The Direct Simulation Monte Carlo (DSMC) method is employed to model and simulate the mixing of two non-reactive gas streams in a simple twodimensional micro-mixer. The efficiency of the mixing process in a mixer is related to the mixing length, which is the distance from the inlet where the mixture is found to be homogeneous. A new method to measure homogeneity is presented. It has been found that the boundary conditions at the walls and the inlets, the molecular models and the physical

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... ies of the gas species may influence the mixing process at different scales. Their level of influence on the efficiency of the mixer is presented.