IDENTIFICATION OF THE EFFECTIVE RADIATIVE PROPERTIES OF A HOT, THICK,POROUS-MEDIUM

An inversion method is used to; determine the spectral radiative prope rties (scattering albedo, extinction coefficient, and Henyey-Greenstei n asymmetry factor) of a packed bed of stainless steel spheres. Spectr al and directional experimental data for the intensity exiting the bed were compared to Radiative Transfer Equation (RTE) discrete ordinates method solutions in a nonlinear least-squares algorithm (modified Lev enberg-Marquardt) to identify the radiative properties. The properties resulting from the inversion method showed a higher scattering albedo , more forward scattering phase function, and higher extinction coeffi cient than those calculated using either independent scattering theory or the correlated scattering theory of Kamiuto. (C) 1998 Elsevier Sci ence Ltd. All rights reserved.