Time-dependent Electrokinetic Flows in Microfluidic Channel with Hydrodynamic Slippage Effect

Title
Time-dependent Electrokinetic Flows in Microfluidic Channel with Hydrodynamic Slippage Effect
Authors
전명석
Keywords
Electrokinetic Flow; Microfluidics; Hydrodynamic Slip
Issue Date
2013-08
Publisher
WCCE9 & APCChE2013
Citation
VOL 9, 103-103
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/45758
Appears in Collections:
KIST Publication > Conference Paper
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