Detailed Nusselt number (Nu) distributions over the leading (LE) and trailing (TE) endwalls and the pressure drop coefficients (f) of a rotating transverse-ribbed two-pass parallelogram channel were measured. The impacts of Reynolds (Re), rotation (Ro), and buoyancy (Bu) numbers upon local and regionally averaged Nu over the endwall of two ribbed legs and the turn are explored for Re = 5000–20,000, Ro = 0–0.3, and Bu = 0.0015–0.122. The present work aims to study the combined buoyancy and Coriolis effects on thermal performances as the first attempt. A set of selected experimental data illustrates the isolated and interdependent Ro and Bu influences upon Nu with the impacts of Re and Ro on f disclosed. Moreover, thermal performance factors (TPF) for the tested channel are evaluated and compared with those collected from the channels with different cross-sectional shapes and endwall configurations to enlighten the relative heat transfer efficiency under rotating condition. Empirical Nu and f correlations are acquired to govern the entire Nu and f data generated. These correlations allow one to evaluate both isolated and combined Re, Ro and/or Bu impacts upon the thermal performances of the present rotating channel for internal cooling of gas turbine blades.

References

1.
Han
,
J. C.
,
Park
,
J. S.
, and
Lei
,
C. K.
,
1984
, “Heat Transfer and Pressure Drop in Blade Cooling Channels With Turbulence Promoters,” National Aeronautics and Space Administration, Washington, DC, Report No.
NASA-CR-3837
.https://ntrs.nasa.gov/search.jsp?R=19850004007&hterms=Heat+Transfer+Pressure+Drop+Blade+Cooling+Channels+Turbulence+Promoters&qs=N%3D0%26Ntk%3DAll%26Ntt%3DHeat%2520Transfer%2520and%2520Pressure%2520Drop%2520in%2520Blade%2520Cooling%2520Channels%2520With%2520Turbulence%2520Promoters%26Ntx%3Dmode%2520matchallpartial
2.
Taslim
,
M. E.
,
Li
,
T.
, and
Kercher
,
D. M.
,
1996
, “
Darryl E. Metzger Memorial Session Paper: Experimental Heat Transfer and Friction in Channels Roughened With Angled, V-Shaped and Discrete Ribs on Two opposite Walls
,”
ASME J. Heat Transfer
,
118
(
1
), pp.
20
28
.
3.
Ekkad
,
S. V.
, and
Han
,
J. C.
,
1997
, “
Detailed Heat Transfer Distributions in Two-Pass Square Channels With Rib Turbulators
,”
Int. J. Heat Mass Transfer
,
40
(11), pp.
2525
2537
.
4.
Ekkad
,
S. V.
,
Pamula
,
G.
, and
Shantiniketanam
,
M.
,
2000
, “
Detailed Heat Transfer Measurements Inside Straight and Tapered Two-Pass Channels With Rib Turbulators
,”
Exp. Therm. Fluid Sci.
,
22
(3–4), pp.
155
163
.
5.
Wagner
,
J. H.
,
Johnson
,
B. V.
, and
Graziani
,
R. A.
,
1992
, “
Heat Transfer in Rotating Serpentine Passages With Trips Normal to the Flow
,”
ASME J. Turbomach.
,
114
(4), pp.
847
858
.
6.
Johnson
,
B. V.
,
Wagner
,
J. H.
,
Steuber
,
G. D.
, and
Yeh
,
F. C.
,
1994
, “
Heat Transfer in Rotating Serpentine Passages With Trip Skewed to the Flow
,”
ASME J. Turbomach.
,
116
(
1
), pp.
113
123
.
7.
Al-Hadhrami
,
L.
, and
Han
,
J. C.
,
2002
, “
Effect of Rotation on Heat Transfer in Two-Pass Square Channels With Five Different Orientations of 45° Angled Rib Turbulators
,”
Int. J. Heat Mass Transfer
,
46
(4), pp.
653
669
.
8.
