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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Grahic Jump Location
Variation of time-scale-ratio, R, in DNS channel flow (a) and in a square duct (b)
Grahic Jump Location
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.
Grahic Jump Location
The calculated turbulent Prandtl number in comparison with the experiments of Hirota et al. 8
Grahic Jump Location
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.
Grahic Jump Location
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.
Grahic Jump Location
Prandtl number variation in a trapezoidal straight duct (a) and in a rectangular straight duct (b). The molecular Prandtl number is 0.72.
Grahic Jump Location
Ducts under consideration
Grahic Jump Location
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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