Pumping Performance Analysis Induced by Travelling wave Electric Fields of AC Electroosmotic Micro-pumps
| Autor: | Meng-Hua Chung, 莊孟樺 |
|---|---|
| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 In this study, four different models of microelectrodes, namely asymmetric arrays and symmetric arrays patterned on the lower side of a microchannel, symmetric arrays and stagger arrays patterned on the upper and lower sides of a microchannel for pumping electrolyte in a microchannel are simulated, respectively. Traveling-wave potentials are formed in the microchannel when four-phase AC potentials are applied to the symmetric electrode arrays. AC electroosmosis are formed in the microchannel when single phase AC potentials are applied to the asymmetric electrodes arrays. The velocities induced by the four-phase AC potentials is large than those induced by the single phase AC potentials. We examined the effects of the relative positioning of the electrodes in the opposing arrays (i.e., symmetrical or staggered arrays) and the phase lag and the angular frequency of the AC signals applied to the electrodes within the two arrays. A critical height of the microchannel was observed, below which the interactions of the applied electrical potentials on the walls became significant. The experiment of the induced AC electroosmotic flow within the microchannel with asymmetric electrode arrays on its lower side is also be done at the induced velocities at different heights within the microchannel can not be recognized in the experiment. As the result, the experimental velocities within the microchannel is about 70％ less than the simulated resultes. Overall, the simulation results presented in this study provide a useful insight into the optimal design parameters and operating conditions for micropumps containing two arrays of microelectrodes on the microchannel walls. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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