Based on traditional flux method,a source six flux(SSF) model in cylindrical coordinate is proposed for arbitrary directional radiative intensity.Basic theory and numerical procedure of SSF model are presented in detail.Compared with directional radiative intensity by two flux method(TFM) and Backward Monte Carlo(BMC) method in cylindrical media,results of SSF method agree well with those of BMC.However,SSF method is more efficient than BMC,thus SSF method is more suitable in solving directional radiative intensity problems.

The finite element method is applied to solve the radiative heat transfer equation and energy conservation equation discretely.This paper provides an exact solution of the mean incident intensity and the temperature distribution in a rectangular geometry in a absorbing,emitting,isotropically scattering media enclosed by black and gray diffuse surfaces.The validity of this method is examined by comparing the present results with the those available of Monte Carlo simulation (M-C).Numerical results show that the present method can satisfactorily predict the radiation transfer.