Abstract
Lattice Boltzmann Study of Virtual Walls in a Surface-Directed Two-Fluid Microchannel
American Physical Society, Division of Fluid Dynamics 56th Annual Meeting (East Rutherford, New Jersey, 11/23/2003 - 11/25/2003)
11/24/2003
Abstract
Understanding the distributions of pressure and velocity in the micro two-fluid system is of paramount importance, for instance, if one wishes to utilize the system for transport and manipulation of macromolecules for physico-chemical and biomedical analyses. Here, we present a lattice Boltzmann equation method for immiscible two-fluid flows and apply it to the dynamics of virtual walls in a surface-directed two-fluid microchannel. Virtual walls (Zhao et al., Science, v.291, p.1023, 2001) can sustain if aqueous solutions flow only along the hydrophilic pathways. The angle of curvature formed by the two fluids must be less than the advancing contact angle of the aqueous solutions; otherwise virtual walls will rupture. Without any surface treatment, virtual walls will always rupture for aqueous solutions at high pressure. Virtual walls may reduce adverse effects of shearing macromolecules due to the existence of solid walls, since the distributions of pressure and velocity near virtual walls are quite different from those near solid walls. We examine the sensitivity of virtual walls to the pressure in the aqueous solutions and the wettability of the surfaces. The pressure and velocity distributions near virtual walls are compared with those near solid walls. The new scheme is numerically stable for density ratio as high as 1,000.
Details
- Title: Subtitle
- Lattice Boltzmann Study of Virtual Walls in a Surface-Directed Two-Fluid Microchannel
- Creators
- Taehun Lee (Author)Ching-Long Lin (Author) - University of Iowa, Mechanical Engineering
- Resource Type
- Abstract
- Conference
- American Physical Society, Division of Fluid Dynamics 56th Annual Meeting (East Rutherford, New Jersey, 11/23/2003 - 11/25/2003)
- Language
- English
- Date published
- 11/24/2003
- Academic Unit
- Mechanical Engineering; Radiology; Roy J. Carver Department of Biomedical Engineering
- Record Identifier
- 9984582849202771
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