The combined effects of rib arrangemets and discrete ribs on local heat/mass transfer in a square duct

H. H. Cho, S. Y. Lee, S. J. Wu

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

22 Citations (Scopus)

Abstract

Local heat/mass transfer and friction loss in a square duct roughened with various types of continuous and discrete rib tabulators are investigated. The combined effects of the gap flows of the discrete ribs and the secondary flows are examined for the purpose of the reduction of thermally weak regions and the promotion of the uniformity of heat/mass transfer distributions as well as the augmentation of average heat/mass transfer. The rib-to-rib pitch to the rib height ratio (p/e) of 8 and the rib angles of 90 and 60 deg are selected with e/Dh,=0.08. The vortical structure of the secondary flows induced by the parallel angled arrays are quite distinct from that induced by the cross angled arrays. This distinction influences on heat/mass transfer and friction loss in all the tested cases. The gap flows of the discrete ribs reduce the strength of the secondary flows but promote local turbulence and flow mixing. As a result, the fairly uniform heat/mass transfer distributions are obtained with two row gaps.

Original languageEnglish
Title of host publicationHeat Transfer; Electric Power; Industrial and Cogeneration
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Print)9780791878521
DOIs
Publication statusPublished - 2001 Jan 1
EventASME Turbo Expo 2001: Power for Land, Sea, and Air, GT 2001 - New Orleans, LA, United States
Duration: 2001 Jun 42001 Jun 7

Publication series

NameProceedings of the ASME Turbo Expo
Volume3

Other

OtherASME Turbo Expo 2001: Power for Land, Sea, and Air, GT 2001
CountryUnited States
CityNew Orleans, LA
Period01/6/401/6/7

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Cho, H. H., Lee, S. Y., & Wu, S. J. (2001). The combined effects of rib arrangemets and discrete ribs on local heat/mass transfer in a square duct. In Heat Transfer; Electric Power; Industrial and Cogeneration (Proceedings of the ASME Turbo Expo; Vol. 3). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/2001-GT-0175