An Extended Corresponding States Model For Predicting Thermodynamic Properties of the N2-Ar-O2 Mixture

Abstract

Abstract A new model for the prediction of the thermodynamic properties of binary and ternary mixtures in the nitrogen-argon-oxygen system has been developed using an extended corresponding states model. The model accurately represents single phase mixture properties over a wide composition spectrum for liquid and vapor states for binary mixtures. The model also accurately predicts properties of the ternary mixture representing air. Heat capacities, entropies, and energies can be calculated using the model. Nitrogen is used as a reference fluid for calculating mixture properties. Estimates for the equivalent-substance reducing ratios for the mixture are calculated with van der Waals mixing rules. Empirical temperature-dependent binary interaction parameters are used to improve the agreement of calculated mixture properties with available experimental binary P-p-T-x data. Comparisons of calculated properties to available mixture data are summarized to verify the accuracies of predicted properties.