Active control of viscous fingering using electric fields
| Autor: | Mohammad Mirzadeh, Kameron M. Conforti, Tao Gao, Martin Z. Bazant, Peng Bai |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Materials science Science General Physics and Astronomy 02 engineering and technology Viscous liquid Instability General Biochemistry Genetics and Molecular Biology Article Viscous fingering Physics::Fluid Dynamics 03 medical and health sciences Viscosity Electrokinetic phenomena Fluid dynamics Electric field lcsh:Science Multidisciplinary General Chemistry Mechanics 021001 nanoscience & nanotechnology Applied mathematics Condensed Matter::Soft Condensed Matter 030104 developmental biology lcsh:Q 0210 nano-technology Linear stability |
| Zdroj: | Nature Communications, Vol 10, Iss 1, Pp 1-8 (2019) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | Viscous fingering is a widely observed phenomenon, in which finger-like instabilities occur at the interface of two fluids, whenever a less viscous phase displaces a more viscous phase. This instability is notoriously difficult to control, especially for given viscosity ratio and geometry. Here we demonstrate experimentally the active control of viscous fingering of two given liquids, for given geometry and flow rate in a Hele-Shaw cell. The control is realized by taking advantage of electro-osmotic flows along the surfaces confining the fluid, via applying an external electric field. Depending on the direction of electric field, the induced secondary electro-osmotic flows either assist or oppose the hydraulic flow, effectively reducing or increasing the flow resistance, leading to the control of interface stability. The mechanism of apparent “electrokinetic thinning/thickening” is proposed to explain the experimental observations. Theoretical predictions of linear stability are confirmed experimentally for a broad range of immiscible electrolyte displacements. When a viscous fluid is displaced by a less viscous phase between two plates, a finger-like instability occurs. Here the authors demonstrate how applying an external electric field can suppress the fingering instability without the need to alter the fluid flow rate or the gap geometry. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|