The method of direct numerical solution of the kinetic equation for the droplet size distribution function is presented. This new method which is not restricted by the Knudsen number was developed using the analogy with a similar method of solution of the Boltzmann kinetic equation. The simulation of vapor behavior at fast creation of supersaturation state in vapor-gas mixture by means of adiabatic expansion was carried out for the verification of the method. The results obtained by this method were compared with those which were obtained by using the method of moments over a broad range of Knudsen number. The effect of the interphase heat transfer and dependence between saturation pressure and droplet size on the dynamics of condensation relaxation was studied.

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