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

Michael J. Lawson, Paul Sanders, Karen A. 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

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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    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