Widom-Rowlinson model

Simulation snapshot of phase separation in two-dimensions.

The Widom-Rowlinson model (Ref. 1) 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 been studied by:

• E. de Miguel, N. G. Almarza and G. Jackson "Surface tension of the Widom-Rowlinson model", Journal of Chemical Physics 127 034707 (2007)
• Yuri Djikaev "The interfacial tension and phase diagram of the Widom-Rowlinson mixture via Monte Carlo simulations", Journal of Chemical Physics 128 014712 (2008)

References

1. B. Widom and J. S. Rowlinson, "New Model for the Study of Liquid–Vapor Phase Transitions", J. Chem. Phys. 52, pp. 1670-1684 (1970)