A New General Correlation for the Influence Parameter in Density Gradient Theory and Peng-Robinson Equation of State for <i>n</i>-Alkanes.

ABSTRACT: The Density Gradient Theory (DGT) permits obtaining the surface tension by using an equation of state and the so-called influence parameter. Different correlations of the influence parameter versus temperature have been proposed, with the two-coefficient ones from Zuo and Stenby (full temperature range) and Miqueu et al. (valid for the lower temperature range) being widely used. Recently, Cachadiña et al. applied the DGT with the Peng-Robinson Equation of State to esters. They proposed a new two-coefficient correlation that uses a universal exponent related to the critical exponent associated with the dependence of coexistence densities on temperature near the critical point. When applied to n-alkanes, it is shown that the Cachadiña et al. correlation must be modified to improve the

SUBMITTER: Cachadina I 

PROVIDER: S-EPMC11643655 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature