This paper consider the effects of temperature ratio on the heat transfer from an array of jets impinging on a flat plate. At a constant Reynolds number of 18,000 and a constant Mach number of 0.2, different ratios of target plate temperature to jet temperature are employed. The spacing between holes in the streamwise direction is , and the spanwise spacing between holes in a given streamwise row is also . The target plate is located away from the impingement hole exits. Experimental results show that local, line-averaged, and spatially averaged Nusselt numbers decrease as the temperature ratio increases. This is believed to be due to the effects of temperature-dependent fluid properties, as they affect local and global turbulent transport in the flow field created by the array of impinging jets. The effect of temperature ratio on crossflow-to-jet mass velocity ratio and discharge coefficients is also examined.
1.
Martin
, H.
, 1977, “Heat and Mass Transfer Between Impinging Gas Jets and Solid Surfaces
,” Adv. Heat Transfer
0065-2717, 13
, pp. 1
–60
.2.
Schulz
, A.
, 2001, “Combustor Liner Cooling Technology in Scope of Reduced Pollutant Formation and Rising Thermal Efficiencies
,” Ann. N.Y. Acad. Sci.
0077-8923, 934
, pp. 135
–146
.3.
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 J. Eng. Power
0022-0825, 92
, pp. 73
–82
.4.
Metzger
, D. E.
, Yamashita
, T.
, and Jenkins
, C.
, 1971, “Impingement Cooling of Concave Surfaces With Lines of Circular Air Jets
,” ASME J. Eng. Power
0022-0825, 91
, pp. 149
–158
.5.
Chupp
, R.
, Helms
, H.
, McFadden
, P.
, and Brown
, T.
, 1969, “Evaluation of Internal Heat-Transfer Coefficients for Impingement Cooled Turbine Airfoils
,” J. Aircr.
0021-8669, 6
(3
), pp. 203
–208
.6.
Metzger
, D. E.
, and Korstad
, R.
, 1972, “Effects of Crossflow on Impingement Heat Transfer
,” ASME J. Eng. Power
0022-0825, 94
, pp. 35
–41
.7.
Chance
, J. L.
, 1974, “Experimental Investigation of Air Impingement Heat Transfer Under an Array of Round Jets
,” Tappi J.
0734-1415, 57
(6
), pp. 108
–112
.8.
Metzger
, D. E.
, Florschuetz
, L. W.
, Takeuchi
, D. I.
, Behee
, R. D.
, and Berry
, R. A.
, 1979, “Heat Transfer Characteristics for Inline and Staggered Arrays of Circular Jets With Crossflow of Spent Air
,” ASME Trans. J. Heat Transfer
0022-1481, 101
, pp. 526
–531
.9.
Florschuetz
, L. W.
, Truman
, C. R.
, and Metzger
, D. E.
, 1981, “Streamwise Flow and Heat Transfer Distributions for Jet Array Impingement With Crossflow
,” ASME Trans. J. Heat Transfer
0022-1481, 103
, pp. 337
–342
.10.
Lee
, D. H.
, Song
, J.
, and Jo
, M. C.
, 2004, “The Effects of Nozzle Diameter on Impinging Jet Heat Transfer and Fluid Flow
,” ASME J. Heat Transfer
0022-1481, 126
(4
), pp. 554
–557
.11.
Garimella
, S. B
, and Nenaydykh
, B.
, 1996, “Nozzle-Geometry Effects in Liquid Jet Impingement Heat Transfer
,” Int. J. Heat Mass Transfer
0017-9310, 39
(14
), pp. 2915
–2923
.12.
Shuja
, S. Z.
, Yilbas
, B. S.
, and Budair
, M. O.
, 2005, “Influence of Conical and Annular Nozzle Geometric Configurations on Flow and Heat Transfer Characteristics Due to Flow Impingement Onto a Flat Plate
,” Numer. Heat Transfer, Part A
1040-7782, 48
(9
), pp. 917
–939
.13.
Siba
, E. A.
, Ganesa-Pillai
, M.
, Harris
, K. T.
, and Haji-Sheikh
, A.
, 2003, “Heat Transfer in a High Turbulence Air Jet Impinging Over a Flat Circular Disk
,” ASME J. Heat Transfer
0022-1481, 125
(2
), pp. 257
–265
.14.
Chung
, Y. M.
, and Luo
, K. H.
, 2002, “Unsteady Heat Transfer Analysis of an Impinging Jet
,” ASME J. Heat Transfer
0022-1481, 124
(6
), pp. 1039
–1048
.15.
Abdon
, A.
, and Sundén
, B.
, 2001, “Numerical Investigation of Impingement Heat Transfer Using Linear and Non-Linear Two-Equation Turbulence Models
,” Numer. Heat Transfer, Part A
1040-7782, 40
(6
), pp. 563
–578
.16.
