Yang-Yang Anomalies and Coexistence Diameters: Simulation of Asymmetric Fluids

Abstract

A general method for estimating the Yang-Yang ratio, ${\mathcal{R}}_{\mu }$, and the coexistence-curve diameter of a model fluid via Monte Carlo simulations is presented on the basis of data for a hard-core square-well (HCSW) fluid and the restricted primitive model (RPM) electrolyte. The isothermal minima of $Q_L\equiv <m^2{>}_L^2/<m^4{>}_L$ are evaluated at $T_c$ in an $L\times L\times L$ box where $m=\rho -<\rho {>}_L$ is the density fluctuation. The ``complete'' finite-size scaling theory for the $Q_{min}^{\pm }(T_c;L)$ incorporates pressure mixing in the scaling fields, thereby allowing for a Yang-Yang anomaly.

Submitted for publication in Phys. Rev. E

References in corpus (1)

• Discretization Dependence of Criticality in Model Fluids: a Hard-core Electrolyte

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