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Internal Flow Analysis of a Heat Transfer Enhanced Tube with a Segmented Twisted Tape Insert

Author

Listed:
  • Gan Liu

    (State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China)

  • Chen Yang

    (Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China)

  • Junhui Zhang

    (State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China)

  • Huaizhi Zong

    (State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China)

  • Bing Xu

    (State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China)

  • Jin-yuan Qian

    (Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

A heat exchanger is a device that transfers unneeded heat from one region to another, and transferred heat may be fully reused, thus improving energy efficiency. To augment this positive process, many studies and investigations on automation technologies have been performed. Inserts are widely used in pipe flow for heat transfer enhancement, since they can break the boundary layer and promote the heat exchange. Segmented twisted tape, which is applicable in 3D printing, is a novel insert and has potential in heat transfer enhancement. To clarify its advantages and disadvantages, this research presents a numerical investigation of vortex flow and heat enhancement in pipes containing one segmented twisted element. Flow state and heat transfer behaviour are obtained by simulation under constant wall temperature with different Reynolds numbers, ranging from 10,000 to 35,000. The effects of geometric parameters, including twist ratio ( P/D = 2.0, 3.3 and 4.6) and length ratio ( L/P = 0.3, 0.5 and 0.7), on the Nusselt number ( Nu ) and friction factor ( f ) are investigated. Streamline and temperature distribution are presented. Meanwhile, local and overall heat transfer performance is compared with those of a smooth tube, and the overall performance is evaluated by performance evaluation factor ( η ). The results indicate that the twist ratio ( P/D ) plays a dominant role in heat transfer enhancement while the length ratio ( L/P ) also has considerable influence. It is shown that a segmented tape insert can increase the overall heat transfer rate by 23.5% and the friction factor by 235%, while local improvement along the tube can be 2.8 times more than the plain tube.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:1:p:207-:d:304293
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    References listed on IDEAS

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    1. 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.
    2. Halil Bayram & Gökhan Sevilgen, 2017. "Numerical Investigation of the Effect of Variable Baffle Spacing on the Thermal Performance of a Shell and Tube Heat Exchanger," Energies, MDPI, vol. 10(8), pages 1-19, August.
    3. 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.
    4. 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.
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    Cited by:

    1. Piotr Bogusław Jasiński, 2021. "Numerical Study of Heat Transfer Intensification in a Circular Tube Using a Thin, Radiation-Absorbing Insert. Part 1: Thermo-Hydraulic Characteristics," Energies, MDPI, vol. 14(15), pages 1-18, July.
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    3. Pasu Poonpakdee & Boonsong Samutpraphut & Chinaruk Thianpong & Suriya Chokphoemphun & Smith Eiamsa-ard & Naoki Maruyama & Masafumi Hirota, 2022. "Heat Transfer Intensification in a Heat Exchanger by Means of Twisted Tapes in Rib and Sawtooth Forms," Energies, MDPI, vol. 15(23), pages 1-17, November.
    4. Ching-Jenq Ho & Chau-Yang Huang & Chi-Ming Lai, 2021. "Heat Transfer by Natural Convection in a Square Enclosure Containing PCM Suspensions," Energies, MDPI, vol. 14(10), pages 1-17, May.
    5. Piotr Bogusław Jasiński, 2021. "Numerical Study of Heat Transfer Intensification in a Circular Tube Using a Thin, Radiation-Absorbing Insert. Part 2: Thermal Performance," Energies, MDPI, vol. 14(15), pages 1-18, July.

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