The effect of channel rotation on jet impingement cooling by arrays of circular jets in two channels was studied. Jet flow direction was in the direction of rotation in one channel and opposite to the rotation direction in the other channel. The jets impinged normally on two smooth target walls. Heat transfer results are presented for these two target walls, for the jet walls containing the jet producing orifices, and for side walls, connecting the target and jet walls. The flow exited the channels in a single direction, radially outward, creating a crossflow on jets at larger radii. The mean test model radius-to-jet diameter ratio was 397. The jet rotation number was varied from 0.0 to 0.0028 and the isolated effects of jet Reynolds number (5000 and 10,000), and wall-to-coolant temperature difference ratio (0.0855 and 0.129) were measured. The results for nonrotating conditions show that the Nusselt numbers for the target and jet walls in both channels are about the same and are greater than those for the side walls of both channels. However, as rotation number increases, the heat transfer coefficients for all walls in both channels decrease up to 20 percent below those results that correspond to nonrotating conditions. As the wall-to-coolant temperature difference ratio increases, heat transfer coefficient decreases up to 10 percent with other parameters held constant.

1.
Bunker
R. S.
, and
Metzger
D. E.
,
1990
, “
Local Heat Transfer in Internally Cooled Turbine Airfoil Leading Edge Regions: Part I—Impingement Cooling Without Film Coolant Extraction
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
112
, pp.
451
458
.
2.
Chance
J. L.
,
1974
, “
Experimental Investigation of Air Impingement Heat Transfer Under an Array of Round Jets
,”
TAPPI
, Vol.
57
, No.
6
, pp.
108
112
.
3.
Chupp
R. E.
,
Helms
H. E.
,
McFadden
P. W.
, and
Brown
T. R.
,
1969
, “
Evaluation of Internal Heat Transfer Coefficients for Impingement Cooled Turbine Blades
,”
AIAA Journal of Aircraft
, Vol.
6
, pp.
203
-
208
, also AIAA Paper No. 68–564.
4.
Downs, S. J., and James, E. H., 1987, “Jet Impingement Heat Transfer—A Literature Survey,” ASME Paper No. 87-HT-35.
5.
Epstein, A. H., Kerrebrock, J. L., Koo, J. J., and Preiser, U. Z., 1985, “Rotational Effects on Impingement Cooling,” Proc. Symposium on Transport Phenomena in Rotating Machinery, Apr. 28–May 3, Honolulu, HI.
6.
Hrycak, P., 1981, “Heat Transfer From Impinging Jets, A Literature Review,” AFWAL-TR-81-3054.
7.
Kercher
D. M.
, and
Tabakoff
W.
,
1970
, “
Heat Transfer by a Square Array of Round Air Jets Impinging Perpendicular to a Flat Surface Including the Effect of Spent Air
,”
ASME Journal of Engineering for Power
, Vol.
92
, pp.
73
82
.
8.
Kline
S. J.
, and
McClintock
F. A.
,
1953
, “
Describing Uncertainties in Single-Sample Experiments
,”
Mechanical Engineering
, Vol.
75
, Jan., pp.
3
8
.
9.
Lucas, M. L., Ireland, P. T., Wang, Z., and Jones, T. V., 1992, “Fundamental Studies of Impingement Cooling Thermal Boundary Conditions,” AGARD 80th PEP Symposium, Paper No. 14.
10.
Martin, H., 1977, “Heat and Mass Transfer Between Impinging Gas Jets and Solid Surfaces,” Advances in Heat Transfer, Harnett, J. P., and Irvine Jr., T. F., eds., Academic Press, NY, Vol. 13, pp. 1–60.
11.
Metzger
D. E.
,
Yamashita
T.
, and
Jenkins
C. W.
,
1969
, “
Impingement Cooling of Concave Surfaces With Lines of Circular Air Jets
,”
ASME Journal of Engineering for Power
, Vol.
91
, No.
3
, pp.
149
158
.
12.
Obot, N. T., Mujumdar, A. S., and Douglas, W. J. M., 1980, “Design Correlations for Heat and Mass Transfer Under Various Turbulent Impinging Jet Configurations,” Drying ’80, Hemisphere, Vol. 1, pp. 388–402.
13.
Parsons, J. A., and Han, J. C., 1998, “Rotation Effect on Jet Impingement Heat Transfer in Smooth Rectangular Channels With Heated Target Walls and Radially Outward Cross Flow,” accepted for publication in the International Journal of Heat and Mass Transfer.
14.
Tabakoff
W.
, and
Clevenger
W.
,
1972
, “
Gas Turbine Blade Heat Transfer Augmentation by Impingement of Air Jets Having Various Configuration
,”
ASME Journal of Engineering for Power
, Vol.
94
, pp.
51
60
.
15.
Van Treuren
K. W.
,
Wang
Z.
,
Ireland
P. T.
, and
Jones
T. V.
,
1994
, “
Detailed Measurements of Local Heat Transfer Coefficient and Adiabatic Wall Temperature Beneath an Array of Impinging Jets
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
116
, pp.
369
374
.
16.
Viskanta
R.
,
1993
, “
Heat Transfer to Impinging Isothermal Gas and Flame Jets
,”
Experimental Thermal and Fluid Science
, Vol.
6
, pp.
111
134
.
17.
Wagner
J. H.
,
Johnson
B. V.
, and
Kopper
F. C.
,
1991
, “
Heat Transfer in Rotating Serpentine Passages With Smooth Walls
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
113
, pp.
321
330
.
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