The geometric layout is the key factor for enhancing the efficiency of the fluid mixing in passive micromixers. Therefore, by adjusting\nthe geometric design and by controlling the geometric parameters, one can enhance the mixing process. However, through any\nfabrication process, the geometric parameters present slight, inherent variation from the designed values than might affect the\nperformance of the micromixer.This paper proposes a numerical study on the influence of the unavoidable geometric tolerances\non the mixing efficiency in passive micromixers. A probabilistic simulation model, based on the Monte Carlo method, is developed\nand implemented for this purpose. An uncertainty simulation model shows that significant deviations from the deterministic design\ncan appear due to small variations in the geometric parameters values and demonstrates how a more realistic mixing performance\ncan be estimated.
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