Heat transfer augmentation along the tube wall of a louvered fin heat exchanger using practical delta winglets

Michael J. Lawson, Karen A. Thole

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Delta winglets are known to induce the formation of streamwise vortices and increase heat transfer between a working fluid and the surface on which the winglets are placed. This study investigates the use of delta winglets to augment heat transfer on the tube surface of louvered fin heat exchangers. It is shown that delta winglets placed on louvered fins produce augmentations in heat transfer along the tube wall as high as 47% with a corresponding increase of 19% in pressure losses. Manufacturing constraints are considered in this study whereby piercings in the louvered fins resulting from stamping the winglets into the louvered fins are simulated. Comparisons of measured heat transfer coefficients with and without piercings indicate that piercings reduce average heat transfer augmentations, but significant increases still occur with respect to no winglets present.

Original languageEnglish (US)
Pages (from-to)2346-2360
Number of pages15
JournalInternational Journal of Heat and Mass Transfer
Volume51
Issue number9-10
DOIs
StatePublished - May 1 2008

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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