (PEC) increases first and then decreases with Re and the maximum value is 1.80 at Re = 2004. In this work, the details that are difficult to obtain in experiments are fully analyzed to provide suggestions for the design of micro-cooling structures in gas turbine blades.

Suggested Citation

  • Haiou Sun & Hao Fu & Lanyi Yan & Hongfei Ma & Yigang Luan & Franco Magagnato, 2022. "Numerical Investigation of Flow and Heat Transfer in Rectangular Microchannels with and without Semi-Elliptical Protrusions," Energies, MDPI, vol. 15(13), pages 1-30, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:13:p:4927-:d:856314
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    References listed on IDEAS

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    1. Dimitris Drikakis & Michael Frank & Gavin Tabor, 2019. "Multiscale Computational Fluid Dynamics," Energies, MDPI, vol. 12(17), pages 1-17, August.
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    Cited by:

    1. Oleg A. Kolenchukov & Kirill A. Bashmur & Sergei O. Kurashkin & Elena V. Tsygankova & Natalia A. Shepeta & Roman B. Sergienko & Praskovya L. Pavlova & Roman A. Vaganov, 2023. "Numerical and Experimental Study of Heat Transfer in Pyrolysis Reactor Heat Exchange Channels with Different Hemispherical Protrusion Geometries," Energies, MDPI, vol. 16(16), pages 1-27, August.

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