Improved Correlation for Viscosity from Surface Tension Data for Saturated Normal Fluids

TL;DR

This paper introduces a new four-coefficient correlation between viscosity and surface tension for saturated normal fluids, significantly improving accuracy across a wide range of substances.

Contribution

The paper presents a novel four-coefficient correlation that enhances the prediction of viscosity from surface tension data for various saturated normal fluids.

Findings

Achieved absolute average deviations below 1% for 40 substances

Achieved deviations below 2.1% for 10 substances

Applicable to a wide range of fluids including gases, hydrocarbons, and refrigerants

Abstract

Several correlations between viscosity and surface tension for saturated normal fluids have been proposed in the literature. Usually, they include three or four adjustable coefficients for every fluid and give generally good results. In this paper we propose a new and improved four-coefficient correlation which was obtained by fitting data ranging from the triple point to a point very near to the critical one. Fifty four substances were considered, including simple fluids (such as rare gases), simple hydrocarbons, refrigerants, and some other substances such as carbon dioxide, water or ethanol. The new correlation clearly improves the results obtained with those previously available since it gives absolute average deviations below1% for 40 substances and below 2.1% for 10 substances more.