predicting the viscosity of hydrocarbon mixtures by means of the peng robinson equation of state

In order to determine the viscosity of liquid and gas chlorofluorocarbons, there are various experimental relationships and graphs, but the utilization of these relationships and charts has been limited. in this work, the viscosities of hydrocarbon mixtures have been developed by applying a reliable model based on the peng-robinson cubic equation of state and mixing rule is used for hydrocarbon mixtures. finally, the fminsearch algorithm is used to optimize the result of 80 data points for binary mixtures. the results show the similarity between the experimental data and the model results. for four two-component hydrocarbon mixtures average relative error is 5.28 %. in conclusion, this model is so accurate and does not require the property of density, which is the main advantages.