Comparative evaluation of microfluidic circuit model performance for electroviscous flow

Christian John Charles Biscombe, Malcolm Roderick Davidson, Dalton James Eric Harvie


Microfluidic circuit models are useful tools for conceptualising and designing lab-on-chip devices. We evaluate the ability of two different microfluidic circuit models to accurately predict electroviscous (pressure driven) flow behaviour in a particular contraction-expansion geometry over an experimentally relevant range of inlet concentrations and surface charge densities. We show that a linear `total current model' based on a relatively simple ion species constraint at circuit nodes performs well compared to a non-linear `ion current model' that conserves species exactly. Specifically, the total current model over-predicts the total pressure and potential differences by less than 2% and 7% respectively for silica channels.

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microfluidic; electroviscous; contraction-expansion; modelling; electrokinetic

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