Abstract

Rosen's restricted variational principle representation of the Boltzmann equation is used to determine the free-molecular mixing of two initially parallel streams of differing temperature and speed ratio. Mixing is accomplished by means of thermal and convective motions of the gas particles. It is shown that the variational method leads to a rapid calculation scheme for number density and velocity; the results of the method compare closely to the exact special function solutions of the collisionless Boltzmann equation.

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