Numerical Simulation of Electroosmotic Flow with Step Change in Zeta Potential
Electroosmotic flow is a convenient mechanism for transporting polar fluid in a microfluidic device. The flow is generated through the application of an external electric field that acts on the free charges that exists in a thin Debye layer at the channel walls. The charge on the wall is due to the...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
2004
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| Online Access: | http://hdl.handle.net/1721.1/7457 |
| _version_ | 1826207836315582464 |
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| author | Chen, X. Lam, Yee Cheong Chen, X. Y. Chai, J.C. Yang, C. |
| author_facet | Chen, X. Lam, Yee Cheong Chen, X. Y. Chai, J.C. Yang, C. |
| author_sort | Chen, X. |
| collection | MIT |
| description | Electroosmotic flow is a convenient mechanism for transporting polar fluid in a microfluidic device. The flow is generated through the application of an external electric field that acts on the free charges that exists in a thin Debye layer at the channel walls. The charge on the wall is due to the chemistry of the solid-fluid interface, and it can vary along the channel, e.g. due to modification of the wall. This investigation focuses on the simulation of the electroosmotic flow (EOF) profile in a cylindrical microchannel with step change in zeta potential. The modified Navier-Stoke equation governing the velocity field and a non-linear two-dimensional Poisson-Boltzmann equation governing the electrical double-layer (EDL) field distribution are solved numerically using finite control-volume method. Continuities of flow rate and electric current are enforced resulting in a non-uniform electrical field and pressure gradient distribution along the channel. The resulting parabolic velocity distribution at the junction of the step change in zeta potential, which is more typical of a pressure-driven velocity flow profile, is obtained. |
| first_indexed | 2024-09-23T13:55:43Z |
| format | Article |
| id | mit-1721.1/7457 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T13:55:43Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | mit-1721.1/74572019-04-12T07:20:56Z Numerical Simulation of Electroosmotic Flow with Step Change in Zeta Potential Chen, X. Lam, Yee Cheong Chen, X. Y. Chai, J.C. Yang, C. Electroosmotic flow Electrical double-layer Pressure-driven flow Zeta potential Electroosmotic flow is a convenient mechanism for transporting polar fluid in a microfluidic device. The flow is generated through the application of an external electric field that acts on the free charges that exists in a thin Debye layer at the channel walls. The charge on the wall is due to the chemistry of the solid-fluid interface, and it can vary along the channel, e.g. due to modification of the wall. This investigation focuses on the simulation of the electroosmotic flow (EOF) profile in a cylindrical microchannel with step change in zeta potential. The modified Navier-Stoke equation governing the velocity field and a non-linear two-dimensional Poisson-Boltzmann equation governing the electrical double-layer (EDL) field distribution are solved numerically using finite control-volume method. Continuities of flow rate and electric current are enforced resulting in a non-uniform electrical field and pressure gradient distribution along the channel. The resulting parabolic velocity distribution at the junction of the step change in zeta potential, which is more typical of a pressure-driven velocity flow profile, is obtained. Singapore-MIT Alliance (SMA) 2004-12-14T20:31:44Z 2004-12-14T20:31:44Z 2005-01 Article http://hdl.handle.net/1721.1/7457 en Innovation in Manufacturing Systems and Technology (IMST); 171568 bytes application/pdf application/pdf |
| spellingShingle | Electroosmotic flow Electrical double-layer Pressure-driven flow Zeta potential Chen, X. Lam, Yee Cheong Chen, X. Y. Chai, J.C. Yang, C. Numerical Simulation of Electroosmotic Flow with Step Change in Zeta Potential |
| title | Numerical Simulation of Electroosmotic Flow with Step Change in Zeta Potential |
| title_full | Numerical Simulation of Electroosmotic Flow with Step Change in Zeta Potential |
| title_fullStr | Numerical Simulation of Electroosmotic Flow with Step Change in Zeta Potential |
| title_full_unstemmed | Numerical Simulation of Electroosmotic Flow with Step Change in Zeta Potential |
| title_short | Numerical Simulation of Electroosmotic Flow with Step Change in Zeta Potential |
| title_sort | numerical simulation of electroosmotic flow with step change in zeta potential |
| topic | Electroosmotic flow Electrical double-layer Pressure-driven flow Zeta potential |
| url | http://hdl.handle.net/1721.1/7457 |
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