PREDICTION OF TRANSPORT PROPERTIES FOR MULTICOMPONENT CRYOGENIC MIXTURES USED IN J-T CRYOCOOLERS

摘要

The Enskog dense-gas theory combined with an equation of state is a convenient and efficient method for predicting the transport properties of multicomponent mixtures. In this paper, an empirical modification of the Enskog equation is proposed to improve the prediction accuracy of the viscosity coefficient and thermal conductivity for mixtures. Extensive comparisons with experimental data are made for a wide range of fluid states for two mixtures. The total average absolute deviations are 2.88% and 1.63% for viscosity, and 0.81% and 3.69% for thermal conductivity, respectively. The proposed procedure for predicting the viscosity and thermal conductivity of mixtures is simple and straightforward.