Pressure drop and thermal performance in rotating two-pass ducts with various cross rib arrangements

Kyung Min Kim, Dong Hyun Lee, Hyung Hee Cho

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The present study investigates the pressure drop characteristics of rotating two-pass ducts. The duct has an aspect ratio (W/H) of 0.5 and a hydraulic diameter (D h ) of 26.67 mm. Rib turbulators are attached in the four different cross arrangements on the leading and trailing surfaces of the test ducts. The ribs have a rectangular cross section of 2 mm (e) × 3 mm (w) and a rib angle-of-attack of 70°. The pitch-to-rib-height ratio (p/e) is 7.5 and the rib-height-to-hydraulic-diameter ratio (e/D h ) is 0.075. The measured results for each region show that the highest pressure drop appears in the turning region in the stationary case, but appears in the upstream region of the second pass in the rotating case. The heat transfer and the pressure coefficients in the first pass are similar for the stationary and rotating cases in all the tested rib arrangements. After the turning region, however, the heat transfer and pressure drop are high in the cases with the cross NN- and PP-type ribs in the stationary ducts. In the rotating ducts, they are high in the cases with the cross NP- and PP-type ribs.

Original languageEnglish
Pages (from-to)913-919
Number of pages7
JournalHeat and Mass Transfer/Waerme- und Stoffuebertragung
Volume44
Issue number8
DOIs
Publication statusPublished - 2008 Jun 1

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pressure drop
ducts
Ducts
Pressure drop
hydraulics
heat transfer
Hydraulics
Heat transfer
angle of attack
Angle of attack
upstream
aspect ratio
Aspect ratio
Hot Temperature
cross sections
coefficients

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

Cite this

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Pressure drop and thermal performance in rotating two-pass ducts with various cross rib arrangements. / Kim, Kyung Min; Lee, Dong Hyun; Cho, Hyung Hee.

In: Heat and Mass Transfer/Waerme- und Stoffuebertragung, Vol. 44, No. 8, 01.06.2008, p. 913-919.

Research output: Contribution to journalArticle

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