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 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)