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Streaming potential of superhydrophobic microchannels
Hung Mok Park1, Damoa Kim1, Se Young Kim1
1Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, South Korea.
Electrophoresis
|December 10, 2016
Summary
Superhydrophobic microchannels enhance streaming potential, but their design impacts results. Characterizing these surfaces requires understanding their fine structure, not just flow rate versus pressure drop.
Area of Science:
- Fluid dynamics
- Surface science
- Electrokinetics
Background:
- Superhydrophobic surfaces offer increased velocity slip in microchannels for enhanced streaming potential.
- Two types exist: smooth walls with high Navier slip and surfaces with no-shear slots.
Purpose of the Study:
- To model and compare electrokinetic flows over two distinct superhydrophobic surface types.
- To investigate the influence of surface parameters on streaming potential and flow rate.
Main Methods:
- Navier-Stokes and convection-diffusion equations were used to model electrokinetic flows.
- Simulations analyzed surfaces with varying Navier slip coefficients and no-shear slot ratios.
Main Results:
- Volumetric flow rate increases with both Navier slip coefficient and no-shear slot ratio.
- Streaming potential increases monotonically with Navier slip coefficient.
- Streaming potential peaks and then decreases as the no-shear slot ratio increases.
Conclusions:
- Volumetric flow rate alone is insufficient for characterizing superhydrophobic surfaces.
- Accurate prediction of streaming potential and electrokinetic flows necessitates verification of the surface's fine structure.
