A new model for radiation heat transfer in emitting, absorbing and anisotropically scattering media based on the concept of mean beam length

Abstract A model to evaluate the total emissivity of an isothermal, gray, anisotropically scattering particle–gas mixture is illustrated. Based on the assumption, that the absorption path length differs from emission path length due to scattering, a mean beam length for the scattering medium is obtained. Comparison with exact results computed with a Monte Carlo technique showed good agreement in total emissivities when the mean beam length which is known from gas radiation is used. The influence of scattering albedo and scattering phase function is presented.