Abstract
In this work, a numerical model based on an algebraic Volume-of-Fluid (VOF) method and the Continuous Species Transfer (CST) model is presented to simulate the heating and evaporation of droplets composed of highly non-ideal mixtures. Regarding this, a non-ideal vapor-liquid equilibrium (VLE) model is coupled to the CST model to properly describe the concentration jump at the droplet’s interface. In addition, since in the CST model the transported variable is a mixture concentration, the values of concentration within the continuous and disperse phases, which are necessary for the evaluation of activity and fugacity coefficients in the VLE calculation, are unknown. Thus, a numerical procedure is proposed to estimate the concentrations in each phase from the mixture concentration. The UNIFAC method is used for activity coefficients calculation. The results for the evaporation of ethanol/iso-octane droplets with different mixture compositions in a 3D domain show good agreement when compared with analytical solutions.
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