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Gas separation of a binary gaseous mixture is one of characteristic phenomenain the micro-scale flows that differ from the conventional size flows. In thiswork, the separation in a binary gas mixture flows through a microchannel isinvestigated by the lattice Boltzmann method with a diffuse-bounce-back (DBB)boundary condition. The separation degree and rate are measured in the He--Arand Ne--Ar systems for different mole fractions, pressure ratios, and Knudsennumbers. The results show that the separation phenomenon in the He--Ar mixtureis more obvious than that in the Ne--Ar mixture at the same mole fraction owingto the larger molecular mass ratio. In addition, the increase in the pressureratio reduces the difference in the molecular velocities between the twospecies, and the separation phenomenon becomes weaker. However, the gasseparation is enhanced with an increase in the Knudsen number. This is becausethe resulting rarefaction effect reduces the interactions between the gasmolecules of the two species, and thus increases the difference in themolecular velocity.

Lattice Boltzmann simulation of separation phenomenon in a binary gaseous flow through a microchannel