Electrokinetic‐vortex formation near a two‐part cylinder with same‐sign zeta potentials in a straight microchannel
| Autor: | Yongxin Song, Xinxiang Pan, Chengfa Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Surface Properties Microfluidics Clinical Biochemistry Flow (psychology) 02 engineering and technology 01 natural sciences Biochemistry Analytical Chemistry Physics::Fluid Dynamics Electrokinetic phenomena Electric field Zeta potential Cylinder Computer Simulation Upstream (networking) Microchannel 010401 analytical chemistry Equipment Design Mechanics 021001 nanoscience & nanotechnology 0104 chemical sciences Vortex Models Chemical Electroosmosis 0210 nano-technology |
| Zdroj: | ELECTROPHORESIS. 41:793-801 |
| ISSN: | 1522-2683 0173-0835 |
| Popis: | Vortex formation near a two-part cylinder with zeta potentials of different values but the same sign under an external DC electric field is numerically investigated in this paper. The cylinder, inserted in a straight microchannel filled with an aqueous solution, is composed of an upstream part and a downstream part. When a DC electric field is applied in the channel, under certain conditions, the vortex will form near the cylinder due to the different velocities of electroosmotic flow generated on the cylinder surface. The numerical results reveal that the larger the velocity difference of electroosmotic flow generated on the two-part cylinder and the smaller the channel width, the more conducive to vortex formation in the channel. In addition, if the zeta potential ratios of cylinder downstream part to upstream part and channel wall to cylinder upstream part are unchanged, the DC electric field strength and the zeta potential value do not affect the pattern of vortices formed in the channel. This study provides a way for vortex formation in microchannels and has the potential application in microfluidic devices. |
| Databáze: | OpenAIRE |
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