Experimental Determination of the Extinction Coefficient for a Packed-Bed Particulate Medium

Authors: Osinga, T.¹; Lipinski, W.¹; Guillot, E.²; Olalde, G.²; Steinfeld, A.³

Source: Experimental Heat Transfer, Volume 19, Number 1, January-March 2006 , pp. 69-79(11)

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Abstract:

The extinction coefficient of a powder mixture of ZnO and beech charcoal is determined at ambient temperature using two experimental set-ups: (a) radiation in the range 500–1000 nm is captured by a 200 μm-diameter fiber optic and sent to a spectrometer equipped with a Si/PbSe detector; (b) radiation in the range 350–1100 nm is captured by a 5 mm-diameter Si-photodiode. Both set-ups measure the attenuation of intensity from a 3273 K blackbody source. The experimental results are implemented in the numerical solution of the equation of radiative transfer, using the Monte-Carlo ray-tracing technique. The extinction coefficient is determined to be 10103 ± 615 m −1 at 1000 nm using set up (a), and 7850 ± 337 m −1 for the range 350–1100 nm using the more accurate set-up (b).

Keywords: thermal radiation; extinction coefficient; Monte Carlo; porous media; packed bed

Document Type: Research article

DOI: http://dx.doi.org/10.1080/08916150500318398

Affiliations: 1: Department of Mechanical and Process Engineering, ETH-Swiss Federal Institute of Technology Zurich, Zurich, Switzerland 2: Processes, Materials and Solar Energy Laboratory, PROMES-CNRS, Odeillo, France 3: Solar Technology Laboratory, Paul Scherrer Institute, Villigen, Switzerland

Publication date: 2006-01-01

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