Droplet and retained condensate effects on local convective heat transfer for annularly-finned tubes in cross flow

X. Hu, L. Zhang, Anthony M Jacobi

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

Abstract

In many heat exchanger applications droplets or retained condensate, acting essentially as surface irregularities, have an influence on the local and spatially-averaged heat transfer behavior. Previous studies have reported an enhanced performance under these circumstances, but the mechanism and true impact of the enhancement remain unclear for finned-tube applications. From mass transfer experiments with simulated condensate, we have inferred the surface irregularity impact on heat transfer and fin efficiency. An enhancement in spatially-averaged behavior as high as 33% over dry fin behavior was found, and true fin efficiencies were found to be as much as 13% below the Gardner (uniform heat transfer coefficient) fin efficiencies. Flow and heat transfer appear to be significantly affected by small horseshoe vortices associated with the droplets or surface irregularities.

Original languageEnglish (US)
Title of host publicationInstitution of Chemical Engineers Symposium Series
PublisherPubl by Inst of Chemical Engineers
Pages261-247
Number of pages15
Edition129
ISBN (Print)0852952821
StatePublished - Dec 1 1992
Event3rd UK National Conference incorporating 1st European Conference on Thermal Sciences - Birmingham, Engl
Duration: Sep 16 1992Sep 18 1992

Publication series

NameInstitution of Chemical Engineers Symposium Series
Number129
Volume1
ISSN (Print)0307-0492

Other

Other3rd UK National Conference incorporating 1st European Conference on Thermal Sciences
CityBirmingham, Engl
Period9/16/929/18/92

ASJC Scopus subject areas

  • Chemical Engineering(all)

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