Abstract

A model of water cluster formation based on kinetic approach is developed. Equations for the probabilities of elementary processes of cluster growth and decay are suggested. Parameters for those probabilities are proposed to be determined from the data on the macroscopic rate constants of corresponding reactions. DSMC simulations of water vapor expansion into vacuum taking into account water cluster nucleation in the range of parameters corresponding to transient outflow regime are carried out. The simulation results are in agreement with the experimental data on terminal dimer mole fraction.

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