Free jet expansions of binary atomic mixtures: A method of moments solution of the Boltzmann equation

Troy L. Mazely, Gillian H. Roehrig, Mark A. Smith

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The method of moments is used to obtain solutions to the Boltzmann equation describing flow and thermal relaxation of binary atomic mixtures undergoing adiabatic free jet expansion. Differential moment equations are solved within the framework of an anisotropic Maxwellian distribution function. Numerical integration of these equations yields the temporal dependence of the four moments of the distribution function for each flow component; density, hydrodynamic velocity, parallel temperature, and perpendicular temperature. Results are presented for mixtures of the rare gases which yield new insight into the driving forces behind the phenomena of velocity and temperature slip. The model can easily be extended to ternary and higher atomic mixtures.

Original languageEnglish (US)
Pages (from-to)8638-8652
Number of pages15
JournalThe Journal of chemical physics
Volume103
Issue number19
DOIs
StatePublished - 1995

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