Vapour/liquid coexistence in long-range Yukawa fluids determined by means of an augmented van der Waals approach

Abstract

The vapour–liquid phase diagram of long-range Yukawa fluids with the decay parameter zσ ≤ 1 is calculated by means of an augmented van der Waals theory based on the reference system that includes both the repulsive and short-range attractive interaction. Comparison with Monte Carlo simulation data, as well as with the traditional van der Waals approach based on a purely repulsive hard-sphere reference system and other semi-analytical theoretical approaches, is made.

Keywords:

• Yukawa fluid
• perturbation theory
• augmented van der Waals approach
• vapour–liquid coexistence

Acknowledgements

This work was supported by the Grant Agency of the Academy of Sciences of the Czech Republic (Grant No. IAA400720710) and Czech–Ukrainian Bilateral Cooperative Program.