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- W2011839061 abstract "In the present paper we propose a van der Waals--like model that allows a purely analytical study of fluid properties including the equation of state, phase behavior, and supercritical fluctuations. We take a square-well system as an example and calculate its liquid-gas transition line and supercritical fluctuations. Employing this model allows us to calculate not only the thermodynamic response functions (isothermal compressibility ${ensuremath{beta}}_{T}$, isobaric heat capacity ${C}_{P}$, density fluctuations ${ensuremath{zeta}}_{T}$, and thermal expansion coefficient ${ensuremath{alpha}}_{T}$), but also the correlation length in the fluid $ensuremath{xi}$. It is shown that the bunch of extrema widens rapidly upon departure from the critical point. It seems that the Widom line defined in this way cannot be considered as a real boundary that divides the supercritical region into gaslike and liquidlike regions. As it has been shown recently, a dynamic line on the phase diagram in the supercritical region, namely, the Frenkel line, can be used for this purpose." @default.
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- W2011839061 date "2014-04-18" @default.
- W2011839061 modified "2023-09-26" @default.
- W2011839061 title "True Widom line for a square-well system" @default.
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- W2011839061 doi "https://doi.org/10.1103/physreve.89.042136" @default.
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