A novel vaporisation model for a single-component drop in high temperature air streams

Abstract

A new model for drop evaporation has been developed, including the effect of gas convection according to the film theory, by relating the thermal and diffusional film thicknesses to the gas stream Reynolds number. The model solves the species, momentum and energy conservation equations in a radial coordinate system, accounting explicitly for the gas density dependence on temperature and vapour concentration. The model has been tested under a wide range of gas temperatures, Reynolds numbers and liquid species and the results have been compared against experimental data available in the scientific literature and with the predictions from the classical extended film model. The present model, together with relieving some of the physical inconsistencies of the classical models, which become not negligible at high gas temperature, also shows a rather good agreement with the experimental data for the selected operating conditions.