Modeling and experimental evaluation of the thermal insulation properties of mineral wool products at high temperature

摘要

We have studied radiative transfer through insulating materials made of fibres and slugs (modeled respectively as infinite cylinders and spheres) at elevated temperatures. The same theoretical analysis is used for both fibers and spheres: Kerker-Mie theory is applied to determine the radiative coefficients of each type of particle, from the bulk glass complex refractive index and the fiber and slug diameter spectrum. Average radiative coefficients are determined for both fibers and slugs. The independent scattering hypothesis enables us to derive the total radiative coefficients of the whole material using a mass weighted average.