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TECHNICAL PAPERS

Rotating Effect on Fluid Flow in Two Smooth Ducts Connected by a 180-Degree Bend

[+] Author and Article Information
Tong-Miin Liou

College of Engineering, Feng Chia University, Taichung, Taiwan, ROC

Chung-Chu Chen

Microsystem Laboratory, Industrial Technology Research Institute, Hsin-Chu, Taiwan, ROC e-mail: 890079@itri.org.tw

Meng-Yu Chen

Department of Power Mechanical Engineering, National Tsing Hua University, Hsin-Chu, Taiwan, ROCe-mail: d853708@oz.nthu.edu.tw

J. Fluids Eng 125(1), 138-148 (Jan 22, 2003) (11 pages) doi:10.1115/1.1522413 History: Received March 01, 2000; Revised June 17, 2002; Online January 22, 2003
Copyright © 2003 by ASME
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References

Liou,  T. M., and Chen,  C. C., 1997, “LDV Study of Developing Flows Through a Smooth Duct With 180-Deg Straight-Corner Turn,” ASME J. Turbomach., 121, pp. 167–174.
Wagner,  J. H., Johnson,  B. V., and Hajek,  T. J., 1991a, “Heat Transfer in Rotating Serpentine Passages With Smooth Walls,” ASME J. Turbomach., 113, pp. 321–330.
Wagner,  J. H., Johnson,  B. V., and Kopper,  F. C., 1991, “Heat Transfer in Rotating Passages With Smooth Walls and Radial Outward Flow,” ASME J. Turbomach., 113, pp. 42–51.
Han,  J. C., and Zhang,  Y. M., 1992, “Effect of Uneven Wall Temperature on Local Heat Transfer in a Rotating Square Channel With Smooth Walls and Radial Outward Flow,” ASME J. Heat Transfer, 114, pp. 850–858.
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Figures

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Sketch of configuration, coordinate system, and dimensions of test section
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Schematic drawing of overall experimental system
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Streamwise mean velocity and turbulence intensity profiles at X*=10 station of the first pass in the (a) Z*=−0.5 and (b) Y*=0 planes for Re=10,000 and Ro=0
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Streamwise mean velocity and turbulence intensity profiles at X*=10 station of the first pass in the Z*=−0.5 plane for Re=10,000 with various Ro
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Evolution of streamwise mean velocity profile in the Z*=±0.50 planes of the first and second passes for (a) Ro=0 (Liou et al., 20) and (b) Ro=0.05
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Radially inward evolution of U/Ub profile within 2DH immediately after the turn for (a) Ro=0.08 and (b) Ro=0.15
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Variation of separation bubble length with rotation number
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(a) Spanwise variations of streamwise mean velocity and turbulence intensity profiles in the first pass for Ro=0.15. (b) Spanwise variations of streamwise mean velocity and turbulence intensity profiles in the second pass for Ro=0.15.
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Variation of dimensionless wall static pressure with X*
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Cross-stream secondary flow patterns in the midturn (Z**=0) for (a) Ro=0, (b) Ro=0.08, and Ro=0.15 at Re=10,000 (view from downstream side)
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Flow patterns of two cross sections (Z*=−0.5 and Z*=0.5) inside the turn for Ro=0.08 and Ro=0.15 at Re=10,000 (view from downstream side)
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Dimensionless turbulent kinetic energy contours of three cross sections (Z*=−0.5,Z**=0, and Z*=0.5) inside the turn for Ro=0.08 and Ro=0.15 at Re=10,000 (view from downstream side)
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Variation of Nusselt number ratio, dimensionless skewness index, magnitude of secondary-flow velocity, and turbulent kinetic energy with Ro for Re=104
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Effects of rotation on radial distributions of Nu/Nu0,k/Ub2,|U|/Ub, and V/Ub at Z**=0 for Re=10,000 (LDV measurements performed at 2-mm distance away from the leading (Y*=−1) or trailing (Y*=1) walls)

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