Computations were performed to study the three-dimensional flow and heat transfer in a U-shaped duct of square cross section under rotating and non-rotating conditions. The parameters investigated were two rotation numbers (0, 0.24) and smooth versus ribbed walls at a Reynolds number of 25,000, a density ratio of 0.13, and an inlet Mach number of 0.05. Results are presented for streamlines, velocity vector fields, and contours of Mach number, pressure, temperature, and Nusselt numbers. These results show how fluid flow in a U-duct evolves from a unidirectional one to one with convoluted secondary flows because of Coriolis force, centrifugal buoyancy, staggered inclined ribs, and a 180 deg bend. These results also show how the nature of the fluid flow affects surface heat transfer. The computations are based on the ensemble-averaged conservation equations of mass, momentum (compressible Navier-Stokes), and energy closed by the low Reynolds number SST turbulence model. Solutions were generated by a cell-centered finite-volume method that uses second-order flux-difference splitting and a diagonalized alternating-direction implicit scheme with local time stepping and V-cycle multigrid.
1.
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.3.
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4.
Iacovides, H., Jackson, D. C., Kelemenis, G., and Launder, B. E., 1999, “The Measurement of Local Wall Heat Transfer in Stationary U-Ducts of Strong Curvature, with Smooth and Rib-Roughened Walls,” ASME Paper 99-GT-254.
5.
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, B. V.
, and Hajek
, T. J.
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,” ASME J. Turbomach.
, 113
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, pp. 42
–51
.6.
Wagner
, J. H.
, Johnson
, B. V.
, and Kopper
, F. C.
, 1991
, “Heat Transfer in Rotating Serpentine Passages with Smooth Walls
,” ASME J. Turbomach.
, 113
, No. 3
, pp. 321
–330
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, and Salemi
, R.
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–864
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, J. C.
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, Y. M.
, and Lee
, C. P.
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,” ASME J. Turbomach.
, 116
, No. 1
, pp. 149
–158
.9.
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,” ASME J. Turbomach.
, 113
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.11.
Wagner
, J. H.
, Johnson
, B. V.
, Graziani
, R. A.
, and Yeh
, F. C.
, 1992
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,” ASME J. Turbomach.
, 114
, No. 4
, pp. 847
–857
.12.
Zhang
, N.
, Chiou
, J.
, Fann
, S.
, and Yang
, W.-J.
, 1993
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,” ASME J. Heat Transfer
, 115
, No. 3
, pp. 560
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.13.
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, B. V.
, Wagner
, J. H.
, Steuber
, G. D.
, and Yeh
, F. C.
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,” ASME J. Turbomach.
, 116
, pp. 738
–744
.14.
Zhang
, Y. M.
, Han
, J. C.
, Parsons
, J. A.
, and Lee
, C. P.
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, 117
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16.
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, C. R.
, and Hwang
, G. J.
, 1996
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, 118
, No. 1
, pp. 23
–30
.17.
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18.
Wang
, T.-S.
, and Chyu
, M. K.
, 1994
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.19.
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20.
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, H.
, and Launder
, B. E.
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, 113
, No. 3
, pp. 331
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.21.
Iacovides
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, Launder
, B. E.
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, H.-Y.
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,” ASME J. Turbomach.
, 113
, No. 3
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.23.
Tekriwal
, P.
, 1991
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,” ASME J. Heat Transfer
, 116
, No. 2
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–380
.24.
Dutta
, S.
, Andrews
, M. J.
, and Han
, J. C.
, 1994
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,” AIAA J. of Thermophysics and Heat Transfer
,9
, No. 2
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.25.
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26.
Stephens, M. A., Chyu, M. K., Shih, T. I-P., and Civinskas, K. C., 1996, “Calculations and Measurements of Heat Transfer in a Square Duct with Inclined Ribs,” AIAA Paper 96-3163.
27.
Hwang, J.-J., Wang, W.-J., and Lai, D.-Y., 1997, “Numerical Simulation of Turbulent Heat Transfer and Flow in a Rotating Multiple-Pass Square Channel,” ASME 97-GT-367.
28.
Stephens
, M. A.
, and Shih
, T. I-P.
, 1999
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,” AIAA Journal of Propulsion and Power
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30.
Prakash
, C.
, and Zerkle
, R.
, 1992
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,” ASME J. Turbomach.
, 114
, No. 4
, pp. 835
–846
.31.
Prakash
, C.
, and Zerkle
, R.
, 1995
, “Prediction of Turbulent Flow and Heat Transfer in a Ribbed Rectangular Duct with and without Rotation
,” ASME J. Turbomach.
, 117
, pp. 255
–264
.32.
Abuaf
, N.
, and Kercher
, D. M.
, 1994
, “Heat Transfer and Turbulence in a Turbulated Blade Cooling Circuit
,” ASME J. Turbomach.
, 116
, pp. 169
–177
.33.
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34.
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35.
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36.
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37.
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38.
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39.
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40.
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41.
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42.
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43.
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