Electromigration and micromixing through a constriction under time periodic electroosmotic flow
Mixing in a microchannel is a challenging task due to the small Reynolds numbers. A simple yet an efficient novel approach to enhance mixing has been proposed in this thesis. The concept was demonstrated in a T-type micromixer with a constriction introduced at the T-junction under time periodic elec...
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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2012
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| Online Access: | https://hdl.handle.net/10356/50640 |
| _version_ | 1826129921199570944 |
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| author | Lim, Chun Yee |
| author2 | Yang Chun, Charles |
| author_facet | Yang Chun, Charles Lim, Chun Yee |
| author_sort | Lim, Chun Yee |
| collection | NTU |
| description | Mixing in a microchannel is a challenging task due to the small Reynolds numbers. A simple yet an efficient novel approach to enhance mixing has been proposed in this thesis. The concept was demonstrated in a T-type micromixer with a constriction introduced at the T-junction under time periodic electroosmotic flow induced by applied AC voltages. Mechanism of mixing enhancement and factors governing the mixing efficiency have been investigated. Numerical analyses of the proposed micromixer were conducted with finite element method. For an accurate simulation of flow behavior in a practical micromixer, the often neglected electromigration effect of charged solute/fluorescent dye must be considered. In view of the importance of the electromigration effect, a method to measure ionic mobility of the fluorescent dye has been adapted from the micromixer design. A new numerical formulation has also been developed to elucidate the mechanism behind the directional dependence of displacement time for two- fluid electroosmotic flow. |
| first_indexed | 2024-10-01T07:48:25Z |
| format | Thesis |
| id | ntu-10356/50640 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:48:25Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/506402023-03-11T17:27:48Z Electromigration and micromixing through a constriction under time periodic electroosmotic flow Lim, Chun Yee Yang Chun, Charles Lam Yee Cheong School of Mechanical and Aerospace Engineering DRNTU::Engineering::Mechanical engineering::Fluid mechanics Mixing in a microchannel is a challenging task due to the small Reynolds numbers. A simple yet an efficient novel approach to enhance mixing has been proposed in this thesis. The concept was demonstrated in a T-type micromixer with a constriction introduced at the T-junction under time periodic electroosmotic flow induced by applied AC voltages. Mechanism of mixing enhancement and factors governing the mixing efficiency have been investigated. Numerical analyses of the proposed micromixer were conducted with finite element method. For an accurate simulation of flow behavior in a practical micromixer, the often neglected electromigration effect of charged solute/fluorescent dye must be considered. In view of the importance of the electromigration effect, a method to measure ionic mobility of the fluorescent dye has been adapted from the micromixer design. A new numerical formulation has also been developed to elucidate the mechanism behind the directional dependence of displacement time for two- fluid electroosmotic flow. DOCTOR OF PHILOSOPHY (MAE) 2012-08-14T04:20:38Z 2012-08-14T04:20:38Z 2012 2012 Thesis Lim, C. Y. (2012). Electromigration and micromixing through a constriction under time periodic electroosmotic flow. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/50640 10.32657/10356/50640 en 233 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Mechanical engineering::Fluid mechanics Lim, Chun Yee Electromigration and micromixing through a constriction under time periodic electroosmotic flow |
| title | Electromigration and micromixing through a constriction under time periodic electroosmotic flow |
| title_full | Electromigration and micromixing through a constriction under time periodic electroosmotic flow |
| title_fullStr | Electromigration and micromixing through a constriction under time periodic electroosmotic flow |
| title_full_unstemmed | Electromigration and micromixing through a constriction under time periodic electroosmotic flow |
| title_short | Electromigration and micromixing through a constriction under time periodic electroosmotic flow |
| title_sort | electromigration and micromixing through a constriction under time periodic electroosmotic flow |
| topic | DRNTU::Engineering::Mechanical engineering::Fluid mechanics |
| url | https://hdl.handle.net/10356/50640 |
| work_keys_str_mv | AT limchunyee electromigrationandmicromixingthroughaconstrictionundertimeperiodicelectroosmoticflow |