Tong
, A. Y.
, 2003, “A Numerical Study on the Hydrodynamics and Heat Transfer of a Circular Liquid Jet Impinging Onto a Substrate
,” Numer. Heat Transfer, Part A
1040-7782, 44
(1
), pp. 1
–19
.17.
Laschefski
, H.
, Cziesla
, T.
, Biswas
, G.
, and Mitra
, N. K.
, 1996, “Numerical Investigation of Heat Transfer by Rows of Rectangular Impinging Jets
,” Numer. Heat Transfer, Part A
1040-7782, 30
(1
), pp. 87
–101
.18.
Seyedein
, S. H.
, Hasan
, M.
, and Mujumdar
, A. S.
, 1995, “Turbulent Flow and Heat Transfer From Confined Multiple Impinging Slot Jets
,” Numer. Heat Transfer, Part A
1040-7782, 27
(1
), pp. 35
–51
.19.
Rhee
, D. H.
, Yoon
, P. H.
, and Cho
, H. H.
, 2003, “Local Heat∕Mass Transfer and Flow Characteristics of Array Impinging Jets With Effusion Holes Ejecting Spent Air
,” Int. J. Heat Mass Transfer
0017-9310, 46
(6
), pp. 113
–125
.20.
Obot
, N. T.
, and Trabold
, T. A.
, 1987, “Impingement Heat Transfer Within Arrays of Circular Jets—Part I: Effects of Minimum, Intermediate, and Complete Crossflow for Small and Large Spacings
,” ASME Trans. J. Heat Transfer
0022-1481, 109
, pp. 872
–879
.21.
Bunker
, R.
, and Metzger
, D. E.
, 1990, “Local Heat Transfer in Internally Cooled Turbine Airfoil Leading Edge Regions—Part I: Impingement Cooling Without Film Extraction
,” ASME J. Turbomach.
0889-504X, 112
, pp. 451
–458
.22.
Fox
, M. D.
, Kurosaka
, M.
, Hedges
, L.
, and Hirano
, K.
, 1993, “The Influence of Vortical Structures on the Thermal Fields of Jets
,” J. Fluid Mech.
0022-1120, 255
, pp. 447
–472
.23.
Bailey
, J. C.
, and Bunker
, R. S.
, 2002, “Local Heat Transfer and Flow Distributions for Impinging Jet Arrays of Dense and Sparse Extent
,” ASME Paper No. ASME GT-2002-30473.24.
Taslim
, M. E.
, Pan
, Y.
, and Bakhtari
, K.
, 2002, “Experimental Racetrack Shaped Jet Impingement on a Roughened Leading-Edge Wall With Film Holes
,” ASME Paper No. GT-2002-30477.25.
Li
, X.
, Gaddis
, J. L.
, and Wang
, T.
, 2002, “Mist∕Stream Heat Transfer With Jet Impingement Onto a Concave Surface
,” ASME Paper No. GT-2002-30475.26.
Brevet
, P.
, Dejeu
, C.
, Dorignac
, E.
, Jolly
, M.
, and Vullierme
, J. J.
, 2002, “Heat Transfer to a Row of Impinging Jets in Consideration of Optimization
,” Int. J. Heat Mass Transfer
0017-9310, 45
, pp. 4191
–4200
.27.
Brevet
, P.
, Dorignac
, E.
, and Vullierme
, J. J.
, 2001, “Mach Number Effect on Jet Impingement Heat Transfer
,” Ann. N.Y. Acad. Sci.
0077-8923, 934
, pp. 409
–416
.28.
Florschuetz
, L. W.
, and Su
, C. C.
, 1987, “Effects of Crossflow Temperature on Heat Transfer Within an Array of Impinging Jets
,” ASME Trans. J. Heat Transfer
0022-1481, 109
, pp. 74
–82
.29.
Kline
, S. J.
, and McClintock
, F. A.
, 1953, “Describing Uncertainties in Single Sample Experiments
,” Mech. Eng. (Am. Soc. Mech. Eng.)
0025-6501, 75
, pp. 3
–8
.30.
Moffat
, R. J.
, 1988, “Describing the Uncertainties in Experimental Results
,” Exp. Therm. Fluid Sci.
0894-1777, 1
(1
), pp. 3
–17
.31.
Park
, J.
, Goodro
, M.
, Ligrani
, P. M.
, Fox
, M.
, and Moon
, H.-K.
, 2007, “Separate Effects of Mach Number and Reynolds Number on Jet Array Impingement Heat Transfer
,” ASME J. Turbomach.
0889-504X, 129
, pp. 269
–280
.Copyright © 2009
by American Society of Mechanical Engineers
You do not currently have access to this content.
