On the Singularity of the Liquid-Gas Coexistence Curve Diameter


  • O. Bakai National Science Center Kharkiv Institute of Physics and Technology, Nat. Acad. of Sci. of Ukraine
  • M. Bratchenko National Science Center Kharkiv Institute of Physics and Technology, Nat. Acad. of Sci. of Ukraine
  • S. Dyuldya National Science Center Kharkiv Institute of Physics and Technology, Nat. Acad. of Sci. of Ukraine




gas-liquid coexistence curve, diameter singularity, heterophase fluctuations, mesoscopic model, heterophase fluid, mesoscopic asymmetry parameters


A simplified Anisimov–Wang variant of the complete scaling approach makes it possible to determine the amplitudes of singularities for the diameter of the phase coexistence curve (CXC) on the basis of the coefficients in the power series expansion of the mean-field free energy in the reduced temperature and pressure near the critical point. This method is applied to obtain the amplitudes for the leading critical singularities of the CXC diameter in the case of a fluid described in the framework of the mesoscopic mean-field model. The results obtained demonstrate that the amplitudes of leading singularities of the CXC diameter are determined by the mesoscopic asymmetry parameters of the heterophase fluid.


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How to Cite

Bakai, O., Bratchenko, M., & Dyuldya, S. (2020). On the Singularity of the Liquid-Gas Coexistence Curve Diameter. Ukrainian Journal of Physics, 65(9), 802. https://doi.org/10.15407/ujpe65.9.802



Physics of liquids and liquid systems, biophysics and medical physics