The Effects of Gap Position in Discrete Ribs on Local Heat/Mass Transfer in a Square Duct

Hyung Hee Cho, Y. Y. Kim, D. H. Rhee, S. Y. Lee, S. J. Wu, C. Choi

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Local heat/mass transfer measurements are conducted to investigate the effects of rib arrangements and gap positions on the discrete rib. The combined effects of the gap flows of the discrete ribs and secondary flows are examined in order to promote uniformity of heat/mass transfer distributions, as well as to augment heat/mass transfer. A square channel with rectangular ribs is used for the stationary duct test. The rib-to-rib pitch to the rib height ratio is 8, and the rib attack angle is 60°. The gap width is the same as the rib width, and two gap positions, which are upstream and downstream gaps, are examined with parallel and cross rib arrangements. A naphthalene sublimation method is used to measure local heat/mass transfer coefficients. With the angled discrete ribs, the heat transfer on the surface is enhanced and the uniformity of the heat transfer coefficients is promoted because the gap flow promotes local turbulence and flow mixing near the ribbed surface, while the rib-induced secondary flow is maintained in a duct. The discrete rib arrangements with downstream gaps show better cooling performance than continuous rib or discrete rib arrangements with upstream gaps.

Original languageEnglish
Pages (from-to)287-300
Number of pages14
JournalJournal of Enhanced Heat Transfer
Volume10
Issue number3
DOIs
Publication statusPublished - 2003 Jul 1

Fingerprint

ducts
Ducts
mass transfer
Mass transfer
heat
Secondary flow
secondary flow
Sublimation
Naphthalene
Heat transfer coefficients
upstream
Turbulence
Heat transfer
Cooling
Hot Temperature
heat transfer coefficients
sublimation
naphthalene
attack
heat transfer

All Science Journal Classification (ASJC) codes

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

Cite this

Cho, Hyung Hee ; Kim, Y. Y. ; Rhee, D. H. ; Lee, S. Y. ; Wu, S. J. ; Choi, C. / The Effects of Gap Position in Discrete Ribs on Local Heat/Mass Transfer in a Square Duct. In: Journal of Enhanced Heat Transfer. 2003 ; Vol. 10, No. 3. pp. 287-300.
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The Effects of Gap Position in Discrete Ribs on Local Heat/Mass Transfer in a Square Duct. / Cho, Hyung Hee; Kim, Y. Y.; Rhee, D. H.; Lee, S. Y.; Wu, S. J.; Choi, C.

In: Journal of Enhanced Heat Transfer, Vol. 10, No. 3, 01.07.2003, p. 287-300.

Research output: Contribution to journalArticle

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