DOI:10.5488/CMP.21.43502 arXiv:1712.07164
Title:
The equation of state of a cell fluid model in the supercritical region
Author(s):
| M.P. Kozlovskii (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., 79011 Lviv, Ukraine) , | |
| I.V. Pylyuk (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., 79011 Lviv, Ukraine) , | |
| O.A. Dobush (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., 79011 Lviv, Ukraine) |
The analytic method for deriving the equation of state of a cell fluid model in the region above the critical temperature (T ≥ Tc) is elaborated using the renormalization group transformation in the collective variables set. Mathematical description with allowance for non-Gaussian fluctuations of the order parameter is performed in the vicinity of the critical point on the basis of the ρ4 model. The proposed method of calculation of the grand partition function allows one to obtain the equation for the critical temperature of the fluid model in addition to universal quantities such as critical exponents of the correlation length. The isothermal compressibility is plotted as a function of density. The line of extrema of the compressibility in the supercritical region is also represented.
Key words:
cell fluid model, critical exponent, equation of state, supercritical region
PACS:
51.30.+i, 64.60.fd
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