| Zugriffsnummer | 29029 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Fluid dynamics of bacterial turbulence |
| Autor(in); Institution |
Dunkel, Jörn; University of Cambridge, Centre for Mathematical Sciences, DAMTP, Cambridge, United Kingdom
Heidenreich, Sebastian; 8.4, Mathematische Modellierung und Datenanalyse, PTB-Berlin
Drescher, K.; Departments of Molecular Biology and Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey, UNITED STATES OF AMERICA
Wensink, H. H.; Laboratoire de Physique des Solides, Université Paris-Sud, Orsay, FRANCE
Bär, Markus; 8.4, Mathematische Modellierung und Datenanalyse, PTB-Berlin
Goldstein, Raymond E.; DAMTP, Centre for Mathematical Sciences, University of Cambridge, Cambridge, UNITED KINGDOM
|
| Quelle/Jahr | Physical Review Letters: 110 (2013), 22, 5 pages |
| ISSN | 0031-9007 (PRINT) ; 1079-7114 (ONLINE) |
| DOI | |
| URL | |
| Verlag | American Physical Society |
| Klassifikationscode | PACS: 87.10.-e ; PACS: 87.10.Ed ; PACS: 87.18.Hf |
| Freie Schlagworte | active fluids ; turbulence ; minimal model |
| Zusammenfassung | Self-sustained turbulent structures have been observed in a wide range of living fluids, yet no quantitative theory exists to explain their properties. We report experiments on active turbulence in highly concentrated 3D suspensions of Bacillus subtilis and compare them with a minimal fourth-order vector-field theory for incompressible bacterial dynamics. Velocimetry of bacteria and surrounding fluid, determined by imaging cells and tracking colloidal tracers, yields consistent results for velocity statistics and correlations over 2 orders of magnitude in kinetic energy, revealing a decrease of fluid memory with increasing swimming activity and linear scaling between kinetic energy and enstrophy. The best-fit model allows for quantitative agreement with experimental data |
