Diffusional Processes in the Growth of Aerosol Particles. II

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Abstract
The effect of the moving boundary of the growing aerosol particle upon the diffusional processes previously investigated for the special case of sinks with stationary boundaries is now discussed in detail. The zeroth‐order approximation for the flux rate, valid for aerosol and most colloid systems, is found to be of the same analytic form as that for the stationary boundary case. A growth equation is derived for particles growing in the presence of a plurality of competing sinks which deplete the supersaturation. The growth equation here derived is found to be in satisfactory agreement with experiment in the case of barium sulfate crystals growing in aqueous solution. It is further shown that self‐nucleated sols tend to monodispersity with growth. The effects of additional molecules becoming available for diffusion and of variability of the absorption probability are also discussed and evaluated for the special case of a single particle in the diffusion field.

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