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논문 기본 정보

자료유형
학술저널
저자정보
Chun Myung-Suk (Complex Fluids Research Lab., Korea Institute of Science and Technology [KIST]) Lee Tae Seok (Complex Fluids Research Lab., Korea Institute of Science and Technology [KIST]) Lee Kangtaek (Dept. of Chemical Eng., Yonsei University)
저널정보
한국유변학회 Korea-Australia rheology journal Korea-Australia rheology journal 제17권 제4호
발행연도
2005.1
수록면
207 - 215 (9page)

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We present a finite difference solution for electrokinetic flow in rectangular microchannels encompassing Navier's fluid slip phenomena. The externally applied body force originated from between the nonlinear Poisson-Boltzmann field around the channel wall and the flow-induced electric field is employed in the equation of motion. The basic principle of net current conservation is applied in the ion transport. The effects of the slip length and the long-range repulsion upon the velocity profile are examined in conjunction with the friction factor. It is evident that the fluid slip counteracts the effect by the electric double layer and induces a larger flow rate. Particle streak imaging by fluorescent microscope and the data processing method developed ourselves are applied to straight channel designed to allow for flow visualization of dilute latex colloids underlying the condition of simple fluid. The reliability of the velocity profile determined by the flow imaging is justified by comparing with the finite difference solution. We recognized the behavior of fluid slip in velocity profiles at the hydrophobic surface of polydimethylsiloxane wall, from which the slip length was evaluated for different conditions.

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