Computational and experimental comparison of tube wall heat transfer augmented by winglets in louvered fin heat exchangers

Michael J. Lawson, Paul Sanders, Karen Ann Thole

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Louvered fins are used in compact heat exchangers to increase heat transfer by interrupting thermal boundary layer growth thereby increasing the convective heat transfer coefficients and reducing the air side resistance. Recently, it has been experimentally shown that heat transfer along the tube wall can be augmented by the placement of delta winglets on the louvers at an angle to the flow. The focus of this combined experimental and computational study is to determine the effect of realistic winglets on tube wall heat transfer. Comparisons of the computational simulations were made to the experimental results, which were obtained using a twenty times scaled model. Winglet performance characteristics were studied on solid louvers and pierced louvers whereby the latter simulates what would occur for a manufactured louver having a winglet. For a solid louver having a winglet, the tube wall heat transfer augmentation was found to be as high as 5.4%. Pierced louver cases were observed to produce slightly higher heat transfer augmentations than solid louver cases. Computational results suggest that the mechanism behind tube wall heat transfer augmentation is flow redirection and not winglet induced vortices.

    Original languageEnglish (US)
    Title of host publicationProceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Heat Transfer
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Print)0791837904, 9780791837900
    DOIs
    StatePublished - Jan 1 2006
    Event2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Chicago, IL, United States
    Duration: Nov 5 2006Nov 10 2006

    Publication series

    NameAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
    ISSN (Print)0272-5673

    Other

    Other2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006
    CountryUnited States
    CityChicago, IL
    Period11/5/0611/10/06

    Fingerprint

    Heat exchangers
    Heat transfer
    Heat transfer coefficients
    Boundary layers
    Vortex flow
    Air
    Hot Temperature

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Fluid Flow and Transfer Processes

    Cite this

    Lawson, M. J., Sanders, P., & Thole, K. A. (2006). Computational and experimental comparison of tube wall heat transfer augmented by winglets in louvered fin heat exchangers. In Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Heat Transfer (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2006-14452
    Lawson, Michael J. ; Sanders, Paul ; Thole, Karen Ann. / Computational and experimental comparison of tube wall heat transfer augmented by winglets in louvered fin heat exchangers. Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Heat Transfer. American Society of Mechanical Engineers (ASME), 2006. (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD).
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    abstract = "Louvered fins are used in compact heat exchangers to increase heat transfer by interrupting thermal boundary layer growth thereby increasing the convective heat transfer coefficients and reducing the air side resistance. Recently, it has been experimentally shown that heat transfer along the tube wall can be augmented by the placement of delta winglets on the louvers at an angle to the flow. The focus of this combined experimental and computational study is to determine the effect of realistic winglets on tube wall heat transfer. Comparisons of the computational simulations were made to the experimental results, which were obtained using a twenty times scaled model. Winglet performance characteristics were studied on solid louvers and pierced louvers whereby the latter simulates what would occur for a manufactured louver having a winglet. For a solid louver having a winglet, the tube wall heat transfer augmentation was found to be as high as 5.4{\%}. Pierced louver cases were observed to produce slightly higher heat transfer augmentations than solid louver cases. Computational results suggest that the mechanism behind tube wall heat transfer augmentation is flow redirection and not winglet induced vortices.",
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    Lawson, MJ, Sanders, P & Thole, KA 2006, Computational and experimental comparison of tube wall heat transfer augmented by winglets in louvered fin heat exchangers. in Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Heat Transfer. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, American Society of Mechanical Engineers (ASME), 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006, Chicago, IL, United States, 11/5/06. https://doi.org/10.1115/IMECE2006-14452

    Computational and experimental comparison of tube wall heat transfer augmented by winglets in louvered fin heat exchangers. / Lawson, Michael J.; Sanders, Paul; Thole, Karen Ann.

    Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Heat Transfer. American Society of Mechanical Engineers (ASME), 2006. (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    Lawson MJ, Sanders P, Thole KA. Computational and experimental comparison of tube wall heat transfer augmented by winglets in louvered fin heat exchangers. In Proceedings of 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006 - Heat Transfer. American Society of Mechanical Engineers (ASME). 2006. (American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD). https://doi.org/10.1115/IMECE2006-14452