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Research Papers: Jets, Wakes, and Impingement Cooling

Effect of Temperature Ratio on Jet Array Impingement Heat Transfer

[+] Author and Article Information
Matt Goodro

Department of Engineering Science, Oxford University, Parks Road, Oxford OX1 3PJ, UK

Jongmyung Park

 Korea Institute of Geoscience and Mineral Resources (KIGAM), 30 Gajeong-dong, Yuseong-gu, Daejeon, 305-350, Korea

Phil Ligrani1

Department of Engineering Science, Oxford University, Parks Road, Oxford OX1 3PJ, UKphil.ligrani@eng.ox.ac.uk

Mike Fox, Hee-Koo Moon

Aero∕Thermal and Heat Transfer, Solar Turbines, Inc., 2200 Pacific Highway, P.O. Box 85376, Mail Zone C-9, San Diego, CA 92186-5376

1

Corresponding author.

J. Heat Transfer 131(1), 012201 (Oct 21, 2008) (10 pages) doi:10.1115/1.2977546 History: Received January 04, 2008; Revised May 20, 2008; Published October 21, 2008

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 X is 8D, and the spanwise spacing between holes in a given streamwise row Y is also 8D. The target plate is located 3D away from the impingement hole exits. Experimental results show that local, line-averaged, and spatially averaged Nusselt numbers decrease as the TwaTj 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.

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Figures

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Figure 1

Impingement flow facility

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Figure 2

Impingement flow facility test section, including impingement plenum, and impingement channel

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Figure 3

Impingement test plate configuration

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Figure 4

Comparison of baseline Nusselt number data with the correlation of Florschuetz (9) for Rej=34,500, Ma approximately equal to 0, and an array of jets with X=5D, Y=4D, and Z=3D

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Figure 5

(a) Crossflow-to-jet mass velocity ratio distribution in the streamwise direction determined experimentally. (b) Crossflow-to-jet mass velocity ratio distribution in the streamwise direction predicted using the correlation of Florscheutz (9). (c) Discharge coefficient for Rej=18,100, Ma=0.2, and Twa∕Tj=1.06, 1.25, 1.36, 1.46, 1.58, and 1.73.

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Figure 6

Spatially resolved surface Nusselt number distributions for Rej=18,000, Ma=0.2, and Twa∕Tj=1.06, 1.25, 1.36, 1.46, 1.58, and 1.73

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Figure 8

Surface Nusselt number variations with x∕D, which are line averaged over y∕D from −8.0 to +8.0 for Rej=18,000, Ma=0.2, and Twa∕Tj=1.08, 1.25, 1.37, and 1.73

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Figure 9

Spatially averaged Nusselt numbers as dependent on x∕D for Rej=18,000, Ma=0.2, and Twa∕Tj=1.06, 1.25, 1.36, 1.46, 1.58, and 1.73

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Figure 10

Local area-averaged Nusselt numbers as dependent on temperature ratio Twa∕Tj for Rej=18,000 and Ma=0.2

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Figure 11

Nusselt number ratio data at specific x∕d locations correlated with respect to temperature ratio, Twa∕Tj

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Figure 7

Local surface Nusselt number variations for Rej=18,000, Ma=0.2, and Twa∕Tj=1.06, 1.25, 1.36, 1.46, 1.58, and 1.73. (a) Variations with y∕D for x∕D=32. (b) Variations with x∕D for y∕D=8.

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