Fluid dynamics of bacterial turbulence

Dunkel, Jörn and Heidenreich, Sebastian and Drescher, Knut and Wensink, Henricus H. and Bär, Markus and Goldstein, Raymond E.. (2013) Fluid dynamics of bacterial turbulence. Physical Review Letters, 110 (22). p. 228102.

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Official URL: https://edoc.unibas.ch/83558/

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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.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Infection Biology > Microbiology and Biophysics (Drescher)
UniBasel Contributors:Drescher, Knut
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:23 Jun 2021 08:32
Deposited On:23 Jun 2021 08:32

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