EFFECT OF INTERNAL DIFFUSIONAL RESISTANCE ON THE EVAPORATION OF BINARY DROPLETS

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Abstract
An analysis of binary droplet evaporation is made wherein finite difference solutions are obtained to the equations governing unsteady conduction and diffusion within the droplet coupled to a quasi-steady model of mass and energy transport in the gas phase. Results are presented for pentane-, hexane-, and heptane-octane drops evaporating into air at 1 atm. and 600-2300 K. Evaporant composition and evaporation rates are compared with batch distillation behavior and significant differences noted. The phenomenon of disruptive boiling is explained by demonstrating the presence of composition-induced equilibrium pressure excesses of up to 2.25 atm. for pentane-octane drops.

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