Chang
,
S. W.
, and
Morris
,
W. D.
,
2003
, “
Heat Transfer in a Radially Rotating Square Duct Fitted With In-Line Transverse Ribs
,”
Int. J. Therm. Sci.
,
42
(3), pp.
267
282
.
9.
Chang
,
S. W.
,
Liou
,
T. M.
,
Hung
,
J. H.
, and
Yeh
,
W. H.
,
2007
, “
Heat Transfer in a Rotating Square-Sectioned Duct With Two opposite Walls Roughened by 45 Degree Staggered Ribs at High Rotation Numbers
,”
ASME J. Heat Transfer
,
129
(
2
), pp.
188
199
.
10.
Chang
,
S. W.
,
Liou
,
T. M.
, and
Po
,
Y.
,
2010
, “
Coriolis and Rotating Buoyancy Effect on Detailed Heat Transfer Distributions in a Two-Pass Square Channel Roughened by 45° Ribs at High Rotation Numbers
,”
Int. J. Heat Mass Transfer
,
53
(7–8), pp.
1349
1363
.
11.
Mohammad
,
A. Q.
,
Chen
,
H. C.
, and
Han
,
J. C.
,
2003
, “
A Numerical Study of Flow and Heat Transfer in Rotating Rectangular Channels (AR=4) With 45 Deg Rib Turbulators by Reynolds Stress Turbulence Model
,”
ASME J. Heat Transfer
,
125
(
1
), pp.
19
26
.
12.
Liou
,
T. M.
,
Chang
,
S. W.
,
Hung
,
J. H.
, and
Chiou
,
S. F.
,
2007
, “
High Rotation Number Heat Transfer of a 45-Deg Rib-Roughened Rectangular Duct With Two Channel Orientations
,”
Int. J. Heat Mass Transfer
,
50
(19–20), pp.
4063
4078
.
13.
Liou
,
T. M.
,
Chang
,
S. W.
,
Chen
,
J. S.
,
Yang
,
T. L.
, and
Lan
,
Y. A.
,
2009
, “
Influence of Channel Aspect Ratio on Heat Transfer in Rotating Rectangular Ducts With Skewed Ribs at High Rotation Numbers
,”
Int. J. Heat Mass Transfer
,
52
(23–24), pp.
5309
5322
.
14.
Morris
,
W. D.
, and
Rahmat-Abadi
,
K. F.
,
1996
, “
Convective Heat Transfer in Rotating Ribbed Tubes
,”
Int. J. Heat Mass Transfer
,
39
(11), pp.
2253
2266
.
15.
Chang
,
S. W.
,
Liou
,
T. M.
,
Chiou
,
S. F.
, and
Chang
,
S. F.
,
2008
, “
Heat Transfer in High-Speed Rotating Trapezoidal Duct With Rib-Roughened Surfaces and Air Bleeds From the Wall on Apical Side
,”
ASME J. Heat Transfer
,
130
(
6
), p.
061702
.
16.
Chang
,
S. W.
,
Liou
,
T. M.
, and
Lee
,
T. H.
,
2012
, “
Thermal Performance of Developing Flow in a Radially Rotating Parallelogram Channel With 45 Degrees Ribs
,”
Int. J. Therm. Sci.
,
52
, pp.
186
204
.
17.
Chang
,
S. W.
,
Liou
,
T. M.
, and
Lee
,
T. H.
,
2012
, “
Thermal Performance Comparison Between Radially Rotating Ribbed Parallelogram Channels With and Without Dimples
,”
Int. J. Heat Mass Transfer
,
55
(13–14), pp.
3541
3559
.
18.
Dutta
,
S.
,
Han
,
J. C.
, and
Lee
,
C. P.
,
1996
, “
Local Heat Transfer in a Rotating Two-Pass Ribbed Triangular Duct With Two Model Orientations
,”
Int. J. Heat Mass Transfer
,
39
(4), pp.
707
715
.
19.
Iacovides
,
H.
,
Jackson
,
D. C.
,
Kelemenis
,
G.
