The role of preferential vaporization in Fast Pyrolysis Bio Oil (FPBO) droplets evaporation

In this work, the evaporation process of a Fast Pyrolysis Bio Oil (FPBO) droplet is analyzed from a numerical point of view. The droplet is suspended on a thin thermocouple against gravity and evaporated in buoyancy driven convection, replicating the experimental works performed at CNR of Naples. The surrogate composition of FPBO includes nine components and it has been developed within the Residue2Heat project. The numerical modeling is performed with the DropletSMOKE++ code, a comprehensive CFD framework for the simulation of 3D evaporating droplets under gravity conditions. The diameter decay, liquid temperature and species mass fractions in the liquid phase are presented and discussed. The numerical results clearly show the presence of preferential vaporization in the mixture, following a multi-stage evaporation process due to the strong internal convection in the liquid.