METALLIC FOAMS RADIATIVE PROPERTIES / COMPARISON BETWEEN DIFFERENT MODELS
The aim of this study is to determine the radiative properties of highly porous open cells aluminium foam, thanks to more or less simple predictive models, and to compare all these models.
The extinction coefficient, the scattering albedo and the scattering phase function are predicted using geometric optics laws to model the interaction of radiation with the particles forming the foam. Moreover, the particles forming the foam are large compared to the wavelength considered and are supposed to be sufficiently distant from each other to scatter radiation independently. Thus, the characteristics of the foam can be determined by adding the contributions of each particle.
A particular attention is paid on microstructure analysis and modelling. We considered different kind of cells shapes and of struts cross-section, using microscopic and tomographic analysis. Furthermore, a new phase function modelling is presented.
Finally, we compare the results of each method with the radiative properties obtained thanks to experimental directional and hemispherical transmittances and reflectances