Active Saffman-Taylor Viscous Fingering
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866916651264376832 |
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| author | Ganesh, Akash Douarche, Carine Auradou, Harold |
| author_facet | Ganesh, Akash Douarche, Carine Auradou, Harold |
| contents | Adding swimming bacteria to a liquid causes its effective shear viscosity to decrease, eventually reaching a regime of zero viscosity. We examined whether this property leads to viscous finger-like displacement fronts like those observed when a less viscous fluid displaces a more viscous liquid. Our study revealed that this system exhibits more complex dynamic characteristics than the classical Saffman-Taylor instability. We discovered that this instability occurs when the bacterial volume fraction exceeds a critical value, and the imposed shear rate is below critical value, for which the viscosity of the suspension is zero. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_09608 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Active Saffman-Taylor Viscous Fingering Ganesh, Akash Douarche, Carine Auradou, Harold Soft Condensed Matter Adding swimming bacteria to a liquid causes its effective shear viscosity to decrease, eventually reaching a regime of zero viscosity. We examined whether this property leads to viscous finger-like displacement fronts like those observed when a less viscous fluid displaces a more viscous liquid. Our study revealed that this system exhibits more complex dynamic characteristics than the classical Saffman-Taylor instability. We discovered that this instability occurs when the bacterial volume fraction exceeds a critical value, and the imposed shear rate is below critical value, for which the viscosity of the suspension is zero. |
| title | Active Saffman-Taylor Viscous Fingering |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2503.09608 |