Model for Evaporation of Droplets of Ideal Al¬cohol Solutions in Diffusive and Transient Regimes
Keywords:alcohols, solutions, evaporation regime
The development of models describing the process of evaporation of droplets of various solutions – in particular, alcohol ones – is a difficult task in the general case; namely, it is necessary to solve a system of coupled mass and heat transfer equations. An alternative approach consists in creating a simplified model making allowance for those physical mechanisms that are essential under specific evaporation conditions. On the basis of this approach and in the framework of the Maxwell–Fuchs evaporation theory, a model has been proposed to describe the evaporation process of ideal binary solutions in the diffusive and transient regimes. In order to verify the model, experimental studies were carried out dealing with the evaporation of droplets of binary alcohol solutions (propanol-octanol and butanol-octanol, with initial octanol mole fractions of 0.25, 0.5, and 0.75) in the dry nitrogen atmosphere at a temperature of 293 K in the diffusive and transient regimes. The proposed model was used to calculate the time dependences of the droplet surface area for the researched binary alcohol solutions. The obtained model curves are compared with experimental data. It is shown that, within the validity limits of its approximations, the model can be used to describe the evaporation process both in the diffusive and transient regimes.
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