Evaporation Rates and Lifetimes of Clouds and Sprays in Air. III. The Effects of Cloud Expansion

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Abstract
A simple method is given for determining theoretically the effects of cloud expansion upon the rate of evaporation of droplets in assemblages. The expansion of clouds is examined in terms of the Brownian motion, electric charge, and turbulent diffusion and dispersion. Results obtained by using both the cellular and the continuum models for cloud evaporation show that the Brownian diffusion slightly speeds up the evaporation rates and the electric charge has only a negligible effect, but the turbulent diffusion with a relative turbulent velocity of 1 cm/sec can shorten the lifetimes of a cloud by several hundred times.