Heat transfer coefficients are experimentally measured in a rotating cooling channel used to model an internal cooling passage near the trailing edge of a gas turbine blade. The regionally averaged heat transfer coefficients are measured in a wedge-shaped cooling channel (, ). The Reynolds number of the coolant varies from 10,000 to 40,000. By varying the rotational speed of the channel, the rotation number and buoyancy parameter range from 0 to 1.0 and 0 to 3.5, respectively. Significant variation of the heat transfer coefficients in both the spanwise and streamwise directions is apparent. Spanwise variation is the result of the wedge-shaped design, and streamwise variation is the result of the sharp entrance into the channel and the turn at the outlet of the channel. With the channel rotating at 135° with respect to the direction of rotation, the heat transfer coefficients are enhanced on every surface of the channel. Both the nondimensional rotation number and buoyancy parameter have proven to be excellent parameters to quantify the effect of rotation over the extended ranges achieved in this study.
Issue Section:
Forced Convection
1.
Han
, J. C.
, Dutta
, S.
, and Ekkad
, S. V.
, 2000, Gas Turbine Heat Transfer and Cooling Technology
, Taylor and Francis
, New York
.2.
Kays
, W. M.
, and Crawford
, M. E.
, 1993, Convective Heat and Mass Transfer
, 3rd ed., McGraw-Hill
, New York
, pp. 311
–349
.3.
Wagner
, J. H.
, Johnson
, B. V.
, and Hajek
, T. J.
, 1991, “Heat Transfer in Rotating Passage With Smooth Walls and Radial Outward Flow
,” ASME J. Turbomach.
0889-504X, 113
, pp. 42
–51
.4.
Wagner
, J. H.
, Johnson
, B. V.
, and Kopper
, F. C.
, 1991, “Heat Transfer in Rotating Passage With Smooth Walls
,” ASME J. Turbomach.
0889-504X, 113
, pp. 321
–330
.5.
Johnson
, B. V.
, Wagner
, J. H.
, Steuber
, G. D.
, and Yeh
, F. C.
, 1994, “Heat Transfer in Rotating Serpentine Passage With Selected Model Orientations for Smooth or Skewed Trip Walls
,” ASME J. Turbomach.
0889-504X, 116
, pp. 738
–744
.6.
Dutta
, S.
, and Han
, J. C.
, 1996, “Local Heat Transfer in Rotating Smooth and Ribbed Two-Pass Square Channels With Three Channel Orientations
,” ASME J. Heat Transfer
0022-1481, 118
, pp. 578
–584
.7.
Park
, C. W.
, and Lau
, S. C.
, 1998, “Effect of Channel Orientation of Local Heat (Mass) Distributions in Rotating Two-Pass Square Channel With Smooth Walls
,” ASME J. Heat Transfer
0022-1481, 120
, pp. 624
–632
.8.
Bons
, J. P.
, and Kerrebrock
, J. L.
, 1999, “Complementary Velocity and Heat Transfer Measurements in a Rotating Cooling Passage With Smooth Walls
,” ASME J. Turbomach.
0889-504X, 121
, pp. 651
–662
.9.
Azad
, G. S.
, Uddin
, M. J.
, Han
, J. C.
, Moon
, H. K.
, and Glezer
, B.
, 2002, “Heat Transfer in a Two-Pass Rectangular Rotating Channel With 45-Deg Angled Rib Turbulators
,” ASME J. Turbomach.
0889-504X, 124
, pp. 251
–259
.10.
Griffith
, T. S.
, Al-Hadhrami
, L.
, and Han
, J. C.
, 2002, “Heat Transfer in Rotating Rectangular Cooling Channels (AR=4) With Angled Ribs
,” ASME J. Heat Transfer
0022-1481, 124
, pp. 617
–625
.11.
Wright
, L. M.
, Lee
, E.
, and Han
, J. C.
, 2005, “Influence of Entrance Geometry on Heat Transfer in Rotating Rectangular Cooling Channels (AR=4:1) With Angled Ribs
,” ASME J. Heat Transfer
0022-1481, 127
(4
), pp. 378
–387
.12.
Acharya
, S.
, Agarwal
, P.
, and Nikitopoulos
, D. E.
, 2004, “Heat/Mass Transfer in a 4:1 AR Smooth and Ribbed Coolant Passage With Rotation in 90-Degreee and 45-Degree Orientations
,” ASME Paper No. GT2004-53928.13.
Zhou
, F.
, Lagrone
, J.
, and Acharya
, S.
, 2004, “Internal Cooling in 4:1 AR Passages at High Rotation Numbers
,” ASME Paper No. GT2004-53501.14.
Willett
, F. T.
, and Bergles
, A. E.
, 2001, “Heat Transfer in Rotating Narrow Rectangular Ducts With Heated Sides Orientated at 60° to the R-Z Plane
,” ASME J. Turbomach.
