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The paper presents some results of computing of a gas mixture flows in Knudsen pumps. The simulations are carried out by numerically solving the Boltzmann kinetic equation by the conservative projection method. Interactions of gas molecule are modeled by Lennard-Jones and the newest ab initio potentials. The values of the pumping rate, gas mixture separation, and the graphics of gas flow parameters inside the pumps are given. The results obtained with different molecular models are compared and the influence of the molecular potentials on macroscopic flow parameters is shown. The simulations are performed in plane and 3D geometries.

The paper presents some results of computing gas mixture flows in Knudsen and Holweck pumps. Transient flow development processes and attainment of the steady state are considered. The calculations were performed using a problem solving environment developed by the authors. A conservative projection method of solving the Boltzmann kinetic equation upon which the problem solving environment is based is described. The paper is aimed to demonstrate the capabilities of the software at the actual stage of its development.