Discrete Velocity Numerical Approach to Strong Evaporation of Graphite
RUSSIAN ACADEMY OF SCIENCES MOSCOW (RUSSIA) BAIKOV INST OF METALLURGY AND MATERIAL SCIENCE
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Carbon vapor formed at graphite evaporation contains considerable amounts of molecules C2 and C3 along with single atoms C. A numerical kinetic approach to gas mixtures is proposed which is based on a relaxation model for the Boltzmann equation. It is found that relations between the pressure and temperature ratios and the Mach number behind the Knudsen layer do not depend on vapor composition and are the same as in one-component vapor. The molecular composition of vapor is determined by decreasing the thermal velocity with molecular mass that decreases evaporation rate of heavier species and by decreasing the recondensation fraction with molecular mass that acts oppositely.
- Physical Chemistry
- Numerical Mathematics
- Fluid Mechanics