On the effect of surfactant adsorption and viscosity change on apparent slip in hydrophobic microchannels
by Christian Kunert, Jens Harting
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 8, No. 1/2/3/4, 2008

Abstract: Substantial effort has been invested to understand the effect of boundary slippage in microfluidics. However, a satisfactory understanding is still lacking due to extremely precise experiments required. Here, we apply the lattice Boltzmann method to model hydrophobic microchannel flows. We find a possible explanation for experiments observing slip depending on the flow velocity – in contradiction to previous studies. We show that these observations can be explained by not fully developed flow profiles in the channel. Further, we show a decreasing slip length with increasing viscosity and demonstrate the effect of adding surfactant to fluid flow in hydrophobic microchannels.

Online publication date: Wed, 30-Apr-2008

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