Widom-Rowlinson model

Simulation snapshot of phase separation in two-dimensions.

The Widom-Rowlinson model for mixtures takes the form:

$\mathrm{\Phi }(r_{ij})=0$; if $i$ and $j$ are particles of the same species

$\mathrm{\Phi }(r_{ij})={\mathrm{\Phi }}_{HS}(r_{ij});$ if $i$ and $j$ belong to different species,

where ${\mathrm{\Phi }}_{HS}(r)$ is the hard sphere intermolecular pair potential.

Surface tension

The surface tension of the Widom-Rowlinson model has also been studied

References

Related reading

• T. W. Melnyk, J. S. Rowlinson and B. L. Sawford "The penetrable sphere and related models of liquid—vapour equilibrium" Molecular Physics 24 pp. 809-831 (1972)