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TECHNICAL PAPERS: Porous Media

Directional Spectral Emittance of a Packed Bed: Influence of the Temperature Gradient in the Medium

[+] Author and Article Information
Dominique Baillis, Jean-François Sacadura

Center de Thermique de Lyon (CETHIL), UMR CNRS 5008, Institut National des Sciences Appliquées de Lyon, 20, avenue Albert Einstein 69621, Villeurbanne Cedex, France

J. Heat Transfer 124(5), 904-911 (Sep 11, 2002) (8 pages) doi:10.1115/1.1466459 History: Received December 15, 2000; Revised October 12, 2001; Online September 11, 2002
Copyright © 2002 by ASME
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References

Figures

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Emittance measurement system (Lopes et al. 11)
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Particle hemispherical reflectivity for Samples A and B (Lopes et al. 7)
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(a) Sample A-temperature profile for cases 3 and 5; and (b) Sample B-temperature profile for cases 3 and 5.
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(a) Sample A-relative deviation between the emittance of case 3 and one of cases i=2,4,5 for λ=3 μm; and (b) Sample B-relative deviation between the emittance of case 3 and one of cases i=2,4,5 for λ=3 μm.
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(a) Sample A emittance polar distribution for λ=3 μm; and (b) Sample B emittance polar distribution for λ=3 μm.
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Sample A-relative deviation between the normalized temperature profiles T of case 3 and cases i=6 to 12: (a) Δxi/xi=+5 percent; and (b) Δxi/xi=−5 percent.
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Sample B-relative deviation between the normalized temperature profiles T of case 3 and cases i=6 to 12: (a) Δxi/xi=+5 percent; and (b) Δxi/xi=−5 percent.
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Sample A-relative deviation between the emittance of case 3 and one of cases i=6 to 12 for λ=3 μm: (a) Δxi/xi=+5 percent; and (b) Δxi/xi=−5 percent.
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Sample B-relative deviation between the emittance of case 3 and one of cases i=6 to 12 for λ=3 μm: (a) Δxi/xi=+5 percent; and (b) Δxi/xi=−5 percent.

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