Scaling regimes of active turbulence with external dissipation
| العنوان: | Scaling regimes of active turbulence with external dissipation |
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| المؤلفون: | Ramin Golestanian, Berta Martínez-Prat, Francesc Sagués, Fanlong Meng, Jean-François Joanny, Ricard Alert, Jordi Ignés-Mullol, Jaume Casademunt |
| المصدر: | Physical Review X, Vol 11, Iss 3, p 031065 (2021) Dipòsit Digital de la UB Universidad de Barcelona |
| بيانات النشر: | arXiv, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Physics, Turbulence, QC1-999, General Physics and Astronomy, Matèria condensada tova, FOS: Physical sciences, Mechanics, Dissipation, Soft condensed matter, Condensed Matter - Soft Condensed Matter, 01 natural sciences, 010305 fluids & plasmas, Physics::Fluid Dynamics, Biological Physics (physics.bio-ph), 0103 physical sciences, Energy spectrum, Soft Condensed Matter (cond-mat.soft), Physics - Biological Physics, 010306 general physics, Scaling, Turbulència |
| الوصف: | Active fluids exhibit complex turbulentlike flows at low Reynolds number. Recent work predicted that 2D active nematic turbulence follows scaling laws with universal exponents. However, experimentally testing these predictions is conditioned by the coupling to the 3D environment. Here, we measure the spectrum of the kinetic energy E(q) in an active nematic film in contact with a passive oil layer. At small and intermediate scales, we find the scaling regimes E(q)∼q^{-4} and E(q)∼q^{-1}, respectively, in agreement with the theoretical prediction for 2D active nematics. At large scales, however, we find a new scaling E(q)∼q, which emerges when the dissipation is dominated by the 3D oil layer. In addition, we derive an explicit expression for the spectrum that spans all length scales, thus explaining and connecting the different scaling regimes. This allows us to fit the data and extract the length scale that controls the crossover to the new large-scale regime, which we tune by varying the oil viscosity. Overall, our work experimentally demonstrates the emergence of scaling laws with universal exponents in active turbulence, and it establishes how the spectrum is affected by external dissipation. |
| وصف الملف: | application/pdf |
| DOI: | 10.48550/arxiv.2101.11570 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::08a1aa035978f71f9c8c271e4fc626f5 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....08a1aa035978f71f9c8c271e4fc626f5 |
| قاعدة البيانات: | OpenAIRE |
| DOI: | 10.48550/arxiv.2101.11570 |
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