Abstract
The steady-state nucleation kinetics is analyzed in the case of condensation of a binary liquid from the vapor phase. A two-dimensional equation for the distribution function of clusters is transformed system of equations relating different moments of this function. The derived expression for the rate of nucleation is a function of the mean composition of clusters of size n, 〈 C( n)〉. An approximate self-consistent equation for 〈 C( n)〉 is written. This equation is solved numerically, and the results are compared with a numerical solution of the initial two-dimensional equation. It is shown that the position of the point of maximum resistance to nucleation, n m , is determined not only by thermodynamic characteristics of the system but also by a kinetic parameter r which is proportional to P 0 B/ P 0 A, where P 0 i is the saturation pressure over the pure liquid i. An increase in r(for r> 1) or in 1/ r (for r⩽1) results in an increased departure of n m from the size n ∗ of the critical nucleus. If the vapor is supersaturated with respect to component A, a decrease in r tending to zero is accompanied by a gradual transition from the nucleation of the binary solution to the nucleation of the pure liquid A.
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