Investigation of a Two-Equation Turbulent Heat Transfer Model Applied to Ducts

[+] Author and Article Information
Masoud Rokni, Bengt Sundén

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

J. Heat Transfer 125(1), 194-200 (Jan 29, 2003) (7 pages) doi:10.1115/1.1532017 History: Received December 27, 2001; Revised September 25, 2002; Online January 29, 2003
Copyright © 2003 by ASME
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Ducts under consideration
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Calculated main flow velocity and Reynolds stresses compared with experiment (Rokni et al. 19) at centerline in a rectangular duct with aspect ratio 8. Re=5800.
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Variation of time-scale-ratio, R, in DNS channel flow (a) and in a square duct (b)
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Turbulent Prandtl number variation in the cross section of a square duct for two different Reynolds numbers (a) 6770, and (b) 64350. The molecular Prandtl number is 0.72.
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The calculated turbulent Prandtl number in comparison with the experiments of Hirota et al. 8
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Contours of turbulent diffusivity in a square duct at two different Reynolds numbers (a) 6770 and (b) 64350. The values are times 10−3, e.g., 2.89604×10−3 m2/s.
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Turbulent Prandtl number variation (a) and turbulent diffusivity variation (b) in a square duct with oil flow. The diffusivity values are times 10−3, e.g., 6.96916×10−3 m2/s.Pr=471 and Re=6990.
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Prandtl number variation in a trapezoidal straight duct (a) and in a rectangular straight duct (b). The molecular Prandtl number is 0.72.




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