The Streaming Potential of Fluid through a Microchannel with Modulated Charged Surfaces
In this paper, the effects of asymmetrically modulated charged surfaces on streaming potential, velocity field and flow rate are investigated under the axial pressure gradient and vertical magnetic field. In a parallel-plate microchannel, modulated charged potentials on the walls are depicted by the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/13/1/66 |
| _version_ | 1797491889911365632 |
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| author | Xinyue Bian Fengqin Li Yongjun Jian |
| author_facet | Xinyue Bian Fengqin Li Yongjun Jian |
| author_sort | Xinyue Bian |
| collection | DOAJ |
| description | In this paper, the effects of asymmetrically modulated charged surfaces on streaming potential, velocity field and flow rate are investigated under the axial pressure gradient and vertical magnetic field. In a parallel-plate microchannel, modulated charged potentials on the walls are depicted by the cosine function. The flow of incompressible Newtonian fluid is two-dimensional due to the modulated charged surfaces. Considering the Debye–Hückel approximation, the Poisson–Boltzmann (PB) equation and the modified Navier-Stokes (N-S) equation are established. The analytical solutions of the potential and velocities (<i>u</i> and <i>v</i>) are obtained by means of the superposition principle and stream function. The unknown streaming potential is determined by the condition that the net ionic current is zero. Finally, the influences of pertinent dimensionless parameters (modulated potential parameters, Hartmann number and slip length) on the flow field, streaming potential, velocity field and flow rate are discussed graphically. During the flow process and under the impact of the charge-modulated potentials, the velocity profiles present an oscillating characteristic, and vortexes are generated. The results show that the charge-modulated potentials are beneficial for the enhancement of the streaming potential, velocity and flow rate, which also facilitate the mixing of fluids. Meanwhile, the flow rate can be controlled through the use of a low-amplitude magnetic field. |
| first_indexed | 2024-03-10T00:54:47Z |
| format | Article |
| id | doaj.art-62f2f2e4e9b74c9093f09676913c0987 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-10T00:54:47Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-62f2f2e4e9b74c9093f09676913c09872023-11-23T14:44:20ZengMDPI AGMicromachines2072-666X2021-12-011316610.3390/mi13010066The Streaming Potential of Fluid through a Microchannel with Modulated Charged SurfacesXinyue Bian0Fengqin Li1Yongjun Jian2School of Mathematical Science, Inner Mongolia University, Hohhot 010021, ChinaSchool of Mathematical Science, Inner Mongolia University, Hohhot 010021, ChinaSchool of Mathematical Science, Inner Mongolia University, Hohhot 010021, ChinaIn this paper, the effects of asymmetrically modulated charged surfaces on streaming potential, velocity field and flow rate are investigated under the axial pressure gradient and vertical magnetic field. In a parallel-plate microchannel, modulated charged potentials on the walls are depicted by the cosine function. The flow of incompressible Newtonian fluid is two-dimensional due to the modulated charged surfaces. Considering the Debye–Hückel approximation, the Poisson–Boltzmann (PB) equation and the modified Navier-Stokes (N-S) equation are established. The analytical solutions of the potential and velocities (<i>u</i> and <i>v</i>) are obtained by means of the superposition principle and stream function. The unknown streaming potential is determined by the condition that the net ionic current is zero. Finally, the influences of pertinent dimensionless parameters (modulated potential parameters, Hartmann number and slip length) on the flow field, streaming potential, velocity field and flow rate are discussed graphically. During the flow process and under the impact of the charge-modulated potentials, the velocity profiles present an oscillating characteristic, and vortexes are generated. The results show that the charge-modulated potentials are beneficial for the enhancement of the streaming potential, velocity and flow rate, which also facilitate the mixing of fluids. Meanwhile, the flow rate can be controlled through the use of a low-amplitude magnetic field.https://www.mdpi.com/2072-666X/13/1/66modulated charged potentialelectric double layer (EDL)streaming potentialmicrochannel |
| spellingShingle | Xinyue Bian Fengqin Li Yongjun Jian The Streaming Potential of Fluid through a Microchannel with Modulated Charged Surfaces Micromachines modulated charged potential electric double layer (EDL) streaming potential microchannel |
| title | The Streaming Potential of Fluid through a Microchannel with Modulated Charged Surfaces |
| title_full | The Streaming Potential of Fluid through a Microchannel with Modulated Charged Surfaces |
| title_fullStr | The Streaming Potential of Fluid through a Microchannel with Modulated Charged Surfaces |
| title_full_unstemmed | The Streaming Potential of Fluid through a Microchannel with Modulated Charged Surfaces |
| title_short | The Streaming Potential of Fluid through a Microchannel with Modulated Charged Surfaces |
| title_sort | streaming potential of fluid through a microchannel with modulated charged surfaces |
| topic | modulated charged potential electric double layer (EDL) streaming potential microchannel |
| url | https://www.mdpi.com/2072-666X/13/1/66 |
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