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Enhanced Heat Transfer of a Heat Exchanger Tube Installed with V-Shaped Delta-Wing Baffle Turbulators

Author

Listed:
  • Prachya Samruaisin

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

  • Rangsan Maza

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

  • Chinaruk Thianpong

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

  • Varesa Chuwattanakul

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

  • Naoki Maruyama

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

  • Masafumi Hirota

    (Department of Mechanical Engineering, Faculty of Engineering, Aichi Institute of Technology, Toyota 470-0392, Aichi, Japan)

  • Smith Eiamsa-ard

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

Abstract

The influences of V-shaped delta-wing baffles on the thermohydraulic performance characteristics in a round tube were experimentally tested. The V-shaped delta-wing baffles having a set number of wings ( N = 4, 6, and 8) were comparatively tested. The V-shaped delta-wing baffles with various pitch ratios of P / D = 2.0, 2.5, and 3.0 were thoroughly fitted inside a tube. In the present work, the baffles were responsible for both the recirculation/reverse flow behind the solid baffle and the longitudinal vortex flow behind the V-shaped wing. The V-shaped winged baffles with N = 8 produced high heat transfer rates by promoting the development of reverse and vortex flows. These currents aid in fluid mixing between the two streams. Experimental results suggested that utilizing V-shaped delta-wing baffles having N = 4, 6, and 8 led to Nusselt number enhancement of up to 97–105.6%, 105.8–127.8% and 114.8–138.9%, respectively. When N was 8, the V-shaped wings baffles created additional multi vortex flows, which resulted in some fluid mixing between the vortex and the reverse flow. It was discovered that a greater turbulent intensity is imparted to the flow that was occurring between the V-shaped delta-wing baffles, which led to an increase in the rate of heat transfer when the pitch ratio was decreased. The increase in Nusselt number was up to 118.26–151.3% more than it was in a tube with the lowest pitch ratio ( P / D = 2.0). It was also found that the baffles with N = 8 wings and P / D = 3.0 offered a maximum aerothermal performance factor (APF) of 1.01. Furthermore, the V-shaped delta-wing baffles have the potential for energy savings at low Re ≤ 6000, indicated by the APF beyond unity.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:13:p:5237-:d:1189374
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    References listed on IDEAS

    as
    1. Yakut, Kenan & Sahin, Bayram & Canbazoglu, Suat, 2004. "Performance and flow-induced vibration characteristics for conical-ring turbulators," Applied Energy, Elsevier, vol. 79(1), pages 65-76, September.
    2. 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.
    3. 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.
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