Geometry-dependent viscosity reduction in sheared active fluids
We investigate flow pattern formation and viscosity reduction mechanisms in active fluids by studying a generalized Navier-Stokes model that captures the experimentally observed bulk vortex dynamics in microbial suspensions. We present exact analytical solutions including stress-free vortex lattices...
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| Format: | Article |
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American Physical Society (APS)
2018
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| Online Access: | http://hdl.handle.net/1721.1/115406 https://orcid.org/0000-0002-0464-2700 https://orcid.org/0000-0001-8865-2369 |
| _version_ | 1826215419929690112 |
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| author | Slomka, Jonasz Jozef Dunkel, Joern |
| author2 | Massachusetts Institute of Technology. Department of Mathematics |
| author_facet | Massachusetts Institute of Technology. Department of Mathematics Slomka, Jonasz Jozef Dunkel, Joern |
| author_sort | Slomka, Jonasz Jozef |
| collection | MIT |
| description | We investigate flow pattern formation and viscosity reduction mechanisms in active fluids by studying a generalized Navier-Stokes model that captures the experimentally observed bulk vortex dynamics in microbial suspensions. We present exact analytical solutions including stress-free vortex lattices and introduce a computational framework that allows the efficient treatment of higher-order shear boundary conditions. Large-scale parameter scans identify the conditions for spontaneous flow symmetry breaking, geometry-dependent viscosity reduction, and negative-viscosity states amenable to energy harvesting in confined suspensions. The theory uses only generic assumptions about the symmetries and long -wavelength structure of active stress tensors, suggesting that inviscid phases may be achievable in a broad class of nonequilibrium fluids by tuning confinement geometry and pattern scale selection. |
| first_indexed | 2024-09-23T16:29:03Z |
| format | Article |
| id | mit-1721.1/115406 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T16:29:03Z |
| publishDate | 2018 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1154062022-10-02T08:07:44Z Geometry-dependent viscosity reduction in sheared active fluids Slomka, Jonasz Jozef Dunkel, Joern Massachusetts Institute of Technology. Department of Mathematics Slomka, Jonasz Jozef Dunkel, Joern We investigate flow pattern formation and viscosity reduction mechanisms in active fluids by studying a generalized Navier-Stokes model that captures the experimentally observed bulk vortex dynamics in microbial suspensions. We present exact analytical solutions including stress-free vortex lattices and introduce a computational framework that allows the efficient treatment of higher-order shear boundary conditions. Large-scale parameter scans identify the conditions for spontaneous flow symmetry breaking, geometry-dependent viscosity reduction, and negative-viscosity states amenable to energy harvesting in confined suspensions. The theory uses only generic assumptions about the symmetries and long -wavelength structure of active stress tensors, suggesting that inviscid phases may be achievable in a broad class of nonequilibrium fluids by tuning confinement geometry and pattern scale selection. Solomon Buchsbaum AT&T Research Fund Alfred P. Sloan Foundation. Fellowship Massachusetts Institute of Technology. Department of Mathematics (Edmund F. Kelly Research Award) 2018-05-16T17:33:44Z 2018-05-16T17:33:44Z 2017-04 2016-08 2018-05-08T13:43:33Z Article http://purl.org/eprint/type/JournalArticle 2469-990X http://hdl.handle.net/1721.1/115406 Słomka, Jonasz, and Jörn Dunkel. “Geometry-Dependent Viscosity Reduction in Sheared Active Fluids.” Physical Review Fluids, vol. 2, no. 4, Apr. 2017. © 2017 American Physical Society. https://orcid.org/0000-0002-0464-2700 https://orcid.org/0000-0001-8865-2369 http://dx.doi.org/10.1103/PHYSREVFLUIDS.2.043102 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 | Slomka, Jonasz Jozef Dunkel, Joern Geometry-dependent viscosity reduction in sheared active fluids |
| title | Geometry-dependent viscosity reduction in sheared active fluids |
| title_full | Geometry-dependent viscosity reduction in sheared active fluids |
| title_fullStr | Geometry-dependent viscosity reduction in sheared active fluids |
| title_full_unstemmed | Geometry-dependent viscosity reduction in sheared active fluids |
| title_short | Geometry-dependent viscosity reduction in sheared active fluids |
| title_sort | geometry dependent viscosity reduction in sheared active fluids |
| url | http://hdl.handle.net/1721.1/115406 https://orcid.org/0000-0002-0464-2700 https://orcid.org/0000-0001-8865-2369 |
| work_keys_str_mv | AT slomkajonaszjozef geometrydependentviscosityreductioninshearedactivefluids AT dunkeljoern geometrydependentviscosityreductioninshearedactivefluids |