Correlation of viscosities for biofuels mixtures

Correlation represents the relation between the variation of viscosity (η) of pure and binary chemical systems of 1-alcohols and n-alkanes with temperature and pressure, number of carbon atoms and variable concentrations. Representative gasoline hydrocarbons: iso-octane gasoline, cyclohexane, 1-hexene and pseudocumene, and alcohols: 1-butanol and 2-butanol, were used in this study. Binary mixtures were: 1-hexene + 1-butanol, cyclohexane + 1-butanol, iso-octane + 1-butanol, iso-octane + 2-butanol, pseudocumene + 1-butanol, and pseudocumene + 2-butanol. Experimental data of viscosity η were correlated with Vogel-Fulcher-Tammann equation (VFT), combined with Tait's equation. Prediction was performed using the Dymond-Assael rigid spheres model (RHS), with a modification to the model and with Eyring Theory supported by mixing laws.

Keywords: biofuels, correlation, dynamic viscosity, mixtures.