Calculation of Joule-Thomson inversion curves for two-phase mixtures

摘要: The Joule-Thomson inversion curve (JTIC), defined as the locus in p-T plane where adiabatic (JT) coefficient is zero, separates regions for which heating and cooling occur upon an isenthalpic expansion. JTIC calculation mixtures a clear matter single-phase conditions. For two-phase mixtures, apparent JT can be defined, incorporates: (i) effects (ii) phase distribution changes effects. Three different ways calculating are presented: volumetric approach, approach based on enthalpy departure variation, flashes. Cubic equations of state used this work, but any thermodynamic model used. Several examples show that separating heating/cooling may have two or three distinct branches, at boundaries there discontinuities corresponding to angular points variations.