Pulsatile pressure-driven electrokinetic flows in microfluidic channels with hydrodynamic slippage effect

Title
Pulsatile pressure-driven electrokinetic flows in microfluidic channels with hydrodynamic slippage effect
Authors
전명석김광석
Keywords
Pulsatile flow; Electrokinetic flow; Microfluidics; Hydrodynamic slippage; Colloid
Issue Date
2011-06
Publisher
85th ACS Colloid & Surface Science Symposium
Citation
VOL 85, 224-224
Abstract
The nature of low Reynolds number flows and the small dimension inherent in charged microscale or nanoscale channels imply the significant influence of wall boundaries [1]. We investigate the externally pulsating pressure-driven electrokinetic flows by extending the previous simulation framework concerning the electrokinetic microfluidics for different geometries [2,3]. 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 verify the effects of the oscillating frequency and conductance of the Stern layer, considering the Navier's fluid slippage at the hydrophobic surface and the strong electric double layer (EDL) 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 in the thick EDL is examined to obtain possible enhancements of streamwise velocity and streaming potential, with taking advantage of pulsating pressure field. Our theoretical predictions can serve as a useful basis for micro/nanofluidics design and fabrications.
URI
http://pubs.kist.re.kr/handle/201004/39942
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KIST Publication > Conference Paper
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