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TECHNICAL PAPERS: Forced Convection

Unsteady Heat Transfer Analysis of an Impinging Jet

[+] Author and Article Information
Yongmann M. Chung, Kai H. Luo

Department of Engineering, Queen Mary, University of London, London E1 4NS, U.K.

J. Heat Transfer 124(6), 1039-1048 (Dec 03, 2002) (10 pages) doi:10.1115/1.1469522 History: Received January 16, 2001; Revised November 06, 2001; Online December 03, 2002
Copyright © 2002 by ASME
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References

Figures

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Impinging slot jet configuration
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Comparison with experimental data at Re=500. Symbols are the experimental data of Sparrow and Wong 26 at Re=450.
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Instantaneous scalar field of the impinging jet flow
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Time history of temperature (at y≈0.02) at several locations on the impinging wall for Ly/D=10: (a) Re=300, (b) 500, and (c) 1000.
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Time history of temperature (at y≈0.01) at several locations on the impinging wall for Ly/D=4: (a) Re=300, (b) 500, and (c) 1000.
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Nusselt number distributions along the impinging wall for (Ly/D=10): (a) time-mean Nusselt number, and (b) fluctuating Nusselt number.
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Instantaneous Nusselt number along the impinging wall for Re=300 (Case 1): (a) temperature-decreasing phase (47.34≤t≤50.32), and (b) increasing phase (50.32≤t≤54.15). Time increment between each line is 0.467.
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Instantaneous Nusselt number along the impinging wall for Re=500 (Case 2): (a) temperature-decreasing phase (34.66≤t≤38.06), and (b) increasing phase (38.06≤t≤41.38). Time increment between each line is 0.326.
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Instantaneous Nusselt number along the impinging wall for Re=1000 (Case 3): (a) temperature-decreasing phase (32.00≤t≤36.32), and (b) increasing phase (36.32≤t≤40.65). Time increment between each line is 0.480.
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Time history of the instantaneous stagnation Nusselt number for Re=500. Open circles indicate the time instants examined in Fig. 11.
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Temperature (left) and vorticity (right) contour lines at several time instants for Re=500: at (a) P1, (b) P2, (c) P4, (d) P5.
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Instantaneous flow and temperature field at P5: (a) temperature contour lines, and (b) vector plot.

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