A Corresponding States Approach Based On Molecular Theory For Modeling Transport Properties Of Supercritical Fluids

M. S. ZABALOY; V. R. VASQUEZ; E. A. MACEDO

Florianópolis – SC – Brasil

Congreso; V EBFS - V Encontro Brasileiro de Fluidos Supercríticos - 21 a 23 de Abril de 2004; 2004

UFSC, UEM, PUC/RS, URI/Erechim

In this work, we propose a model for representing the viscosity of supercritical pure fluids in wide ranges of conditions. A given pure real fluid is represented as a Lennard-Jones (LJ) fluid having efective values of the LJ intermolecular potential parameters. The LJ fluid is actually a corresponding states fluid where the dimensionless variables have, as a distinguishing feature, a dependency on parameters meaningful at molecular level. The model is able to represent the pure compound viscosity of real supercritical fluids in wide ranges of conditions with average absolute-value relative deviations less than or equal to 7 % in most cases. Key words: viscosity, supercritical real fluids, model, molecular simulation