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Numerical Study of Heat Transfer Enhancement of Internal Flow Using Double-Sided Delta-Winglet Tape Insert

Author

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  • Agung Tri Wijayanta

    (Department of Mechanical Engineering, Universitas Sebelas Maret, Kampus UNS Kentingan, Jl. Ir. Sutami 36A Kentingan, Surakarta 57126, Indonesia)

  • Muhammad Aziz

    (Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan)

  • Keishi Kariya

    (Department of Mechanical Engineering, Graduate School of Science and Engineering, Saga University, 1 Honjomachi, Saga-shi 840-8502, Japan)

  • Akio Miyara

    (Department of Mechanical Engineering, Graduate School of Science and Engineering, Saga University, 1 Honjomachi, Saga-shi 840-8502, Japan)

Abstract

A numerical study was performed to investigate the thermal performance characteristics of an enhanced tube heat exchanger fitted with punched delta-winglet vortex generators. Computational fluid dynamics modeling was applied using the k–ε renormalized group turbulence model. Benchmarking was performed using the results of the experimental study for a similar geometry. Attack angles of 30°, 50°, and 70° were used to investigate the heat transfer and pressure drop characteristics of the enhanced tube. Flow conditions were considered in the turbulent region in the Reynolds number range of 9100 to 17,400. A smooth tube was employed for evaluating the increment in the Nusselt number and the friction factor characteristics of the enhanced tube. The results show that the Nusselt number, friction factor, and thermal performance factor have a similar tendency. The presence of this insert offers a higher thermal performance factor as compared to that obtained with a plain tube. Vortex development in the flow structure aids in generating a vortex flow, which increases convective heat transfer. In addition, as the angle is varied, it is observed that the largest attack angle provides the highest thermal performance factor. The greatest increase in the Nusselt number and friction factor, respectively, was found to be approximately 3.7 and 10 times greater than those of a smooth tube. Through numerical simulations with the present simulation condition, it is revealed that the thermal performance factor approaches the value of 1.1. Moreover, the numerical and experimental values agree well although they tend to be different at high Reynolds number conditions. The numerical and experimental values both show similar trends in the Nusselt number, friction factor, and thermal performance factor.

Suggested Citation

  • Agung Tri Wijayanta & Muhammad Aziz & Keishi Kariya & Akio Miyara, 2018. "Numerical Study of Heat Transfer Enhancement of Internal Flow Using Double-Sided Delta-Winglet Tape Insert," Energies, MDPI, vol. 11(11), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:3170-:d:183129
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    References listed on IDEAS

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    1. Evangelos Bellos & Christos Tzivanidis, 2018. "Enhancing the Performance of Evacuated and Non-Evacuated Parabolic Trough Collectors Using Twisted Tape Inserts, Perforated Plate Inserts and Internally Finned Absorber," Energies, MDPI, vol. 11(5), pages 1-28, May.
    2. Yuan Xue & Zhihua Ge & Xiaoze Du & Lijun Yang, 2018. "On the Heat Transfer Enhancement of Plate Fin Heat Exchanger," Energies, MDPI, vol. 11(6), pages 1-18, May.
    3. Sheikholeslami, M. & Ganji, D.D., 2016. "Heat transfer enhancement in an air to water heat exchanger with discontinuous helical turbulators; experimental and numerical studies," Energy, Elsevier, vol. 116(P1), pages 341-352.
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    Cited by:

    1. Junjie Zhao & Bin Zhang & Xiaoli Fu & Shenglin Yan, 2021. "Numerical Study on the Influence of Vortex Generator Arrangement on Heat Transfer Enhancement of Oil-Cooled Motor," Energies, MDPI, vol. 14(21), pages 1-17, October.
    2. Gan Liu & Chen Yang & Junhui Zhang & Huaizhi Zong & Bing Xu & Jin-yuan Qian, 2020. "Internal Flow Analysis of a Heat Transfer Enhanced Tube with a Segmented Twisted Tape Insert," Energies, MDPI, vol. 13(1), pages 1-16, January.
    3. Agung Tri Wijayanta & Pranowo & Mirmanto & Budi Kristiawan & Muhammad Aziz, 2019. "Internal Flow in an Enhanced Tube Having Square-cut Twisted Tape Insert," Energies, MDPI, vol. 12(2), pages 1-12, January.
    4. Arnut Phila & Chinaruk Thianpong & Smith Eiamsa-ard, 2019. "Influence of Geometric Parameters of Alternate Axis Twisted Baffles on the Local Heat Transfer Distribution and Pressure Drop in a Rectangular Channel Using a Transient Liquid Crystal Technique," Energies, MDPI, vol. 12(12), pages 1-25, June.
    5. Piotr Bogusław Jasiński & Michał Jan Kowalczyk & Artur Romaniak & Bartosz Warwas & Damian Obidowski & Artur Gutkowski, 2021. "Investigation of Thermal-Flow Characteristics of Pipes with Helical Micro-Fins of Variable Height," Energies, MDPI, vol. 14(8), pages 1-18, April.

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