Accurate Assessment of Joule-Thomson Inversion Temperature at Zero Pressure of Imperfect Gases

The aim of this work is to propose an approach for estimating the Joule-Thomson coefficient as an important parameter necessary to the study of changes in fluid temperature at a given change in pressure at constant enthalpy. The analytical approach presented in this work is very appropriate for detailed studies of the Joule-Thomson inversion temperature at zero pressure for arbitrary temperature values. A new approach is suggested for the accurate determination of the Joule-Thomson inversion temperature at zero pressure using the virial coefficient of the Lennard-Jones (12-6) potential. The usefulness and efficiency of the method are tested by application to various gase Ar, He,Ne,H2,O2,CO2CO,CH4,Xe, Kr,N2 and Air. The results obtained are in good agreement with other approximation and experimental data. The suggested formula enables correct and rapid calculation of the JT inversion temperature at zero pressure.