The present two-part work deals with a detailed characterization of the flow field and heat transfer distribution in a model of a rotating ribbed channel performed in a novel setup which allows test conditions at high rotation numbers (Ro). The tested model is mounted on a rotating frame with all the required instrumentation, resulting in a high spatial resolution and accuracy. The channel has a cross section with an aspect ratio of 0.9 and a ribbed wall with eight ribs perpendicular to the main flow direction. The blockage of the ribs is 10% of the channel cross section, whereas the rib pitch-to-height ratio is 10. In this second part of the study, the heat transfer distribution over the wall region between the sixth and seventh ribs is obtained by means of liquid crystal thermography (LCT). Tests were first carried out at a Reynolds number of 15,000 and a maximum Ro of 1.00 to evaluate the evolution of the heat transfer with increasing rotation. On the trailing side (TS), the overall Nusselt number increases with rotation until a limit value of 50% higher than in the static case, which is achieved after a value of the rotation number of about 0.3. On the leading side (LS), the overall Nusselt number decreases with increasing rotation speed to reach a minimum which is approximately 50% of the one found in static conditions. The velocity measurements at Re= 15,000 and Ro= 0.77 provided in Part I of this paper are finally merged to provide a consistent explanation of the heat transfer distribution in this model. Moreover, heat transfer measurements were performed at Reynolds numbers of 30,000 and 55,000, showing approximately the same trend.

References

References
1.
Han
,
J. C.
,
Dutta
,
S.
, and
Ekkad
,
S.
,
2012
,
Gas Turbine Heat Transfer and Cooling Technology
,
2nd ed.
,
Taylor & Francis
,
New York
.
2.
Ligrani
,
P.
,
2013
, “
Heat Transfer Augmentation Technologies for Internal Cooling of Turbine Components of Gas Turbine Engines
,”
Int. J. Rotating Mach.
,
2013
, p.
275653
.
3.
Coletti
,
F.
,
Lo Jacono
,
D.
,
Cresci
,
I.
, and
Arts
,
T.
,
2014
, “
Turbulent Flow in Rib-Roughened Channel Under the Effect of Coriolis and Rotational Buoyancy Forces
,”
Phys. Fluids
,
26
(
4
), p.
045111
.
4.
Hajek
,
T. J.
,
Wagner
,
J. H.
,
Johnson
,
B. V.
,
Higgings
,
A. W.
, and
Steuber
,
G. D.
,
1991
, “
Effects of Rotation on Coolant Passage Heat Transfer—Volume I: Coolant Passages With Smooth Walls
,” National Aeronautical and Space Administration, Lewis Research Center, Cleveland, OH, Report No. NASA CR 4396.
5.
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 Aeronautical and Space Administration, Lewis Research Center, Cleveland, OH,
Report No. NASA CR 4396
.
6.
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.
,
121
(
4
), pp.
651
662
.
7.
Mayo
,
I.
,
Arts
,
T.
,
El-Habib
,
A.
, and
Parres
,
B.
,
2014
, “
Two Dimensional Heat Transfer Distribution of a Rotating Ribbed Channel at Different Reynolds Numbers
,”
ASME J. Turbomach.
,
137
(
3
), p.
031002
.
8.
Coletti
,
F.
,
Maurer
,
T.
,
Arts
,
T.
, and
Di Sante
,
A.
,
2012
, “
Flow Field Investigation in Rotating Rib-Roughened Channel by Means of Particle Image Velocimetry
,”
Exp. Fluids
,
52
(
4
), pp.
1043
1061
.
9.
Mayo
,
I.
,
Gori
,
G. L.
,
Lahalle
,
A.
, and
Arts
,
T.
,
2015
, “
Aero-Thermal Characterization of a Rotating Ribbed Channel at Engine Representative Rotation Numbers—Part I: High Resolution PIV Measurements
,”
ASME J. Turbomach.
, (accepted).
10.
Di Sante
,
A.
,
Theunissen
,
R.
