Time-dependent Electrokinetic Flows in Microfluidic Channel with Hydrodynamic Slippage Effect
- Time-dependent Electrokinetic Flows in Microfluidic Channel with Hydrodynamic Slippage Effect
- Electrokinetic Flow; Microfluidics; Hydrodynamic Slip
- Issue Date
- WCCE9 & APCChE2013
- VOL 9, 103-103
- The nature of low Reynolds number flows and the small dimension inherent in microscale or nanoscale channels imply the significant
influence of solid wall boundaries [1,2]. We investigate the externally time-dependent pulsatile electrokinetic flows by extending the previous
simulations concerning the electrokinetic microfluidics for different geometries [3,4]. The body force originated from between the nonlinear
Poisson–Boltzmann field and the flow-induced electric field is employed in the Navier–Stokes equation, and the Nernst–Planck equation
in connection with the net current conservation is further coupled. Our explicit model allows one to quantify the effects of the oscillating
frequency and conductance of the Stern layer, considering the fluid slippage at hydrophobic surfaces and the strong electric double layer
interaction. This presentation reports the new results regarding the implication of high-frequency pressure pulsations toward realizing
mechanical to electrical energy transfer with high conversion efficiencies. A combined role of the fluid slippage and Stern layer conductance
of channel wall is examined to obtain possible enhancements of streamwise velocity and streaming potential, with taking advantage of
pulsating pressure field. From experimental verifications by using electrokinetic power cell, it is concluded that our theoretical framework can
serve as a useful basis for micro/nanofluidics design and fabrications.
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- KIST Publication > Conference Paper
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