1 research outputs found
Morse fluids in the immediate vicinity of the critical point: Calculation of thermodynamic coefficients
The previously proposed approach for the microscopic description of the
critical behavior of Morse liquids based on the cell fluid model is applied to
the case where the parameters of the Morse interaction potential correspond to
alkali metals (sodium and potassium). The critical temperatures, densities, and
pressures obtained for sodium and potassium agree with the experimental
results. The thermodynamic coefficients (isothermal compressibility, density
fluctuations, and thermal expansion) of sodium are investigated in the
supercritical temperature region. Numerical calculations of thermodynamic
coefficients are performed close to the critical point, where carrying out
theoretical and experimental research is challenging. The change in
compressibility with increasing density at various temperature values is
traced. The behavior of density fluctuations approaching the critical point is
shown for different temperatures. The variation in the magnitude of the thermal
expansion with increasing temperature for different pressure values is
illustrated.Comment: 14 pages, 6 figures, 1 tabl