0889-504X, 123
, pp. 288
–295
.15.
Cho
, H. H.
, Kim
, Y. Y.
, Kim
, K. M.
, and Rhee
, D. H.
, 2003, “Effects of Rib Arrangements and Rotation Speed on Heat Transfer in a Two-Pass Duct
,” ASME Paper No. 2003-GT-38609.16.
Agarwal
, P.
, Acharya
, S.
, and Nikitopoulos
, D. E.
, 2003, “Heat/Mass Transfer in 1:4 Rectangular Passages With Rotation
,” ASME Paper No. 2003-GT-38615.17.
Fu
, W. L.
, Wright
, L. M.
, and Han
, J. C.
, 2005, “Heat Transfer in Two-Pass Rotating Rectangular Channels (AR=1:2 and AR=1:4) With Smooth Walls
,” ASME J. Heat Transfer
0022-1481, 127
(3
), pp. 265
–277
.18.
Fu
, W. L.
, Wright
, L. M.
, and Han
, J. C.
, 2005, “Buoyancy Effects on Heat Transfer in Five Different Aspect-Ratio Rectangular Channels With Smooth Walls and 45-Degree Ribbed Walls
,” ASME Paper No. GT 2005-68493.19.
Lowdermilk
, W. H.
, Weiland
, W. F.
, and Livingood
, J. N. B.
, 1954, “Measurement of Heat Transfer and Friction Coefficients for Flow of Air in Noncircular Ducts at High Surface Temperatures
,” NACA RM E53J07.20.
Ahn
, S. W.
, and Son
, K. P.
, 2002, “Heat Transfer and Pressure Drop in the Roughened Equilateral Triangular Duct
,” Int. Commun. Heat Mass Transfer
0735-1933, 29
, pp. 479
–488
.21.
Obot
, N. T.
, 1985, “Heat Transfer in a Smooth Scalene Triangular Duct With Two Rounded Corners
,” Int. Commun. Heat Mass Transfer
0735-1933, 12
, pp. 251
–258
.22.
Zhang
, Y. M.
, Gu
, W. Z.
, and Han
, J. C.
, 1994, “Augmented Heat Transfer in Triangular Ducts With Full and Partial Ribbed Walls
,” J. Thermophys. Heat Transfer
0887-8722, 8
, pp. 574
–579
.23.
Eckert
, E. R. G.
, and Irvine
, T. F.
, 1960, “Pressure Drop and Heat Transfer in a Duct With Triangular Cross Section
,” ASME J. Heat Transfer
0022-1481, 82
, pp. 125
–138
.24.
Ainsworth
, R. W.
, and Jones
, T. V.
, 1979, “Measurements of Heat Transfer in Circular, Rectangular, and Triangular Ducts, Representing Typical Turbine Blade Cooling Passages Using Transient Techniques
,” ASME Paper No. 79-GT-40.25.
Rohsenow
, W. M.
, Hartnett
, J. P.
, and Cho
, Y. I.
, 1998, Handbook of Heat Transfer
, 3rd ed., McGraw Hill
, Boston, MA
.26.
Taslim
, M. E.
, Li
, T.
, and Spring
, S. D.
, 1995, “Experimental Study of the Effects of Bleed Holes on Heat Transfer and Pressure Drop in Trapezoidal Passages With Tapered Turbulators
,” ASME J. Turbomach.
0889-504X, 117
, pp. 281
–289
.27.
Hwang
, J. J.
, and Lu
, C. C.
, 2001, “Lateral-Flow Effect on Endwall Heat Transfer and Pressure Drop in a Pin Fin Trapezoidal Duct With Various Pin Shapes
,” ASME J. Turbomach.
0889-504X, 123
, pp. 133
–139
.28.
Wright
, L. M.
, Fu
, W. L.
, and Han
, J. C.
, 2004, “Thermal Performance of Angled, V-Shaped, and W-Shaped Rib Turbulators in Rotating Rectangular Cooling Channels (AR=4:1)
,” ASME Paper No. GT 2004-54073.29.
Willet
, F. T.
, and Bergles
, A. E.
, 2002, “Heat Transfer in Rotating Narrow Rectangular Pin-Fin Ducts
,” Exp. Therm. Fluid Sci.
0894-1777, 25
, pp. 573
–582
.30.
Wright
, L. M.
, Lee
, E.
, and Han
, J. C.
, 2004, “Effect of Rotation on Heat Transfer in Rectangular Channels With Pin-Fins
,” J. Thermophys. Heat Transfer
0887-8722, 18
, pp. 263
–272
.31.
Kline
, S. J.
, and McClintock
, F. A.
, 1953, “Describing Uncertainty in Single-Sample Experiments
,” Mech. Eng. (Am. Soc. Mech. Eng.)
0025-6501, 75
, pp. 3
–8
.Copyright © 2008
by American Society of Mechanical Engineers
You do not currently have access to this content.
