ELECTROKINETIC SLIP FLOW OF MICROFLUIDICS IN TERMS OF STREAMING POTENTIAL BY A LATTICE BOLTZMANN METHOD: A BOTTOM-UP APPROACH

Xin Fu, Baoming Li, Junfeng Zhang, Fuzhi Tian and Daniel Y. Kwok ()
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Xin Fu: National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing, 210094, China
Baoming Li: National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing, 210094, China
Junfeng Zhang: Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, MD 21205, USA
Fuzhi Tian: Nanotechnology and Engineering Laboratory, Department of Mechanical Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada
Daniel Y. Kwok: Nanotechnology and Engineering Laboratory, Department of Mechanical Engineering, Schulich School of Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada

International Journal of Modern Physics C (IJMPC), 2007, vol. 18, issue 04, 693-700

Abstract: In traditional computational fluid dynamics, the effect of surface energetics on fluid flow is often ignored or translated into an arbitrary selected slip boundary condition in solving the Navier-Stokes equation. Using a bottom-up approach, we show in this paper that variation of surface energetics through intermolecular theory can be employed in a lattice Boltzmann method to investigate both slip and non-slip phenomena in microfluidics in conjunction with the description of electrokinetic phenomena for electrokinetic slip flow. Rather than using the conventional Navier-Stokes equation with a slip boundary condition, the description of electrokinetic slip flow in microfluidics is manifested by the more physical solid-liquid energy parameters, electrical double layer and contact angle in the mean-field description of the lattice Boltzmann method.

Keywords: Lattice Boltzmann method; microfluidics; electric double layer; slip; electrokinetics; contact angles; 11.25.Hf; 123.1K (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1142/S0129183107010954

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