Abstract

Laser-doppler velocimetry and transient thermochromic liquid crystal measurements are presented to understand local fluid flow and surface heat transfer distributions in a rotating ribbed duct with a 180 deg sharp turn. The in-line 90-deg ribs were arranged on the leading and trailing walls with rib height-to-hydraulic diameter ratio and pitch-to-height ratio of 0.136 and 10, respectively. The Reynolds number, based on duct hydraulic diameter and bulk mean velocity, was fixed at 1.0×104 whereas the rotational number varied from 0 to 0.2. Results are compared with those of the rotating smooth duct flow in terms of maximum streamwise mean velocities Umax/Ub and turbulence intensities umax/Ub, skewness of mean velocity profiles, secondary flow pattern, turn-induced separation bubble, and turbulence anisotropy. Nusselt number ratio mappings are also provided on the leading and trailing walls. The relationships between the fluid flow and local heat transfer enhancement are also documented. It is found that the rotating ribbed duct flow provides higher Umax/Ub,umax/Ub, and stronger total averaged secondary flow and, hence heat transfer is enhanced. Comparisons with heat transfer data published by other research groups are also made. Furthermore, simple linear correlations between regional averaged Nusselt number ratio and rotation number are developed.

1.
Elfer, M., 1993, “The Effect of Rotation and Buoyancy on Flow Development in a Rotating Circular Coolant Channel,” 2nd International Symposium on Engineering Turbulence Modeling and Measurements, May 31–June 2, Florence, Italy.
2.
Bons, J. P., and Kerrebrock, J. L., 1998, “Complementary Velocity and Heat Transfer Measurements in a Rotating Cooling Passage with Smooth Walls,” ASME Paper No. 98-GT-464.
3.
Liou
,
T. M.
, and
Chen
,
C. C.
,
1999
, “
LDV Study of Developing Flows through a Smooth Duct with 180-deg Straight-Corner Turn,” Paper No. 97-GT-283
,
ASME J. Turbomach.
,
121
, pp.
167
174
.
4.
Servouze, Y., 1998, “3D Laser Anemometry in a Rotating Cooling Channel,” ASME Paper No. 98-GT-123.
5.
Chen, C. C., and Liou, T. M., 2000, “Rotating Effect on Fluid Flow in a Smooth Duct with a 180-Deg Sharp Turn,” 45th ASME Int. Gas Turbine & Aeroengine Technical Congress, Munich, Germany. ASME Paper No. 2000-GT-228.
6.
Cheah
,
S. C.
,
Iacovides
,
H.
,
Jackson
,
D. C.
,
Ji
,
H.
, and
Launder
,
B. E.
,
1996
, “
LDA Investigation of the Flow Development through Rotating U-Ducts
,”
ASME J. Turbomach.
,
118
, pp.
590
596
.
7.
Hsieh, S. S., Chiang, M. H., and Chen, P. J., 1997, “Velocity Measurements and Local Heat Transfer in a Rotating Ribbed Two-Pass Square Channel with Uneven Wall Heat Flux,” ASME Paper No. 97-GT-160.
8.
Tse, G. N., and Steuber, G. D., 1997, “Flow in a Rotating Square Serpentine Coolant Passage With Skewed Trips,” ASME Paper No. 97-GT-529.
9.
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.
,
177
, pp.
255
264
.
10.
Iacovides
,
H.
, and
Raisee
,
M.
,
1999
, “
Recent Progress in the Computation of Flow and Heat Transfer in Internal Cooling Passages of Turbine Blades
,”
Int. J. Heat Mass Transf.
,
20
, pp.
320
328
.
11.
Jang, Y. J. Chen, H. C., and Han, J. C., 2000, “Flow and Heat Transfer in a Rotating Square Channel with 45° Angled Ribs by Reynolds Stress Turbulence Mosel,” 45th ASME Int. Gas Turbine & Aeroengine Technical Congress, Munich, Germany.
12.
