Radiative heat transfer in nonhomogeneous gases - A simplified approach

Neither narrow-band nor wide-band models are necessary to model accurately nonhomogeneous effects on radiative heat transfer in high temperature combustion gases. The article demonstrates the ability of a simplified model, using total transmittance data, to predict the radiance emanating from nonisothermal, variable-concentration carbon dioxide and water-vapor mixtures. Computational times using the simplified approach are over two orders of magnitude less than that required by the Goody statistical narrow-band model with Curtis-Godson approximation, with a sacrifice in accuracy of less than 10%. The total transmittance nonhomogeneous model has been verified for pathlengths between 20 and 200 cm, temperatures between 800 and 1800 K, and CO2/H2O ratios between 1/2 and 2.