Abstract
The problem of evaporation/condensation on planar surfaces in the presence of nanoparticles in bulk vapor, with the particles being uniformly distributed in the space, has been solved by direct numerical solution of the Boltzmann kinetic equation. It has been suggested that droplets are formed on the particles and grow with time due to vapor condensation. The problem has been solved with the use of an original procedure of transforming the function of distribution of vapor molecules, with the transformation being caused by the interaction of the molecules with the particles. The condensation sites present in the vapor have been shown to significantly influence its macroscopic parameters. In particular, the condensation on the nanoparticles significantly reduces the mass flux transmitted from one surface to another. The results of the numerical solution confirm the possibility of calculating the growth rate of the droplets in the free-molecular regime by the Hertz–Knudsen formula.
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