Radiative heat transfer through composite materials

摘要: Radiative heat transfer in inhomogeneous materials is governed by the photon mean free path. For long‐wave photons, path depends on size and shape of individual grains and, where applicable, voids. Long‐wave photons have long paths play an important role transfer. In some cases they cause radiative thermal conductivity at moderately high temperatures to be larger than one would expect extrapolating from highest (above 2000 °K) according a T3 law. Some special are treated including polycrystalline solids, densely packed powders, foams, fibrous aggregates.