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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

Author

Listed:
  • Saadah Ahmad

    (Faculty of Engineering and Built Environment, National University of Malaysia, Bangi 43600 UKM, Malaysia)

  • Shahrir Abdullah

    (Faculty of Engineering and Built Environment, National University of Malaysia, Bangi 43600 UKM, Malaysia)

  • Kamaruzzaman Sopian

    (Solar Energy Research Institute (SERI), National University of Malaysia, Bangi 43600 UKM, Malaysia)

Abstract

The simultaneous use of two passive methods (twisted tape and a nanofluid) in a heat transfer system will increase the average Nusselt number ( Nu ) of the system. However, the presence of inserts and nanoparticles inside the tube will create higher pressure drop ( ΔP ) in the system, which can eventually affect the overall enhancement ratio ( η ), especially at higher Reynolds numbers ( Re ). Several modifications of twisted tapes have been made to reduce ΔP , but most showed a decreasing trend of η as Re increased. The objective of this study is to design a new geometry of twisted tape that yields a larger value of Nu and a smaller value of ΔP, which can result in a larger value of η especially at higher Re . A simulation and experimental analysis are conducted in which Re ranges from 4000–16,000 with two types of nanofluids (SiC/Water and Al 2 O 3 /Water) at various values of the volume fraction, ( φ) (1–3%). ANSYS FLUENT software with the RNG k-ɛ turbulent model is adopted for the simulation analysis. Three types of twisted tape are used in the analysis: classic twisted tape with a pitch ratio of 2 (TT PR2), constant-increasing-pitch-ratio twisted tape (TT IPR) and constant-decreasing-pitch-ratio twisted tape (TT DPR). The use of TT IPR generates a stronger swirling flow at the inlet of the tube and smaller ∆P , especially near the outlet region. The highest value of η is obtained for 3% SiC/Water nanofluid that is flowing through a smooth circular tube with TT IPR inserts at Re of 10,000.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:8:p:2095-:d:348857
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    References listed on IDEAS

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    1. Ebrahimi, Amin & Rikhtegar, Farhad & Sabaghan, Amin & Roohi, Ehsan, 2016. "Heat transfer and entropy generation in a microchannel with longitudinal vortex generators using nanofluids," Energy, Elsevier, vol. 101(C), pages 190-201.
    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. Godson, Lazarus & Raja, B. & Mohan Lal, D. & Wongwises, S., 2010. "Enhancement of heat transfer using nanofluids--An overview," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(2), pages 629-641, February.
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    Cited by:

    1. Mohamed Iqbal Shajahan & Jee Joe Michael & M. Arulprakasajothi & Sivan Suresh & Emad Abouel Nasr & H. M. A. Hussein, 2020. "Effect of Conical Strip Inserts and ZrO 2 /DI-Water Nanofluid on Heat Transfer Augmentation: An Experimental Study," Energies, MDPI, vol. 13(17), pages 1-24, 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. Gianpiero Colangelo & Marco Milanese & Giuseppe Starace & Arturo de Risi, 2023. "Advances in the Development of New Heat Transfer Fluids Based on Nanofluids," Energies, MDPI, vol. 16(2), pages 1-3, January.

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