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Highly porous fibrous materials present thermal insulating performance for use in aerospace, automotive, marine, and building applications. Building thermal insulation is a main scope of applications (see the article Spectral radiative properties of some important materials: Experimental data and theoretical models). It can be noted that glass wools are the most widely sold materials for the building thermal insulation. The radiative properties of fibrous media containing glass–wool or carbon or aramid fibers can be modeled using the absorption and scattering characteristics of infinite circular cylinders, which can be randomly oriented or have particular orientations inducing an isotropic or anisotropic structure, respectively. T ...

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