N. N. Zastenker

Kinetic description of the expansion of a supersonic pulsed jet to vacuum: II. Mixtures of monoatomic gases

A model for the expansion of a pulsed jet of a mixture of monoatomic gases was advanced on the basis of the Boltzmann kinetic equation. The Grad method was used to solve the Boltzmann equation. The set of moment equations was analyzed by matching asymptotic expansions. The behavior of the velocity slip and temperature difference was analyzed as a function of the conditions in the source and the component-gas concentrations in the mixture. A functional relationship between these quantities and the form of the interaction potential has been established.

Nonequilibrium effects in a steady supersonic jet of a mixture of monatomic gases

On the basis of the moment equation system for parameters of a steady supersonic jet of a mixture of monatomic gases, the analysis of nonequilibrium effects as a velocity slip and temperature difference of components was carried out in hypersonic and spherically symmetric approximations. The limiting values of velocity slips and kinetic temperatures of mixture components depending on the source jet conditions and interaction potential were obtained.

Equations for translational relaxation in a steady supersonic jet of a mixture of monoatomic gases

On the basis of the Boltzmann kinetic equation with the use of the ellipsoidal distribution function a system of equations that takes the two-dimensional flow near a nozzle into account was derived for the parameters of a supersonic steady jet expanding into a vacuum.

Kinetic description of the expansion of a supersonic pulsed jet into a vacuum: III. Determination of the parameters of the atomic interaction potential at low temperatures

A new method based on the kinetic description of a supersonic pulsed jet is proposed for the determination of the parameters of the atomic interaction potential. Analytical relationships are established between the peak position of the observed time-of-flight spectrum, on the one hand, and the source conditions and interaction potential parameters, on the other.