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Heat Transfer Intensification in a Heat Exchanger by Means of Twisted Tapes in Rib and Sawtooth Forms

Author

Listed:
  • Pasu Poonpakdee

    (School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand)

  • Boonsong Samutpraphut

    (Department of Mechanical Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand)

  • Chinaruk Thianpong

    (School of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand)

  • Suriya Chokphoemphun

    (Department of Mechanical Engineering, Faculty of Industry and Technology, Rajamangala University of Technology Isan Sakonnakhon Campus, Sakonnakhon 47160, Thailand)

  • Smith Eiamsa-ard

    (Department of Mechanical Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand
    Division of System Engineering, Graduate School of Engineering, Mie University, Tsu 514-8507, Mie, Japan)

  • Naoki Maruyama

    (Division of Mechanical Engineering, Graduate School of Engineering, Mie University, Tsu 514-8507, Mie, Japan
    Engineering Innovation Unit, Graduate School of Regional Innovation Studies, Mie University, Tsu 514-8507, Mie, Japan)

  • Masafumi Hirota

    (Division of Mechanical Engineering, Graduate School of Engineering, Mie University, Tsu 514-8507, Mie, Japan)

Abstract

This experimental study aimed to intensify the aerothermal performance index ( API ) in a round tube heat exchanger employing twisted tapes in rib and sawtooth forms (TTRSs) as swirl/vortex flow generators. The TTRSs have a constant twist ratio of 3.0, a constant rib pitch ratio ( p/e ) of 1.0, and six different sawtooth angles ( α = 20°, 30°, 40°, 50°, 60°, and 70°). Experiments were carried out in an open flow using air as the working fluid for Reynolds numbers between 6000 and 20,000 in the current study, which was conducted in a heated tube under conditions of uniform wall heat flux. A typical twisted tape (TT) was also tested for comparison. The experimental results suggest that TTRSs yield Nusselt numbers ranging from 1.42 to 2.10 times of those of a plain tube. TTRSs with larger sawtooth angles ( α ) offer superior heat transfer. The TTRSs with α = 20°, 30°, 40°, 50°, 60°, and 70° respectively, enhance average Nusselt numbers by 158%, 162%, 166%, 172%, 180%, and 187% with average friction factors of 3.51, 3.55, 3.60, 3.67, 3.75 and 3.82 times higher than a plain tube. Additionally, TTRSs with sawtooth angles ( α ) of 20°, 30°, 40°, 50°, 60°, and 70° offer APIs in the ranges of 0.99 to 1.19, 1.01 to 1.21, 1.03 to 1.26, 1.05 to 1.31, 1.07 to 1.42, and 1.09 to 1.48, respectively, which are higher than those of the typical twisted tape (TT) by around 5%, 7%, 11%, 16%, 25%, and 31%, respectively. This demonstrates that twisted tapes in rib and sawtooth form (TTRSs), with appropriate geometries, give a promising trade-off between enhanced heat transfer and an increased friction loss penalty.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:23:p:8855-:d:982072
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    References listed on IDEAS

    as
    1. 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.
    2. Seyed Soheil Mousavi Ajarostaghi & Mohammad Zaboli & Hossein Javadi & Borja Badenes & Javier F. Urchueguia, 2022. "A Review of Recent Passive Heat Transfer Enhancement Methods," Energies, MDPI, vol. 15(3), pages 1-60, 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. Saadah Ahmad & Shahrir Abdullah & Kamaruzzaman Sopian, 2020. "Numerical and Experimental Analysis of the Thermal Performances of SiC/Water and Al 2 O 3 /Water Nanofluid Inside a Circular Tube with Constant-Increased-PR Twisted Tape," Energies, MDPI, vol. 13(8), pages 1-24, April.
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    1. Prachya Samruaisin & Rangsan Maza & Chinaruk Thianpong & Varesa Chuwattanakul & Naoki Maruyama & Masafumi Hirota & Smith Eiamsa-ard, 2023. "Enhanced Heat Transfer of a Heat Exchanger Tube Installed with V-Shaped Delta-Wing Baffle Turbulators," Energies, MDPI, vol. 16(13), pages 1-23, July.

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