Artificial diffusion in the simulation of micromixers: A review

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 effi...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part C, Journal of mechanical engineering science Journal of mechanical engineering science, 2021-11, Vol.235 (21), p.5288-5296
Main Author: Bayareh, Morteza
Format: Article
Language:English
Subjects:
Computational grids
Diffusion effects
Discretization
False diffusion
Microfluidic devices
Micromixing
Molecular diffusion
Numerical methods
Peclet number
Simulation
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Summary: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.
ISSN:0954-4062
2041-2983
DOI:10.1177/0954406220982028