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TECHNICAL PAPERS: Porous Media, Particles, and Droplets

Analysis of In-Flight Oxidation During Reactive Spray Atomization and Deposition Processing of Aluminum

[+] Author and Article Information
J.-P. Delplanque

Division of Engineering, Colorado School of Mines, Golden, CO 80401-1887

E. J. Lavernia, R. H. Rangel

Department of Mechanical and Aerospace Engineering and Department of Chemical and Biochemical Engineering and Materials Science, University of California, Irvine, CA 92697-3975

J. Heat Transfer 122(1), 126-133 (Oct 19, 1999) (8 pages) doi:10.1115/1.521443 History: Received February 10, 1999; Revised October 19, 1999
Copyright © 2000 by ASME
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References

Figures

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Oxide, solid, and liquid regions in the droplet
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Numerical accuracy. Variations of the predicted droplet surface temperature for various time-steps and mesh spacings.
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Influence of size on predicted droplet velocity history (Cases 1–3). The correlated gas velocity is shown for reference.
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Influence of droplet size on predicted heat transfer coefficient (Cases 1–3)
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Predicted solidification behavior of a 80 μm Al droplet (Case 1)
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Computed radial temperature profile in a 80 μm Al droplet when recalescence starts (Cases 1 and 11)
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Heating rate history for a 120 μm Al droplet (Case 4)
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Solid fraction and heating rate history during recalescence in a 120 μm Al droplet (Case 4)
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Influence of droplet size on the predicted surface temperature history (Cases 5–7)
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Influence of droplet size on the predicted solid fraction history (Cases 5–7)
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Predicted oxide film thickness for a 50 μm Al droplet (140 K superheat) at selected oxygen volume fractions (Cases 8–10)
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Effect of oxidation on the predicted droplet surface temperature (Cases 5 and 10)
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Effect of droplet size on the predicted oxide film thickness for an Al droplet (140 K superheat, 10 vol. percent O2; Cases 10, 12, and 13)
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Effect of superheat on the predicted oxide film thickness for a 50 μm Al droplet (10 vol. percent O2; Cases 8–10)
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Comparison of the predicted oxide film thickness with the observed thickness of oxide stringers (10 vol. percent O2; Cases 10, 12, and 13)
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Variations of predicted oxide volume fraction for a 50 μm Al droplet and measured grain size with atomization gas O2 content (Cases 5, 8, 9, and 10)

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