Effect of capillary geometry on predicting electroosmotic volumetric flowrates in porous or fibrous media

Journal of Colloid and Interface Science
Jennifer PascalPedro Arce

Abstract

Electrokinetic-based methods are used in a variety of applications including drug delivery and separation of biomolecules, among others. Many of these applications feature a fibrous or a porous medium that can be modeled by using capillary bundle models to predict the behavior of the electroosmotic flow within the particular system. The role of geometry in predicting volumetric flowrates in porous media is investigated by modeling the electroosmotic flow in idealized capillaries of rectangular, cylindrical, and annular geometries. This is achieved by the coupling of electrostatics and continuum hydrodynamics to obtain analytical expressions that govern the electrokinetically - driven volumetric flow within these idealized capillary geometries. A previous study developed a model to compare the cylindrical and annular capillary geometries by utilizing two methods that compare the areas of the two geometries. The methods used in this previous work will also be used in the present contribution to compare the volumetric flowrates in the cylindrical and annular capillaries with a rectangular capillary. Illustrative results will be presented to aid in the understanding of the influence of the various geometrical and electrostatic para...Continue Reading

References

Nov 22, 1997·Journal of Chromatography. a·A S Rathore, C Horváth
May 1, 1996·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·A Ajdari
Jan 10, 2006·Electrophoresis·Nataliya A Mishchuk, Fernando González-Caballero
Jul 26, 2008·Electrophoresis·Chien C Chang, Chang Yi Wang

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