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Compound Heat Transfer Enhancement of Wavy Fin-and-Tube Heat Exchangers through Boundary Layer Restarting and Swirled Flow

Author

Listed:
  • Ali Sadeghianjahromi

    (Department of Mechanical and Aerospace Engineering, Malek-Ashtar University of Technology, Shahin-shahr, P.O. Box 83145/115, Isfahan, Iran)

  • Saeid Kheradmand

    (Department of Mechanical and Aerospace Engineering, Malek-Ashtar University of Technology, Shahin-shahr, P.O. Box 83145/115, Isfahan, Iran)

  • Hossain Nemati

    (Department of Mechanics, Marvdasht Branch, Islamic Azad University, Marvdasht 73711-13119, Iran)

  • Jane-Sunn Liaw

    (Green Energy & Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan)

  • Chi-Chuan Wang

    (Department of Mechanical Engineering, National Chiao Tung University, EE474, 1001 University Road, Hsinchu 300, Taiwan)

Abstract

This study performs a 3D turbulent flow numerical simulation to improve heat transfer characteristics of wavy fin-and-tube heat exchangers. A compound design encompassing louver, flat, and vortex generator onto wavy fins can significantly enhance the heat transfer performance of wavy fin-and-tube heat exchangers. Replacement of wavy fins around tubes with flat fins is not effective as far as the reduction of thermal resistance is concerned, although an appreciable pressure drop reduction can be achieved. Adding two louvers with a width of 8 mm to the flat portion can reduce thermal resistance up to 6% in comparison with the reference wavy fin. Increasing the louver number and width can further decrease the thermal resistance. Also, it is found that the optimum louver angle is equal to the wavy angle for offering the lowest thermal resistance. Therefore, compound geometry with three louvers, a width of 12 mm, and the louver angle being equal to wavy angle with waffle height to be the same as fin pitch of the reference wavy fin has the most reduction in thermal resistance of 16% for a pumping power of 0.001 W. Adding punching longitudinal vortex generators on this compound geometry can further decrease thermal resistance up to 18%.

Suggested Citation

  • Ali Sadeghianjahromi & Saeid Kheradmand & Hossain Nemati & Jane-Sunn Liaw & Chi-Chuan Wang, 2018. "Compound Heat Transfer Enhancement of Wavy Fin-and-Tube Heat Exchangers through Boundary Layer Restarting and Swirled Flow," Energies, MDPI, vol. 11(8), pages 1-19, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:8:p:1959-:d:160452
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    References listed on IDEAS

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    1. Lotfi, Babak & Sundén, Bengt & Wang, Qiuwang, 2016. "An investigation of the thermo-hydraulic performance of the smooth wavy fin-and-elliptical tube heat exchangers utilizing new type vortex generators," Applied Energy, Elsevier, vol. 162(C), pages 1282-1302.
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    Cited by:

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    2. Sadeghianjahromi, Ali & Wang, Chi-Chuan, 2021. "Heat transfer enhancement in fin-and-tube heat exchangers – A review on different mechanisms," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).
    3. Wan-Ling Hu & Ai-Jun Ma & Yong Guan & Zhi-Jie Cui & Yi-Bo Zhang & Jing Wang, 2021. "Experimental Study of the Air Side Performance of Fin-and-Tube Heat Exchanger with Different Fin Material in Dehumidifying Conditions," Energies, MDPI, vol. 14(21), pages 1-15, October.
    4. Mustansar Hayat Saggu & Nadeem Ahmed Sheikh & Usama Muhammad Niazi & Muhammad Irfan & Adam Glowacz, 2020. "Predicting the Structural Reliability of LNG Processing Plate-Fin Heat Exchanger for Energy Conservation," Energies, MDPI, vol. 13(9), pages 1-22, May.
    5. Hyung Ju Lee & Jaiyoung Ryu & Seong Hyuk Lee, 2019. "Influence of Perforated Fin on Flow Characteristics and Thermal Performance in Spiral Finned-Tube Heat Exchanger," Energies, MDPI, vol. 12(3), pages 1-13, February.
    6. Jingang Yang & Yaohua Zhao & Aoxue Chen & Zhenhua Quan, 2019. "Thermal Performance of a Low-Temperature Heat Exchanger Using a Micro Heat Pipe Array," Energies, MDPI, vol. 12(4), pages 1-16, February.

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