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Heat and Flow Characteristics of Aerofoil-Shaped Fins on a Curved Target Surface in a Confined Channel for an Impinging Jet Array

Author

Listed:
  • Orhan Yalçınkaya

    (Mechanical Engineering Department, Faculty of Engineering, Sakarya University, 54050 Sakarya, Türkiye)

  • Ufuk Durmaz

    (Mechanical Engineering Department, Faculty of Engineering, Sakarya University, 54050 Sakarya, Türkiye)

  • Ahmet Ümit Tepe

    (Department of Electricity and Energy, Vocational School of Technical Sciences at Mersin Tarsus Organized Industrial Zone, Tarsus University, 33100 Mersin, Türkiye)

  • Ali Cemal Benim

    (Center of Flow Simulation (CFS), Faculty of Mechanical and Process Engineering, Düsseldorf University of Applied Sciences, Münsterstr. 156, 40476 Düsseldorf, Germany)

  • Ünal Uysal

    (Mechanical Engineering Department, Faculty of Engineering, Sakarya University, 54050 Sakarya, Türkiye)

Abstract

The main purpose of this investigation was to explore the heat transfer and flow characteristics of aero-foil-shaped fins combined with extended jet holes, specifically focusing on their feasibility in cooling turbine blades. In this study, a comprehensive investigation was carried out by applying impinging jet array cooling ( IJAC ) on a semi-circular curved surface, which was roughened using aerofoil-shaped fins. Numerical computations were conducted under three different Reynolds numbers ( Re ) ranging from 5000 to 25,000, while nozzle-to-target surface spacings ( S / d ) ranged from 0.5 to 8.0. Furthermore, an assessment was made of the impact of different fin arrangements, single-row ( L 1 ), double-row ( L 2 ), and triple-row ( L 3 ), on convective heat transfer. Detailed examinations were performed on area-averaged and local Nusselt ( Nu ) numbers, flow properties, and the thermal performance criterion ( TPC ) on finned and smooth target surfaces. The study’s results revealed that the use of aerofoil-shaped fins and the reduction in S / d , along with surface roughening, led to significant increases in the local and area-averaged Nu numbers compared to the conventional IJAC scheme. The most notable heat transfer enhancement was observed at S / d = 0.5 utilizing extended jets and the surface design incorporating aerofoil-shaped fins. Under these specific conditions, the maximum heat transfer enhancement reached 52.81%. Moreover, the investigation also demonstrated that the highest TPC on the finned surface was achieved when S / d = 2.0 for L 2 at Re = 25,000, resulting in a TPC value of 1.12. Furthermore, reducing S / d and mounting aerofoil-shaped fins on the surface yielded a more uniform heat transfer distribution on the relevant surface than IJAC with a smooth surface, ensuring a relatively more uniform heat transfer distribution to minimize the risk of localized overheating.

Suggested Citation

  • Orhan Yalçınkaya & Ufuk Durmaz & Ahmet Ümit Tepe & Ali Cemal Benim & Ünal Uysal, 2024. "Heat and Flow Characteristics of Aerofoil-Shaped Fins on a Curved Target Surface in a Confined Channel for an Impinging Jet Array," Energies, MDPI, vol. 17(5), pages 1-21, March.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:5:p:1238-:d:1351560
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    References listed on IDEAS

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    1. Zhang, Yuntian & Zuo, Wei & E, Jiaqiang & Li, Jing & Li, Qingqing & Sun, Ke & Zhou, Kun & Zhang, Guangde, 2022. "Performance comparison between straight channel cold plate and inclined channel cold plate for thermal management of a prismatic LiFePO4 battery," Energy, Elsevier, vol. 248(C).
    2. Li, Dexin & Zuo, Wei & Li, Qingqing & Zhang, Guangde & Zhou, Kun & E, Jiaqiang, 2023. "Effects of pulsating flow on the performance of multi-channel cold plate for thermal management of lithium-ion battery pack," Energy, Elsevier, vol. 273(C).
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