Wagner
,
J. H.
,
Johnson
,
B. V.
,
Graziani
,
R. A.
, and
Yeh
,
F. C.
,
1992
, “
Heat Transfer in Rotating Serpentine Passages with Trips Normal to the Flow
,”
ASME J. Turbomach.
,
114
, pp.
847
857
.
13.
Johnson
,
B. V.
,
Wagner
,
J. H.
,
Steuber
,
G. D.
, and
Yeh
,
F. C.
,
1994
, “
Heat Transfer in Rotating Serpentine Passages with Trips Skewed to the Flow
,”
ASME J. Turbomach.
,
116
, pp.
113
123
.
14.
Parsons
,
J. A.
,
Han
,
J. C.
, and
Zhang
,
Y. M.
,
1994
, “
Wall Heating Effect on Local Heat Transfer in a Rotating Two-Pass Square Channel with 90° Rib Turbulators
,”
Int. J. Heat Mass Transf.
,
37
, No.
9
, pp.
1411
1420
.
15.
Zhang
,
Y. M.
,
Han
,
J. C.
,
Parsons
,
J. A.
,
1993
, “
Surface Heating Effect on Local Heat Transfer in a Rotating Two-Pass Square Channel with 60° Angled Rib Turbulators
,”
ASME J. Turbomach.
,
117
, pp.
272
280
.
16.
Taslim
,
M. E.
,
Rahman
,
A.
, and
Spring
,
S. D.
,
1991
, “
An Experimental Investigation of Heat Transfer Coefficients in a Spanwise Rotating Channel with Two Opposite Rib-Roughened Walls
,”
ASME J. Turbomach.
,
113
, pp.
75
82
.
17.
El-Husayni
,
H. A.
,
Taslim
,
M. E.
, and
Kercher
,
D. M.
,
1994
, “
Experimental Heat Transfer Investigation of Stationary and Orthogonally Rotating Asymmetric and Symmetric Heated Smooth and Turbulated Channels
,”
ASME J. Turbomach.
,
166
, pp.
124
132
.
18.
Liou
,
T. M.
,
Tzeng
,
Y. Y.
, and
Chen
,
C. C.
,
1999
, “
Fluid Flow in a 180 deg Sharp Turning Duct With Different Divider Thickness
,”
ASME J. Turbomach.
,
121
, pp.
569
576
.
19.
Liou
,
T. M.
,
Chen
,
C. C.
, and
Tsai
,
T. W.
,
2000
, “
Heat Transfer and Fluid Flow in a Square Duct with 12 Different Shaped Vortex Generators
,”
ASME J. Heat Transfer
,
122
, pp.
327
335
.
20.
Liou
,
T. M.
,
Chen
,
C. C.
, and
Chen
,
M. Y.
,
2001
, “
TLCT and LDV Measurements of Heat Transfer and Fluid Flow in a Rotating Sharp Turning Duct
,”
Int. J. Heat Mass Transf.
,
44
, No
9
, pp.
1777
1787
.
21.
Durst, F., Melling, A., and Whitelaw, J. H., 1976, Principles and Practice of Laser-Doppler Anemometry, Academic Press, New York, NY.
22.
Chang
,
S. W.
, and
Morris
,
W. D.
,
1998
, “
A Comparative Study of Heat Transfer Between Rotating Circular Smooth-Walled and Square Rib-Roughened Ducts With Cooling Application for Gas Turbine Rotor Blade
,”
JSME Int. J., Ser. B
,
41
, pp.
302
315
.
23.
Chang, S. W., 1995, “An Experimental Study of Heat Transfer in the Cooling Passages of Gas Turbine Rotor Blades,” doctoral dissertation, Department of Mechanical Engineering, University of Wales, Swansea, UK.
24.
Jang, Y. J., Chen, H. C., and Han, J. C., 2000, “Numerical Prediction of Flow and Heat Transfer in a Two-Pass Square Channel with 90° Ribs,” Proc., 8th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Honolulu, HI, 1, pp. 580–587.
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