False (artificial) diffusion provides an erroneous estimation of molecular diffusion during the simulation of liquid micromixing. The present review introduces discretization methods, numerical grid types, and numerical errors to address the effect of false diffusion on the prediction of mixing efficiency of microfluidic devices. False diffusivity is characterized by the grid Peclet number, grid type, and discretization scheme. This review demonstrates that most investigators have selected a grid resolution just for the grid independence test. It is revealed that the convergence criterion should not be quantitative values of mixing efficiency even when high-order schemes are employed to discretize the computational grid. Based on the previous publications in this field, a straightforward procedure is recommended to manage false diffusion in the numerical simulation of micromixers.

错误的（人为）扩散在模拟液体微混合过程中提供了分子扩散的错误估计。本综述介绍了离散化方法，数值网格类型和数值误差，以解决错误扩散对微流体装置混合效率预测的影响。错误扩散率的特征在于网格Peclet数，网格类型和离散化方案。这项审查表明，大多数研究人员仅为网格独立性测试选择了网格分辨率。结果表明，即使采用高阶方案离散化计算网格，收敛准则也不应该是混合效率的定量值。根据该领域以前的出版物，