Prediction of the gaseous thermal conductivity in aerogels with non-uniform pore-size distribution

► We proposed a modified model to improve the prediction accuracy of the gaseous thermal conductivity of aerogels. ► The present model takes into account the effect of non-uniform and random pore-size distribution of the aerogels. ► Available experimental data and results were employed to verify the present model. ► The present model can effectively predict gaseous thermal conductivities of various types of aerogels.