Scale equations for the coexistence curve, the capillary constant and the surface tension of n-alkanes
GARRABOS, Yves
ESEME : Équipe du Supercritique pour l'Environnement, les Matériaux et l'Espace : Équipe commune CEA-CNRS (2000-2014)
ESEME : Équipe du Supercritique pour l'Environnement, les Matériaux et l'Espace : Équipe commune CEA-CNRS (2000-2014)
GARRABOS, Yves
ESEME : Équipe du Supercritique pour l'Environnement, les Matériaux et l'Espace : Équipe commune CEA-CNRS (2000-2014)
< Réduire
ESEME : Équipe du Supercritique pour l'Environnement, les Matériaux et l'Espace : Équipe commune CEA-CNRS (2000-2014)
Langue
en
Article de revue
Ce document a été publié dans
Fluid Phase Equilibria. 2002, vol. 198, n° 2, p. 165-183
Elsevier
Résumé en anglais
A review of experimental data of several fluids shows that their coexistencecurve follows a power law in reduced temperature at the approach of the critical point, with an universal exponent equal to 0.325, their ...Lire la suite >
A review of experimental data of several fluids shows that their coexistencecurve follows a power law in reduced temperature at the approach of the critical point, with an universal exponent equal to 0.325, their capillaryconstant a power law with an universal exponent equal to 0.925 and their surfacetension a power law with an universal exponent equal to 1.26. In the critical region, the concept of two-scale-factor universality was used to predict the density difference amplitude, the capillaryconstant amplitude, and the surfacetension amplitude between near critical vapor and liquid phases. A comparison with amplitudes determined from experimental data is given. In order to extend this universality all along the liquid-gas coexistencecurve from the triple point to the critical point for n-alkanes, a mean field approximation was used far away from TC. We show that the density difference, the capillaryconstant and the surfacetension can be calculated with a reasonable accuracy by generalized scaled equations adding only two empirical constants. A comparison between calculated and experimental data is presented.< Réduire
Mots clés en anglais
Alkanes
Capillary constant
Coexistense curve
Critical point
Scaling laws
Surface tension
Origine
Importé de halUnités de recherche