Experimental and numerical determination of thermal radiative properties of ZnO particulate media / P. Coray in Journal of heat transfer, Vol. 132 N° 1 (Janvier 2010)  

Public ISBD [article]  inJournal of heat transfer > Vol. 132 N° 1 (Janvier 2010) . - pp. [012701-1/6] Titre : Experimental and numerical determination of thermal radiative properties of ZnO particulate media Type de document : texte imprimé Auteurs : P. Coray, Auteur ; W. Lipinski, Auteur ; A. Steinfeld, Auteur Article en page(s) : pp. [012701-1/6] Note générale : Physique Langues : Anglais (eng) Mots-clés : Radiation Radiometry Radiative spectroscopy Monte Carlo Zinc oxide packed-bed Index. décimale : 536 Chaleur. Thermodynamique Résumé : 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. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...] [article] Experimental and numerical determination of thermal radiative properties of ZnO particulate media [texte imprimé] / P. Coray, Auteur ; W. Lipinski, Auteur ; A. Steinfeld, Auteur . - pp. [012701-1/6]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 132 N° 1 (Janvier 2010) . - pp. [012701-1/6] Mots-clés : Radiation Radiometry Radiative spectroscopy Monte Carlo Zinc oxide packed-bed Index. décimale : 536 Chaleur. Thermodynamique Résumé : 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. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

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