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Effects of inclination angle of ribs on the flow behavior in rectangular ducts

Gao, Xiufang LU and Sundén, Bengt LU (2004) In Journal of Fluids Engineering 126(4). p.692-699
Abstract
The flow behavior in rib-roughened ducts is influenced by the inclination of ribs and the effect is investigated in the present study by Particle Image Velocimetry (PIV). The local flow structures between two adjacent ribs were measured. The Reynolds number was fixed at 5800. The flow field description was based on the PIV results in planes both parallel and perpendicular to the ribbed walls at various locations. The rib angle to the main flow direction was varied as 30 deg, 45 deg, 60 deg and 90 deg. The ribs induce three dimensional flow fields. The flow separation and reattachment between adjacent ribs are clearly observed. In addition, the inclined ribs are found to alter the spanwise distribution of the streamwise velocity component.... (More)
The flow behavior in rib-roughened ducts is influenced by the inclination of ribs and the effect is investigated in the present study by Particle Image Velocimetry (PIV). The local flow structures between two adjacent ribs were measured. The Reynolds number was fixed at 5800. The flow field description was based on the PIV results in planes both parallel and perpendicular to the ribbed walls at various locations. The rib angle to the main flow direction was varied as 30 deg, 45 deg, 60 deg and 90 deg. The ribs induce three dimensional flow fields. The flow separation and reattachment between adjacent ribs are clearly observed. In addition, the inclined ribs are found to alter the spanwise distribution of the streamwise velocity component. The streamwise velocity component has its highest values at the upstream end of the ribs, and decreases continuously to its lowest values at the downstream end. Strong secondary flow motion occurs over the entire duct cross section for the inclined ribs. The flow structures between two consecutive ribs show that the fluid flows along the ribs from one end of the ribs to the other end, and then turns back at the transverse center Downwash and upwash flows are observed at the upstream end and downstream end of the ribs, respectively. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Fluids Engineering
volume
126
issue
4
pages
692 - 699
publisher
American Society Of Mechanical Engineers (ASME)
external identifiers
  • wos:000224222900023
  • scopus:11144343199
ISSN
0098-2202
DOI
10.1115/1.1778715
language
English
LU publication?
yes
id
7da8788e-09a7-460a-b621-326e05ca47e8 (old id 265350)
date added to LUP
2007-10-26 12:54:59
date last changed
2017-12-10 04:38:23
@article{7da8788e-09a7-460a-b621-326e05ca47e8,
  abstract     = {The flow behavior in rib-roughened ducts is influenced by the inclination of ribs and the effect is investigated in the present study by Particle Image Velocimetry (PIV). The local flow structures between two adjacent ribs were measured. The Reynolds number was fixed at 5800. The flow field description was based on the PIV results in planes both parallel and perpendicular to the ribbed walls at various locations. The rib angle to the main flow direction was varied as 30 deg, 45 deg, 60 deg and 90 deg. The ribs induce three dimensional flow fields. The flow separation and reattachment between adjacent ribs are clearly observed. In addition, the inclined ribs are found to alter the spanwise distribution of the streamwise velocity component. The streamwise velocity component has its highest values at the upstream end of the ribs, and decreases continuously to its lowest values at the downstream end. Strong secondary flow motion occurs over the entire duct cross section for the inclined ribs. The flow structures between two consecutive ribs show that the fluid flows along the ribs from one end of the ribs to the other end, and then turns back at the transverse center Downwash and upwash flows are observed at the upstream end and downstream end of the ribs, respectively.},
  author       = {Gao, Xiufang and Sundén, Bengt},
  issn         = {0098-2202},
  language     = {eng},
  number       = {4},
  pages        = {692--699},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  series       = {Journal of Fluids Engineering},
  title        = {Effects of inclination angle of ribs on the flow behavior in rectangular ducts},
  url          = {http://dx.doi.org/10.1115/1.1778715},
  volume       = {126},
  year         = {2004},
}