Swirling flows in circular-to-rectangular transition ducts

Jiun-Jih Miau, E. C. Lin, Q. S. Chen, Jung-Hua Chou, Dartzi Pan, C. K. Lin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Swirling flows in three circular-to-rectangular transition ducts, each of them with an aspect ratio of 2.0 at the rectangular exit, have been studied experimentally. The swirling flows were produced by swirlers whose vane angles were at 5°, 10° and 20° inclinded to the incoming flow, respectively. Flow visualization experiments were made at selected cross-sectional planes in the transition ducts. Pressure and velocity measurements were obtained on the contoured duct walls and at the rectangular exit planes, respectively. The results show that the swirling flow pattern evolves into a skewed structure at the exit plane which, in connection with the wall pressure distributions, is asymmetric with respect to the centerline of either the top and bottom walls or the side walls. Moreover, an analysis based on the mean streamwise vorticity equation with the velocity data obtained immediately downstream of the rectangular exit plane indicates that the cross-stream Reynolds stress plays an important role in transporting the streamwise vorticity of the swirling flow into the surrounding fluid.

Original languageEnglish
Pages (from-to)401-409
Number of pages9
JournalExperiments in Fluids
Volume20
Issue number6
DOIs
Publication statusPublished - 1996 Apr 1

Fingerprint

Swirling flow
swirling
ducts
Ducts
Vorticity
vorticity equations
wall pressure
vanes
flow visualization
Reynolds stress
Flow visualization
pressure measurement
Pressure measurement
velocity measurement
pressure distribution
Pressure distribution
Velocity measurement
Flow patterns
vorticity
aspect ratio

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this

Miau, J-J., Lin, E. C., Chen, Q. S., Chou, J-H., Pan, D., & Lin, C. K. (1996). Swirling flows in circular-to-rectangular transition ducts. Experiments in Fluids, 20(6), 401-409. https://doi.org/10.1007/BF00189378
Miau, Jiun-Jih ; Lin, E. C. ; Chen, Q. S. ; Chou, Jung-Hua ; Pan, Dartzi ; Lin, C. K. / Swirling flows in circular-to-rectangular transition ducts. In: Experiments in Fluids. 1996 ; Vol. 20, No. 6. pp. 401-409.
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Miau, J-J, Lin, EC, Chen, QS, Chou, J-H, Pan, D & Lin, CK 1996, 'Swirling flows in circular-to-rectangular transition ducts', Experiments in Fluids, vol. 20, no. 6, pp. 401-409. https://doi.org/10.1007/BF00189378

Swirling flows in circular-to-rectangular transition ducts. / Miau, Jiun-Jih; Lin, E. C.; Chen, Q. S.; Chou, Jung-Hua; Pan, Dartzi; Lin, C. K.

In: Experiments in Fluids, Vol. 20, No. 6, 01.04.1996, p. 401-409.

Research output: Contribution to journalArticle

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