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Yangyang Wang Yong Kweon Suh Sangmo Kang 《Journal of Mechanical Science and Technology》2009,23(3):874-884
In numerical studies on microscale electroosmotic flows, the electric double layer (EDL) effect is usually predicted by solving
the traditional Navier-Stokes equation subjected to the slip velocity induced by the electric-charged wall as a boundary condition.
Recently, Suh and Kang (Physical Review E 77, 2008) presented the asymptotic solutions of the ion transport equations near a polarized electrode under the action of an
AC field, and then proposed a new theoretical model of the slip velocity on the electrode considering the ion adsorption effect.
In the present paper, we apply the model to a two-dimensional AC-electroosmotic flow in a microchannel to calculate the slip
velocity on a pair of coplanar asymmetric electrodes embedded on the bottom wall, and then experimentally measure the slip
velocity using the micro-PIV technique to validate the theoretical model. Comparison shows an excellent overall match between
the theoretical and experimental results, except for on the narrow electrode at low frequencies. Next, we numerically perform
parametric studies regarding the AC frequency, effective Stern-layer thickness and ion adsorption effect to further understand
the characteristics of the AC electroosmotic flow. Results show that, as the frequency increases, the slip velocity also increases.
In addition, the velocity decreases with increasing either Stern-layer thickness or ion adsorption effect.
This paper was recommended for publication in revised form by Associate Editor Dongshin Shin
Sangmo Kang received a B.S. and M.S. degrees from Seoul National University in 1985 and 1987, respectively, and then had worked for five
years in Daewoo Heavy Industries as a field engineer. He also achieved a Ph.D. degree in the field of Mechanical Engineering
from the University of Michigan in 1996. Dr. Kang is currently a Professor at the Division of Mechanical Engineering at Dong-A
University in Busan, Korea. Dr. Kang’s research interests are in the area of micro- and nanofluidics and turbulent flow combined
with the computational fluid dynamics. 相似文献