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Titre :
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Experimental and numerical determination of thermal radiative properties of ZnO particulate media
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Auteurs :
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P. Coray, Auteur ;
W. Lipinski, Auteur ;
A. Steinfeld, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Journal of heat transfer (Vol. 132 N° 1, Janvier 2010)
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Article en page(s) :
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pp. [012701-1/6]
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Note générale :
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Physique
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Langues :
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Anglais
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Index. décimale :
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536 (Chaleur. Thermodynamique)
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Tags :
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Radiation Radiometry Radiative spectroscopy Monte Carlo Zinc oxide packed-bed
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Résumé :
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The radiative characteristics of dependently scattering packed-beds of ZnO particles, applied in the design of high-temperature solar thermochemical reactors, were investigated experimentally. ZnO samples of varying thickness were exposed to a continuous beam of near monochromatic thermal radiation in the 0.5–1 µm wavelength range. The overall transmitted fraction measured as a function of sample thickness s obeys an exponential trend exp(−As), with the fit parameter A ranging from 4000±100 m−1 at 555 nm to 2100±100 m−1 at 1 µm. In the forward directions, the measured intensity distribution is approximately isotropic, whereas in the backward directions it is well approximated by a Henyey–Greenstein equation with asymmetry factors g[approximate]−0.4 at 555 nm and g[approximate]−0.1 at 1 µm. A Monte Carlo ray-tracing model of the experimental setup is employed to extract the extinction coefficient and the scattering albedo for the case of a nongray absorbing-scattering medium.
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DEWEY :
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536
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ISSN :
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0022-1481
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En ligne :
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http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode=strresults&sort=chron&maxdisp=25&threshold=0&pjournals=JBENDY&pjournals=JHTRAO&pyears=2010&possible1zone=article&fromyear=2010&frommonth=Jan&fromvolume=132&fromissue=1&OUTLOG=
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