Wide band k distribution model for radiative properties of gas and particle mixtures

A new wide band k-distribution model was developed, in which the k-distribution absorption coefficients of carbon dioxide and vapor in ten main bands were expressed in polynomial functions. The absorption coefficient and scattering coefficient of particle were assumed gray in each band. The heat flux for gas and particle mixtures was computed by using the wide band k-distribution model and compared with that obtained by using line-by-line calculations. Comparison result showed that the relative errors of the wide band k-distribution model were very small. The new wide band k-distribution model and the polynomial functions could be used to calculate radiative properties of gases with higher accuracy while the time for calculation was reduced significantly. Furthermore, the wide bank k-distribution model could also be used for gas and particle mixtures.