Practical expressions for the internal energy and pressure of Yukawa fluids

Simple practical expressions that allow estimation of thermodynamic properties of Yukawa fluids in a wide range of coupling, up to the fluid-solid phase transition, are presented. These expressions demonstrate excellent agreement with the available results from numerical simulations. The approach provides simple and accurate tools to estimate thermodynamic properties of Yukawa fluids and related systems in a broad range of parameters.

Figure 1

Thermal component of the reduced excess energy of Yukawa fluids versus the reduced coupling parameter $\Gamma /{\Gamma }_{\mathrm{m}}$. Symbols correspond to the numerical simulations for different values of the screening parameter $\kappa$ [9, 22]. The (red) solid curve is the fit of Eq. (4) with $\delta =3.2$ and $\epsilon =-0.1$. The (black) dashed line corresponds to the same functional form, but with $\delta =3.0$ and $\epsilon =0$, as suggested in Ref. [21].