Numerical simulation of electroosmotic flow in hydrophobic microchannels |
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Authors: | DaYong Yang Ying Liu |
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Affiliation: | (1) School of Mechanical & Electrical Engineering, Nanchang University, Nanchang, 330031, China |
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Abstract: | Electroosmotic flow (EOF) is a promising way for driving and mixing fluids in microfluidics. For the parallel-plate microchannel
with the hydrophobic surface, this paper solved the governing equations using the finite element method (FEM), and the effects
of microchannel height, electric strength and ionic concentration on EOF were thus investigated. The simulation indicates
that the transient characteristics of EOF are similar in hydrophobic and hydrophilic microchannels, the steady time of EOF
is proportional to the square of microchannel height, and the scale is microsecond. EOF velocity is proportional to the electric
strength and independent of the channel height, and decreases slowly with the ionic concentration, which is lower than that
in hydrophilic microchannel due to the presence of slip length in hydrophobic microchannel. The results can provide valuable
insights into the optimal design of microchannel surfaces to achieve accurate EOF control in hydrophobic microchannel.
Supported by the National Natural Science Foundation of China (Grant No. 50730007) |
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Keywords: | microchannel electroosmotic flow (EOF) hydrophobic surface slip length FEM |
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