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TECHNICAL PAPERS: Jets, Wakes, and Impingements

Influence of Inflow Disturbances on Stagnation-Region Heat Transfer

[+] Author and Article Information
S. Bae

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea

S. K. Lele

Department of Mechanical Engineering, Stanford University, Stanford, CA 94309

H. J. Sung

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon 305-701, Koreae-mail: hjsung@kaist.ac.kr

J. Heat Transfer 122(2), 258-265 (Nov 29, 1999) (8 pages) doi:10.1115/1.521486 History: Received February 27, 1999; Revised November 29, 1999
Copyright © 2000 by ASME
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References

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Kestin,  J., 1966, “The Effect of Free-Stream Turbulence on Heat Transfer Rates,” Adv. Heat Transfer, 3, pp. 1–32.
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Ames, F. E., and Moffat, R. J., 1990, “Heat Transfer With High Intensity, Large Scale Turbulence: The Flat Plate Turbulent Boundary Layer and the Cylindrical Stagnation Point,” Report No. HMT-43, Thermosciences Division of Mechanical Engineering, Stanford University, Stanford, CA.
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Figures

Grahic Jump Location
Schematic diagram of flow configuration with organized inflow disturbances
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(a) Comparison of the present code with the preverified Mahesh’s code. (b) Comparison of present results with Reshotko’s results. ηs is the self-similar coordinate and f(ηs) is the self-similarity solution, after Stewartson’s transformation.
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Variations of ΔSt against λ/δ for A=0.25
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Contours of streamwise vorticity (ωx) in y-z plane at x=δ for A=0.25 and Re=20,000 (a) λ/δ=2.1, (b) λ/δ=4.0, and (c) λ/δ=10.6. The tick mark spacing is 0.707. (a) The maximum contour value is 2.8 and the minimum is −2.8, (b) the maximum value is 9.6 and the minimum is −9.6, and (c) the maximum value is 12.0 and the minimum is −12.0.
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Contours of temperature in the y-z plane at x=δ for A=0.25 and Re=20,000. (a) λ/δ=2.1, (b) λ/δ=4.0, and (c) λ/δ=10.6. The tick mark spacing is 0.707. The maximum value is 1.0 in the freestream and the minimum is 0.8 at the wall.
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Variations of streamwise vorticity (ωx) at the z-location where the core of streamwise vortex is located for Re=10,000 and A=0.25 ((a) λ/δ=3.2 and 4.0; (b) λ/δ=7.4 and 10.6)
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Schematic diagram for four regions and the circulation Γ
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(a) Variations of Γ against −vTmax/(SδΔT) in region 1. (b) Variations of ΔSt against −vTmax/(SδΔT).
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Variations of normalized streamwise vorticity (ωxxln) with three different magnitudes at a z-location where the core of streamwise vortex is located for Re=5000 ((a) λ/δ=3.2; (b) λ/δ=5.3)
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Plot of ΔFr/Frlam against Re for A=0.25.ΔFr=Fr−Frlam.
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Plot of Fr/Frlam against λ/δ for A=0.25
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Plot of Fr against A Re5/12(λ/L)−1/3

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