Lasich M, Particle size and phase equilibria in classical.pdf (691.22 kB)
Particle size and phase equilibria in classical logarithmic fluid
journal contribution
posted on 2022-01-26, 09:03 authored by M. Lasich, K. G. ZloshchastievAn 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 has the shape of a Gaussian multiplied by a linear
function and can switch between the attraction and repulsion regimes as the distance varies.
We consider a classical fluid model with a discretized version of this potential in Monte Carlo
molecular simulations in the Gibbs ensemble. We demonstrate a two-phase system consisting
of a dense “liquid” phase in coexistence with a significantly less dense “vapour” phase. For
computations, the particle size term in the potential was varied to determine its effect on both
the phase envelope and the critical point of the system. It is found that the logarithm of the
dimensionless critical temperature decreases in a sigmoid fashion with increasing particle size,
while the critical density may be directly proportional to the particle size.