Hydrodynamic anomalies in supercritical fluid

الأصل · EN

Using the molecular dynamics simulations we investigate properties of velocity autocorrelation function of Lennard-Jones fluid at long and intermediate time scales in wide ranges of temperature and density. We show that the amplitudes of the leading and subleading VAF time asymptotes, a₁ and a₂, show essentially non monotonous temperature and density dependence. There are two lines on temperature-density plain corresponding to maxima of a₁ (a₂) along isochors and isotherms situated in the supercritical fluid (hydrodynamic anomalies). These lines give insight into the stages of the fluid evolution into gas.