Electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte
© 2020 American Physical Society. We report that an electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte, as opposed to the well-known one, is initiated exclusively at the enriched interface (anode), rather than at the depleted one (cathode). For th...
| Main Authors: | , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
American Physical Society (APS)
2021
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| Online Access: | https://hdl.handle.net/1721.1/135428 |
| _version_ | 1826191670227501056 |
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| author | Xu, Bingrui Gu, Zhibo Liu, Wei Huo, Peng Zhou, Yueting Rubinstein, SM Bazant, MZ Zaltzman, B Rubinstein, I Deng, Daosheng |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering Xu, Bingrui Gu, Zhibo Liu, Wei Huo, Peng Zhou, Yueting Rubinstein, SM Bazant, MZ Zaltzman, B Rubinstein, I Deng, Daosheng |
| author_sort | Xu, Bingrui |
| collection | MIT |
| description | © 2020 American Physical Society. We report that an electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte, as opposed to the well-known one, is initiated exclusively at the enriched interface (anode), rather than at the depleted one (cathode). For this instability, the limitation of an unrealistically high material Peclet number in planar geometry is eliminated by the strong electric field arising from the line charge singularity. In a model setup of concentric circular electrodes, we show by stability analysis, numerical simulation, and experimental visualization that instability occurs at the inner anode, below a critical radius of curvature. The stability criterion is also formulated in terms of a critical electric field and extended to arbitrary (two-dimensional) geometries by conformal mapping. This discovery suggests that transport may be enhanced in processes limited by salt enrichment, such as reverse osmosis, by triggering this instability with needlelike electrodes. |
| first_indexed | 2024-09-23T08:59:32Z |
| format | Article |
| id | mit-1721.1/135428 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:59:32Z |
| publishDate | 2021 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1354282023-02-16T19:50:11Z Electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte Xu, Bingrui Gu, Zhibo Liu, Wei Huo, Peng Zhou, Yueting Rubinstein, SM Bazant, MZ Zaltzman, B Rubinstein, I Deng, Daosheng Massachusetts Institute of Technology. Department of Chemical Engineering Massachusetts Institute of Technology. Department of Mathematics © 2020 American Physical Society. We report that an electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte, as opposed to the well-known one, is initiated exclusively at the enriched interface (anode), rather than at the depleted one (cathode). For this instability, the limitation of an unrealistically high material Peclet number in planar geometry is eliminated by the strong electric field arising from the line charge singularity. In a model setup of concentric circular electrodes, we show by stability analysis, numerical simulation, and experimental visualization that instability occurs at the inner anode, below a critical radius of curvature. The stability criterion is also formulated in terms of a critical electric field and extended to arbitrary (two-dimensional) geometries by conformal mapping. This discovery suggests that transport may be enhanced in processes limited by salt enrichment, such as reverse osmosis, by triggering this instability with needlelike electrodes. 2021-10-27T20:23:26Z 2021-10-27T20:23:26Z 2020 2021-06-07T17:26:28Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/135428 en 10.1103/PHYSREVFLUIDS.5.091701 Physical Review Fluids Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society (APS) APS |
| spellingShingle | Xu, Bingrui Gu, Zhibo Liu, Wei Huo, Peng Zhou, Yueting Rubinstein, SM Bazant, MZ Zaltzman, B Rubinstein, I Deng, Daosheng Electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte |
| title | Electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte |
| title_full | Electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte |
| title_fullStr | Electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte |
| title_full_unstemmed | Electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte |
| title_short | Electro-osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte |
| title_sort | electro osmotic instability of concentration enrichment in curved geometries for an aqueous electrolyte |
| url | https://hdl.handle.net/1721.1/135428 |
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