Predicting the Virial coefficients and thermodynamic properties of a multicomponent mixture with application to the ternary mixture of CH{sub 2}F{sub 2} + CF{sub 3}CHF{sub 2} + CF{sub 3}CH{sub 2}F
- National Inst. of Standards and Technology, Gaithersburg, MD (United States)
A model for estimating second and third virial coefficients, which has been used successfully to represent the behavior of pure gases and binary mixtures, was applied to a ternary mixture. An estimate for the ternary third virial coefficient, C{sub 123}, was added to the model. Three experimentally determined binary interaction parameters were also used. The model has been applied to the ternary mixture CH{sub 2}F{sub 2} + CF{sub 3}CHF{sub 2} + CF{sub 3}CH{sub 2}F (R32 + R125 + R134a). The results are useful for calculating gas-phase densities, thermodynamic properties, and fugacities for phase equilibrium calculations. The use of such models leads to a considerable economy of effort in the case of multicomponent mixtures. Examples of the thermodynamic properties are given for the equimolar ternary mixture in the range from the dew-point temperature to 400 K at pressures of 0.5, 1, and 2 MPa. Calculated densities and speeds of sound are compared with new experimental values for a near-equimolar composition.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 669892
- Journal Information:
- International Journal of Thermophysics, Vol. 18, Issue 1; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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