, and
Van den Braembussche
,
R. A.
,
2008
, “
A New Facility for Time-Resolved PIV Measurements in Rotating Channels
,”
Exp. Fluids
,
44
(
2
), pp.
179
188
.
11.
Mayo
,
I.
,
Arts
,
T.
,
Clinckemaillie
,
J.
, and
Lahalle
,
A.
,
2013
, “
Spatially Resolved Heat Transfer Coefficient in a Rib-Roughened Channel Under Coriolis Effects
,”
ASME
Paper No. GT-2013-94506.
12.
Cukurel
,
B.
,
Selcan
,
C.
, and
Arts
,
T.
,
2012
, “
Color Theory Perception of Steady Wide Band Liquid Crystal Thermometry
,”
Exp. Therm. Fluid Sci.
,
39
, pp.
112
122
.
13.
Coletti
,
F.
,
2010
, “
Coupled Flow Field and Heat Transfer in an Advanced Internal Cooling
,”
Ph.D. thesis
, von Karman Institute for Fluid Dynamics, Rhode-Saint-Genèse, Belgium and Universitat Stuttgart, Stuttgart, Germany.
14.
Kodzwa
,
P. M.
, and
Eaton
,
J. K.
,
2005
, “
Measurements of Film Cooling Performance in a Transonic Single Passage Model
,” Stanford University, Stanford, CA, Report No. TF-93.
15.
ASME
,
2005
, “
Test Uncertainty
,” ASME PTC 19.1, The American Society of Mechanical Engineers, New York.
16.
NASA
,
2010
, “
Measurement Uncertainty Analysis—Principles and Methods
,” National Aeronautics and Space Administration, Washington, DC, Report No. NASA-HDBK-8739.19-2.
17.
Rao
,
Y.
, and
Xu
,
Y.
,
2012
, “
Liquid Crystal Thermography Measurement Uncertainty Analysis and Its Application to Turbulent Heat Transfer Measurements
,”
Adv. Condens. Matter Phys.
,
2012
, p.
898104
.
18.
Kodzwa
,
P. M.
, and
Eaton
,
J. K.
,
2013
, “
Heat Transfer Coefficient Measurements on the Film-Cooled Pressure Surface of a Transonic Airfoil
,”
ASME J. Turbomach.
,
135
(
6
), p.
061011
.
19.
Ekkad
,
S.
, and
Han
,
J. C.
,
1997
, “
Detailed Heat Transfer Distributions in a Two-Pass Square Channels With Rib Turbulators
,”
Int. J. Heat Mass Transfer
,
40
(
11
), pp.
2525
2537
.
20.
Abdel-Wahab
,
S.
, and
Tafti
,
D. K.
,
2004
, “
Large Eddy Simulation of Flow and Heat Transfer in a 90 deg Ribbed Duct With Rotation—Effect of Coriolis Forces
,”
ASME
Paper No. GT2004-53796.
21.
Sewall
,
E. A.
,
2005
, “
Large Eddy Simulations of Flow and Heat Transfer in the Developing and 180 deg Bend Regions of Ribbed Gas Turbine Blade Internal Cooling Ducts With Rotation—Effect of Coriolis and Centrifugal Buoyancy Forces
,”
Ph.D. thesis
, Virginia Polytechnic Institute and State University, Blacksburg, VA.
22.
Abdel-Wahab
,
S.
, and
Tafti
,
D. K.
,
2004
, “
Large Eddy Simulation of Flow and Heat Transfer in a 90 deg Ribbed Duct With Rotation—Effect of Coriolis and Centrifugal Buoyancy Forces
,”
ASME
Paper No. GT2004-53799.
23.
Kim
,
K. M.
,
Kim
,
Y. Y.
,
Lee
,
D. H.
,
Rhee
,
D. H.
, and
Cho
,
H. H.
,
2007
, “
Influence of Duct Aspect Ratio on Heat/Mass Transfer in Coolant Passages With Rotation
,”
Int. J. Heat Fluid Flow
,
28
(
3
), pp.
357
373
.
You do not currently have access to this content.