Abstract
Diffusion-controlled evaporation or growth of submicroscopic particles is considered theoretically and experimentally. The conditions for which Fick's law apply are elucidated for Knudsen aerosols, and Fick's law together with the Chapman-Enskog molecular theory of gases are applied to determine diffusivities and Lennard-Jones intermolecular force parameters from experimental data on single submicron aerosol evaporation. The experimental method involving light scattering from a single droplet suspended in an electric field is reviewed, and the results for diffusion-controlled and noncontinuum evaporation are presented. For Knudsen numbers greater than 0.05, where diffusion theory does not apply, evaporation rate data are compared with available theoretical and semi-theoretical equations. A recently published solution of the stationary Boltzmann equation, modified to include the collision integral, is shown to be in excellent agreement with our experimental data for dibutyl sebacate evaporating into nitrogen.
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