International Journal of Information Technology | |
Oscillatory Electroosmotic Flow of Power-Law Fluids in a Microchannel | |
Rubén Bãnos ; José Arcos ; Oscar Bautista ; Federico Méndez | |
关键词: Oscillatory electroosmotic flow; Non-Newtonian fluids; power-law model; low zeta potentials.; | |
DOI : 10.1999/1307-6892/10009307 | |
学科分类:计算机应用 | |
来源: World Academy of Science, Engineering and Technology (W A S E T) | |
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【 摘 要 】
The Oscillatory electroosmotic flow (OEOF) in power law fluids through a microchannel is studied numerically. A time-dependent external electric field (AC) is suddenly imposed at the ends of the microchannel which induces the fluid motion. The continuity and momentum equations in the x and y direction for the flow field were simplified in the limit of the lubrication approximation theory (LAT), and then solved using a numerical scheme. The solution of the electric potential is based on the Debye-H¨uckel approximation which suggest that the surface potential is small,say, smaller than 0.025V and for a symmetric (z : z) electrolyte. Our results suggest that the velocity profiles across the channel-width are controlled by the following dimensionless parameters: the angular Reynolds number, Reω, the electrokinetic parameter, ¯κ, defined as the ratio of the characteristic length scale to the Debye length, the parameter λ which represents the ratio of the Helmholtz-Smoluchowski velocity to the characteristic length scale and the flow behavior index, n. Also, the results reveal that the velocity profiles become more and more non-uniform across the channel-width as the Reω and ¯κ are increased, so oscillatory OEOF can be really useful in micro-fluidic devices such as micro-mixers.
【 授权许可】
Unknown
【 预 览 】
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RO201910280719662ZK.pdf | 217KB | ![]() |