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TECHNICAL PAPERS: Radiative Heat Transfer

Directional Spectral Emittance of a Packed Bed: Correlation Between Theoretical Prediction and Experimental Data

[+] Author and Article Information
Rogério Lopes, Luı́s M. Moura, Dominique Baillis, Jean-François Sacadura

Institut National des Sciences Appliquées de Lyon, Center de Thermique de Lyon (CETHIL), UPRESA CNRS Q5008, 20, avenue Albert Einstein 69621 Villeurbanne Cedex, France

J. Heat Transfer 123(2), 240-248 (Jul 07, 2000) (9 pages) doi:10.1115/1.1338134 History: Received November 23, 1999; Revised July 07, 2000
Copyright © 2001 by ASME
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References

Figures

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Picture of packed spheres sample (#3): magnification is 45; scale bar depicts 100 μm.
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Experimental device using a FTIR spectrometer to measure spectral bidirectional reflectance for plane of incidence 17
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Particle spectral hemispherical reflectivity: values obtained from the parameter estimation approach.
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Experimental and theoretical reflectance for sample 1 for an angle of 170 deg with the incident direction
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Experimental device used to measure directional spectral emission. The radio-spectrometer and the pyrometer are rotated to acquire the measurement on the blackbody.
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Comparison of measured and predicted spectral directional emittance of sample 1 (L=3.24 mm,fv=0.768,d=100 μm, and T=870 K)
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Comparison of measured and predicted spectral directional emittance of sample 2 (L=2.93 mm,fv=0.730,d=200 μm, and T=917 K)
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Comparison of measured and predicted spectral directional emittance of sample 3 (L=2.94 mm,fv=0.689,d=300 μm, and T=890 K)
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Comparison of measured and predicted spectral directional emittance of sample 4 (L=4.91 mm,fv=0.612,d=400 μm, and T=888 K)
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Relative difference between measured and predicted spectral directional emittance of sample 1 (L=3.24 mm,fv=0.768,d=100 μm, and T=870 K)
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Relative difference between measured and predicted spectral directional emittance of sample 2 (L=2.93 mm,fv=0.730,d=200 μm, and T=917 K)
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Relative difference between measured and predicted spectral directional emittance of sample 3 (L=2.94 mm,fv=0.689,d=300 μm, and T=890 K)
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Relative difference between measured and predicted spectral directional emittance of sample 4 (L=4.91 mm,fv=0.612,d=400 μm, and T=888 K)

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