Nature of vapor-liquid asymmetry in fluid criticality

Jingtao Wang, Mikhail A. Anisimov
2007 Physical Review E  
We have investigated the nature and experimental consequences of vapor-liquid asymmetry in near-critical fluids within the framework of "complete scaling" ͓M. E. Fisher and G. Orkoulas, Phys. Rev. Lett. 85, 696 ͑2000͒; Y. C. Kim et al., Phys. Rev. E 67, 061506 ͑2003͔͒. We used the thermodynamic freedom for a choice of the critical-entropy value to simplify "complete scaling" to a form with only two independent parameters, responsible for two different sources of the asymmetry. We then developed
more » ... . We then developed a procedure to obtain these two parameters from mean-field equations of state. By combining accurate liquid-vapor coexistence and heatcapacity data, we have unambiguously separated two nonanalytic contributions from the two sources of vaporliquid asymmetry and proved the validity of "complete scaling." Since the nonanalytic asymmetry effects in the critical region are fully determined by the Ising critical exponents for the symmetric lattice-gas model, there is no need for a special renormalization-group theoretical treatment of "non-Ising" asymmetry in fluid criticality.
doi:10.1103/physreve.75.051107 pmid:17677022 fatcat:iacnrij5oncefcfitbibsrwqle