,
Launder
,
B. E.
, and
Nikas
,
K.
,
1998
, “
LDA Study of the Flow Development Through Orthogonally Rotating U-Bend of Strong Curvature and Rib Roughened Walls
,”
ASME J. Turbomach.
,
120
(
2
), pp.
386
391
.
20.
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 Blades
,”
JSME Int. J., Ser. B, Therm. Fluids
,
41
(2), pp.
302
315
.
21.
Murata
,
A.
, and
Mochizuki
,
S.
,
2004
, “
Aiding and Opposing Contributions of Centrifugal Buoyancy on Turbulent Heat Transfer in a Two-Pass Transverse-or Angled-Rib-Roughened Channel With Sharp 180° Turns
,”
Int. J. Heat Mass Transfer
,
47
(17–18), pp.
3721
3743
.
22.
Elfert
,
M.
,
Schroll
,
M.
, and
Förster
,
W.
,
2012
, “
PIV Measurement of Secondary Flow in a Rotating Two-Pass Cooling System With an Improved Sequencer Technique
,”
ASME J. Turbomach.
,
134
(
3
), p.
031001
.
23.
Gee
,
D. L.
, and
Webb
,
R. L.
,
1980
, “
Forced Convection Heat Transfer in Helically Rib-Roughened Tubes
,”
Int. J. Heat Mass Transfer
,
23
(8), pp.
1127
1135
.
24.
Kim
,
J. H.
,
Simon
,
T. W.
, and
Viskanta
,
R.
,
1993
, “
Journal of Heat Transfer Policy on Reporting Uncertainties in Experimental Measurements and Results
,”
ASME J. Heat Transfer
,
115
(
1
), pp.
5
6
.
25.
Johnson
,
B. V.
,
Wagner
,
J. H.
, and
Steuber
,
G. D.
,
1993
, “Effects of Rotation on Coolant Passage Heat Transfer. Volume II-Coolant Passages With Trips Normal and Skewed to the Flow,” National Aeronautics and Space Administration, Washington, DC, Report No.
NASA-CR-4396-VOL-2
https://ntrs.nasa.gov/search.jsp?R=19940011518.
26.
Liou
,
T. M.
,
Chang
,
S. W.
,
Huang
,
C. Y.
,
Chan
,
S. P.
, and
Lan
,
Y. A.
,
2016
, “
Particle Image Velocimetry and Infrared Thermography Measurements in a Two-Pass 90-Deg Ribbed Parallelogram Channel
,”
Int. J. Heat Mass Transfer
,
93
, pp.
1175
1189
.
27.
Liou
,
T. M.
,
Chang
,
S. W.
, and
Yang
,
C. C.
,
2014
, “
Heat Transfer and Pressure Drop Measurements of Rotating Twin-Pass Parallelogram Ribbed Channel
,”
Int. J. Therm. Sci.
,
79
, pp.
206
219
.
28.
Liou
,
T. M.
,
Chang
,
S. W.
,
Yang
,
C. C.
, and
Lan
,
Y. A.
,
2014
, “
Thermal Performance of a Radially Rotating Twin-Pass Smooth-Walled Parallelogram Channel
,”
ASME J. Turbomach.
,
136
(
12
), p.
121007
.
29.
Oh
,
I. T.
,
Kim
,
K. M.
,
Lee
,
D. H.
,
Park
,
J. S.
, and
Cho
,
H. H.
,
2012
, “
Local Heat/Mass Transfer and Friction Loss Measurement in a Rotating Matrix Cooling Channel
,”
ASME J. Heat Transfer
,
134
(
1
), p.
011901
.
30.
Fu
,
W. L.
,
2005
, “Aspect Ratio Effect on Heat Transfer in Rotating Two-Pass Rectangular Channels With Smooth Walls and Ribbed Walls,”
Ph.D. dissertation
, Texas A&M University, College Station, TX.http://oaktrust.library.tamu.edu/handle/1969.1/2358
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