Thermal radiation in dense nano- and microparticulate media
Thermal radiation transport in dense nano/microparticulate media is considered. The particulates are both scattering and absorbing. Effective field approximation and quasicrystalline approximation are used to obtain the dispersion relation for electromagnetic wave in nano/microparticulate media. Nano/microparticles are considered due to their promise for future applications such as nanofluids and also for current technologies such as fluidized and packed beds combustors. Due to multiple and dependent scattering, the density of states, phase velocity, and group velocity of photons are modified. Modification of these parameters modifies the Planck blackbody equilibrium emissive power. Results show that heat flux and temperature predictions made by models in the literature for multiple and dependent scattering and absorption are not very accurate, as these models do not take the modification of equilibrium emissive power into account.