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ADDITIONAL TECHNICAL PAPERS

Effects of Inclination Angle of Ribs on the Flow Behavior in Rectangular Ducts

[+] Author and Article Information
Xiufang Gao, Bengt Sundén

Division of Heat Transfer, Lund Institute of Technology, Box 118, 221 00 Lund, Sweden

J. Fluids Eng 126(4), 692-699 (Sep 10, 2004) (8 pages) doi:10.1115/1.1778715 History: Received November 18, 2003; Revised February 12, 2004; Online September 10, 2004
Copyright © 2004 by ASME
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References

Figures

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Sketch of the experimental setup
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Definition of the coordinate system
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Laser sheet locations for PIV measurements
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Velocity vectors and component isolines of 30 deg ribs
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Velocity vectors and component isolines in planes A and B of 90 deg ribs: (a) time-averaged velocity vectors in plane A near wall A (z/c=+0.9); (b) instantaneous velocity vectors in plane A close to the top wall (z/c=+0.9); (c) time-averaged velocity vectors (z/c=+0.9); (d) normalized U velocity component U/Um of (c); (e) time-averaged vectors in symmetry plane in plane B (y/b=0); (f) scale-up of the vortex in plane (e); (g) normalized U velocity component U/Um of (e); (h) normalized W velocity component W/Um of (e)
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Velocity vectors and component isolines in plane A of 60 deg ribs: (a) near wall A (z/c=+0.9); (b) velocity vectors at z/c=0, U subtracted by mean velocity Um at transverse center; (c) normalized velocity component V at three intersection lines; (d) schematic secondary flow; (e) an arbitrary sample of the instantaneous velocity field in the middle part of plane A (z/c=+0.9); (f) time-averaged vector field (z/c=+0.9); (g) normalized U velocity component U/Um of (e); (h) normalized V velocity component V/Um of (e)
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Velocity isolines of U and W components in plane B of 60 deg ribs
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Velocity vectors and component isolines of 45 deg ribs

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