Wong–Sandler mixing rule

The Wong–Sandler mixing rule is a thermodynamic mixing rule used for vapor–liquid equilibrium and liquid-liquid equilibrium calculations. __TOC__

Summary

The first boundary condition is

which constrains the sum of a and b. The second equation is

with the notable limit as (and ) of

The mixing rules become

The cross term still must be specified by a combining rule, either

or

See also Vapor–liquid equilibrium Equation of state

References