Abstract
In recent years, a number of analytical and numerical models have been dedicated to characterization of radiative properties of open-cell foams. In the current study, a review of different numerical and analytical methods is proposed, explaining the methodologies and evidencing the common points, limits and assumptions. Numerical methodologies are firstly applied to sets of spherical particles and compared with benchmark exact analytical solution. In a second step 3D Voronoi open cell foams are generated, the various methods analyzed are tested and compared. Some attention is dedicated to the evaluation of effects due to varying degrees of irregularity in the structure and ligament. Finally, a new analytical law is proposed to determine radiative extinction coefficient of 3D Voronoi open cell foam without significant additional computational effort. This relation is expected to be useful for preliminary optimization/design purposes.
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