Abstract
An asymptotic method is proposed for reducing the order of the equations of condensation kinetics not only in the region of gradual droplet growth but also where diffusion in the space of sizes is important. This method makes it possible to extend the class of problems of determining the unsteady nucleation rate that have analytic solutions and to weaken the constraints imposed on the rate of variation of the gas dynamic parameters. Effects associated with the rapid variation of the critical droplet size are investigated. For this purpose the concept of a threshold dimension, in whose neighborhood the clusters go over into the droplet growth regime, is introduced. In the highly nonstationary case the threshold size differs from the critical size. Examples of simple calculations are presented.
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