An investigation into determining the effect of rotation on heat transfer in a rib-roughened rectangular channel with aspect ratio of 4:1 is detailed in this paper. A broad range of flow parameters have been selected including Reynolds number (Re=5000–40000), rotation number (Ro=0.04–0.3) and coolant to wall density ratio at the inlet Δρ/ρi=0.122. The rib turbulators, attached to the leading and trailing surface, are oriented at an angle α=45deg to the direction of flow. The effect of channel orientations of β=90 deg and 135 deg with respect to the plane of rotation is also investigated. Results show that the narrow rectangular passage exhibits a much higher heat transfer enhancement for the ribbed surface than the square and 2:1 duct previously investigated. Also, duct orientation significantly affects the leading and side surfaces, yet does not have much affect on the trailing surfaces for both smooth and ribbed surfaces. Furthermore, spanwise heat transfer distributions exist across the leading and trailing surfaces and are accentuated by the use of angled ribs. The smooth and ribbed case trailing surfaces and smooth case side surfaces exhibited a strong dependence on rotation number.

Issue Section:
Forced Convection
Keywords:
rotational flow, flow measurement, channel flow, heat transfer, cooling, Enhancement, Heat transfer, Rotating, Roughness, Turbines
Topics:
Cooling, Ducts, Flow (Dynamics), Heat transfer, Rotation
1.
Han
,
J. C.
, and
Park
,
J. S.
,
1988
, “
Developing Heat Transfer in Rectangular Channel With Rib Turbulators
,”
Int. J. Heat Mass Transf.
,
31
(
1
), pp.
183
–
195
.
2.
Han
,
J. C.
,
Zhang
,
Y. M.
, and
Lee
,
C. P.
,
1991
, “
Augmented Heat Transfer in Square Channels With Parallel, Crossed, and V-Shaped Angled Ribs
,”
ASME J. Heat Transfer
,
113
, pp.
590
–
596
.
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.
,
113
, pp.
42
–
51
.
4.
Wagner
,
J. H.
,
Johnson
,
B. V.
, and
Kooper
,
F. C.
,
1991
, “
Heat Transfer in Rotating Serpentine Passage With Smooth Walls
,”
ASME J. Turbomach.
,
113
(
3
), pp.
321
–
330
.
5.
Parsons
,
J. A.
,
Han
,
J. C.
, and
Zhang
,
Y. M.
,
1995
, “
Effects of Model Orientation and Wall Heating Condition on Local Heat Transfer in a Rotating Two-Pass Square Channel With Rib Turbulators
,”
Int. J. Heat Mass Transf.
,
38
(
7
), pp.
1151
–
1159
.
6.
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.
,
116
, pp.
738
–
744
.
7.
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
,
118
, pp.
578
–
584
.
8.
Al-Qahtani, M., Jang, Y., Chen, H. C., and Han, J. C., 2001, “Prediction of Flow and Heat Transfer in Rotating Two-Pass Rectangular Channels with 45 deg Rib Turbulators,” ASME Paper No. 2001-GT-0187.
9.
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
.
10.
Taslim
,
M. E.
,
Bondi
,
L. A.
, and
Kercher
,
D. M.
,
1991
, “
An Experimental Investigation of Heat Transfer in an Orthogonally Rotating Channel Roughened With 45 deg Criss-Cross Ribs on Two Opposite Walls
,”
ASME J. Turbomach.
,
113
, pp.
346
–
353
.
11.
Willett, F. T., and Bergles, A. E., 2000, “Heat Transfer in Rotating Narrow Rectangular Ducts with Heated Sides Oriented at 60 deg to the R-Z Plane,” ASME Paper No. 2000-GT-224.
12.
Han, J. C., Dutta, S., and Ekkad, S. V., 2000, Gas Turbine Heat Transfer and Cooling Technology, Taylor and Francis, New York.
13.
Han
,
J. C.
, and
Dutta
,
S.
,
2001
, “
Recent Developments in Turbine Blade Internal Cooling,” in Heat Transfer in Gas Turbine Systems, R. J. Goldstein, ed.
,
Ann. N.Y. Acad. Sci.
,
934
, pp.
162
–
178
.
14.
Dutta
,
S.
, and
Han
,
J. C.
,
1998
, “
Rotational Effects on the Turbine Blade Coolant Passage Heat Transfer
,”
Annu. Rev. Heat Transfer
,
9
, pp.
268
–
314
.
15.
Kline
,
S. J.
, and
McClintock
,
F. A.
,
1953
, “
Describing Uncertainties in Single-Sample Experiments
,”
Mech. Eng. (Am. Soc. Mech. Eng.)
,
75
, pp.
3
–
8
.
16.
Azad, G. S., Uddin, J. M., Han, J. C., Moon, H. K., and Glezer, B., 2001, “Heat Transfer in a Two-Pass Rectangular Rotating Channel with 45 deg Angled Rib Turbulators,” ASME Paper No. 2001-GT-0186.
Copyright © 2002
 by ASME
You do not currently have access to this content.