A. P. Kryukov

Analysis of intensive evaporation and condensation

Abstract Applying the principles of the molecular-kinetic theory, the basic relationships are studied which govern the processes of intensive evaporation and condensation. One-dimensional steady-state problems are considered. Through application of an approximate method, developed by the authors, a closed description of the processes of intensive evaporation and condensation is obtained. The calculation data are presented which characterize the basic regularities in the above processes. These are compared with the experimental data of Necmi and Rose [23] on intensive condensation of mercury. Based on the results obtained, simple interpolation formulae are suggested. The findings of the analysis check well with the known numerical solutions of the problems of intensive evaporation and condensation. In the region of low-intensity processes, the proposed formulae go over into the known linear theory relations.

Vapor Flow with Evaporation–Condensation on Solid Particles

Strongly nonequilibrium vapor (gas) flows in a region filled by solid particles are considered with allowance for particle‐size variation due to evaporation–condensation on the particle surface. The study is performed by directly solving the kinetic Boltzmann equation with allowance for the transformation of the distribution function of gas molecules due to their interaction with dust particles.

Investigation of Flows of a Gas–Dust Mixture by the Methods of Molecular-Kinetic Theory

Using a direct numerical solution of the Boltzmann kinetic equation the problem of the flow of a gas–dust mixture is investigated with allowance for the motion of the dust. The qualitative analysis made has shown that in describing the flow of gas–dust mixtures it becomes possible to simplify the system of kinetic equations. The dependences of the density, the temperature, and the velocity of the gas on the coordinate have been obtained for different concentrations and velocities of the dust particles.

Analysis of the flow of rarefied gas through a layer of a porous body on the basis of direct numerical solution of the kinetic Boltzmann equation

The problem of the flow of rarefied gas through a layer of a porous body, which is replaced by a homogeneous system of immobile spherical particles, is solved on the basis of the method of direct numerical solution of the kinetic Boltzmann equation. The effect of the spherical particles on the gas molecules is described as a kind of “boundary condition” distributed in space. Dependences of the density, temperature, and velocity on the coordinate in physical space are obtained; cross sections of the distribution function of the gas molecules by velocities are presented.