A thermodynamic perturbation theory for multicomponent and polydisperse mixtures.
- Resource Type
- Article
- Authors
- Kincaid, John M.; MacDonald, Rosemary A.; Morrison, Graham
- Source
- Journal of Chemical Physics. 11/1/1987, Vol. 87 Issue 9, p5425. 12p.
- Subject
- *PERTURBATION theory
*EQUILIBRIUM
- Language
- ISSN
- 0021-9606
We describe a general perturbation method that can be used to solve the equilibrium and critical-point conditions for model systems described by an analytic Helmholtz free energy. The general technique is developed within the framework of continuous or polydisperse systems; it may be applied to systems with discrete components, as well as to systems described by a continuous distribution of components. The expansion is based on the assumption that the microscopic parameters characterizing the system may be expressed as those of a reference system plus a series of ‘‘small’’ corrections. Explicit formulas for the first- and second-order solutions to the equilibrium and critical-point conditions are given. The low-order perturbation solutions will be useful when the phase boundaries of the system are close to those of the reference system. [ABSTRACT FROM AUTHOR]