Spectral Universality of Elastoinertial Turbulence
Dissolving small amounts of polymer into a Newtonian fluid can dramatically change the dynamics of transitional and turbulent flows. We investigate the spatiotemporal dynamics of a submerged jet of dilute polymer solution entering a quiescent bath of Newtonian fluid. High-speed digital Schlieren ima...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society (APS)
2021
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| Online Access: | https://hdl.handle.net/1721.1/138470 |
| _version_ | 1826189743012970496 |
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| author | Yamani, Sami Keshavarz, Bavand Raj, Yashasvi Zaki, Tamer A McKinley, Gareth H Bischofberger, Irmgard |
| author_facet | Yamani, Sami Keshavarz, Bavand Raj, Yashasvi Zaki, Tamer A McKinley, Gareth H Bischofberger, Irmgard |
| author_sort | Yamani, Sami |
| collection | MIT |
| description | Dissolving small amounts of polymer into a Newtonian fluid can dramatically change the dynamics of transitional and turbulent flows. We investigate the spatiotemporal dynamics of a submerged jet of dilute polymer solution entering a quiescent bath of Newtonian fluid. High-speed digital Schlieren imaging is used to quantify the evolution of Lagrangian features in the jet revealing a rich sequence of transitional and turbulent states. At high levels of viscoelasticity, we identify a new distinct transitional pathway to elastoinertial turbulence (EIT) that does not feature the conventional turbulent bursts and instead proceeds via a shear-layer instability that produces elongated filaments of polymer due to the nonlinear effects of viscoelasticity. Even though the pathways to the EIT state can be different, and within EIT the spatial details of the turbulent structures vary systematically with polymer microstructure and concentration, there is a universality in the power-law spectral decay of EIT with frequency, f^{-3}, independent of fluid rheology and flow parameters. |
| first_indexed | 2024-09-23T08:20:23Z |
| format | Article |
| id | mit-1721.1/138470 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T08:20:23Z |
| publishDate | 2021 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1384702021-12-15T03:39:32Z Spectral Universality of Elastoinertial Turbulence Yamani, Sami Keshavarz, Bavand Raj, Yashasvi Zaki, Tamer A McKinley, Gareth H Bischofberger, Irmgard Dissolving small amounts of polymer into a Newtonian fluid can dramatically change the dynamics of transitional and turbulent flows. We investigate the spatiotemporal dynamics of a submerged jet of dilute polymer solution entering a quiescent bath of Newtonian fluid. High-speed digital Schlieren imaging is used to quantify the evolution of Lagrangian features in the jet revealing a rich sequence of transitional and turbulent states. At high levels of viscoelasticity, we identify a new distinct transitional pathway to elastoinertial turbulence (EIT) that does not feature the conventional turbulent bursts and instead proceeds via a shear-layer instability that produces elongated filaments of polymer due to the nonlinear effects of viscoelasticity. Even though the pathways to the EIT state can be different, and within EIT the spatial details of the turbulent structures vary systematically with polymer microstructure and concentration, there is a universality in the power-law spectral decay of EIT with frequency, f^{-3}, independent of fluid rheology and flow parameters. 2021-12-14T13:07:03Z 2021-12-14T13:07:03Z 2021-08-13 2021-12-14T12:57:21Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/138470 Yamani, Sami, Keshavarz, Bavand, Raj, Yashasvi, Zaki, Tamer A, McKinley, Gareth H et al. 2021. "Spectral Universality of Elastoinertial Turbulence." Physical Review Letters, 127 (7). en 10.1103/physrevlett.127.074501 Physical Review Letters 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 | Yamani, Sami Keshavarz, Bavand Raj, Yashasvi Zaki, Tamer A McKinley, Gareth H Bischofberger, Irmgard Spectral Universality of Elastoinertial Turbulence |
| title | Spectral Universality of Elastoinertial Turbulence |
| title_full | Spectral Universality of Elastoinertial Turbulence |
| title_fullStr | Spectral Universality of Elastoinertial Turbulence |
| title_full_unstemmed | Spectral Universality of Elastoinertial Turbulence |
| title_short | Spectral Universality of Elastoinertial Turbulence |
| title_sort | spectral universality of elastoinertial turbulence |
| url | https://hdl.handle.net/1721.1/138470 |
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