Particle size and phase equilibria in classical logarithmic fluid

Abstract An interparticle interaction potential has been recently proposed in studies of condensate-like systems described by logarithmically nonlinear equations, such as the superfluid helium-4 and Korteweg-type melts. It shape a Gaussian multiplied linear function can switch between attraction repulsion regimes distance varies. We consider classical fluid model with discretized version this Monte Carlo molecular simulations Gibbs ensemble. demonstrate two-phase system consisting dense “liquid” phase coexistence significantly less “vapour” phase. For computations, particle size term was varied to determine its effect on both envelope critical point system. is found that logarithm dimensionless temperature decreases sigmoid fashion increasing size, while density may be directly proportional size.