Correlation for viscosities of pure liquids at high pressures

Abstract

Abstract An accurate model for the viscosities of nonpolar and polar liquids at high pressure based on the Eyring's absolute rate theory and the equation of state has been proposed by Martins et al. in 2003. One characteristic of this model is requiring two adjustable parameters at each temperature, which limits its application. In this work, we modified their model by establishing correlations between the adjustable parameters and temperature to improve its predictive potential. The present model coupled with Soave-Redlich-Kwong equation of state was applied to correlate the viscosities of 30 compounds including alkanes, alkenes, aromatics, alcohols, oxygen, argon and nitrogen at temperatures from 65 K to 460 K and pressures from 0.1 MPa to 253.1 MPa. The calculated values from the present model agree well with the experimental data in all cases, with the average absolute relative deviations lower than 3.7%.