Microscopic effects and kinetics of binary nucleation beyond the confines of the Fokker-Planck approximation

Djikaev, Y. S.; Grinin, A. P.; Kuni, F. M.
August 2000
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p131
Academic Journal
The kinetic equation of isothermal binary nucleation is derived from the discrete equation of balance. It is shown that under some circumstances the Fokker-Planck approximation in the kinetic equation is not applicable. For such a case, we establish the hierarchy of the time scales of binary nucleation. This hierarchy allows one to separate and analytically describe the stage of concentration relaxation of binary nucleation during which the distribution of nuclei with respect to the concentration of solution in them approaches the quasi-equilibrium Gaussian distribution. During the subsequent evolution of nuclei the kinetic equation is solved by using the method of Enskog and Chapman, and all the main characteristics of the kinetics of binary nucleation are found. We also study two microscopic effects of nucleation, namely, the effect of fluctuations of the nucleus composition and the effect of material quasi-isolation of a nucleus. It is shown that the contributions of these two effects to the kinetics of binary nucleation compensate.


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