Development of a new model for biodiesel viscosity prediction based on the principle of corresponding state

A new model for predicting the viscosities of biodiesel is presented in this work. This model is based on the principle of corresponding states, using one- and two-reference fluids. For the critical constants of methyl esters, the Marrero–Gani method was used. For biodiesels, Lee–Kesler’s mixing rules were used for critical constants calculations. The two models studied in this work were compared with Ceriani et al. [5], Yuan [6], and Revised Yuan [7] models. A set of data on biodiesel viscosity was used in this work, consisting of 31 pure biodiesels and 4 mixtures of biodiesel (totalizing 193 experimental data). The best result was found using a two-reference-fluids model, methyl laurate (C12:0) and methyl oleate (C18:1), with a global average relative deviation of 6.66%.