On the use of polynomial chaos expansions and generalized moments within the frame of gas radiation in non-uniform media

•The CDPC approach is introduced.•It uses polynomial chaos and generalized moments to approximate narrow band gas transmissivities.•The approach provides result as accurate as usual C-k models (uniform and non-uniform media).•The approach is less computationally expensive than usual C-k models in uniform media.

In many applications involving gaseous media at high temperature, accurate but computationally efficient models are required for the radiative properties of gases. The aim of the present work is to show how, by combining results from Polynomial Chaos framework and Devyatov׳s Method Of Moments, one can provide simple estimates of the transmission functions of gases both in uniform and non-uniform media. The proposed model only involves polynomials. It is probably one of the simplest in terms of mathematical formulation but also one of the most sophisticated, considering the concepts that it involves. It can be applied in uniform and non-uniform media, where it is shown to be equivalent, in terms of accuracy, to usual C-k models.