Year: 2017
Communications in Computational Physics, Vol. 22 (2017), Iss. 4 : pp. 1101–1122
Abstract
Electrophoresis of a cylinder suspended in a cylindrical tube is analytically studied in the limit of thin electric double layer approximation. The electric and fluid flow fields within the annulus, and the cylinder velocities are analytically obtained in bipolar coordinates. The results are analyzed with various values of dimensionless parameters: eccentricity, cylinder-to-tube radius ratio and tube-to-cylinder zeta potential ratio (i.e., tube-to-cylinder velocity scale ratio). The analysis shows that microvortices are generated within the annulus. By changing the parameters, different flow patterns can be created, which shows potential for mixing enhancement in micro/nanofluidics. Moreover, the cylinder not only translates but also rotates when the cylinder and tube are eccentric. The cylinder rotation might be utilized as a micromotor or an electric field detector. The cylinder trajectories show that the cylinder may approach the tube wall or rest within the tube depending on the zeta potential ratio.
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Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/cicp.OA-2017-0011
Communications in Computational Physics, Vol. 22 (2017), Iss. 4 : pp. 1101–1122
Published online: 2017-01
AMS Subject Headings: Global Science Press
Copyright: COPYRIGHT: © Global Science Press
Pages: 22
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Induced-charge electro-osmosis in dielectric annuli
Feng, Huicheng
Wong, Teck Neng
Applied Mathematics and Computation, Vol. 333 (2018), Iss. P.133
https://doi.org/10.1016/j.amc.2018.03.106 [Citations: 4]