WEAK EVAPORATION (CONDENSATION) WITH AN ARBITRARY 
EVAPORATION COEFFICIENT IN GASES WITH A CONSTANT FREQUENCY 
OF MOLECULAR OLLISIONS

A. V. Latyshev and A. A. Yushkanov

UDC 533.72

We have obtained an exact solution of the problem 
on determination of temperature and concentration jumps of a rarefied 
elementary (monoatomic) gas in the case of weak evaporation from the 
gas-condensed phase interface into the half-space of a saturated 
vapor. Use is made of a model kinetic equation with a collision integral 
in the BGK (Bhatnagar, Gross, and Krook) form. Accurate coefficients 
of the temperature and concentration jumps are found. It is shown 
that at low evaporation coefficients the dependence of the concentration 
of the vapor on its evaporation (concentration) rate at a large distance 
from the interface is linear even at low (as compared to sonic) vapor 
velocities.

JEPTER7492020002
JEPTER749202