Fluid Dynamics of Bacterial Turbulence

被引：444

作者：

Dunkel, Joern ^{[1
]}

Heidenreich, Sebastian ^{[2
]}

Drescher, Knut ^{[3
,4
]}

Wensink, Henricus H. ^{[5
,6
]}

Baer, Markus ^{[2
]}

Goldstein, Raymond E. ^{[1
]}

机构：

[1] Univ Cambridge, Ctr Math Sci, DAMTP, Cambridge CB3 0WA, England

[2] Phys Tech Bundesanstalt, D-10587 Berlin, Germany

[3] Princeton Univ, Dept Mol Biol, Princeton, NJ 08544 USA

[4] Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA

[5] Univ Paris 11, Phys Solides Lab, F-91405 Orsay, France

[6] CNRS, F-91405 Orsay, France

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 22期

基金：

欧洲研究理事会;

关键词：

HYDRODYNAMICS; FLUCTUATIONS; MECHANICS;

D O I：

10.1103/PhysRevLett.110.228102

中图分类号：

O4 [物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

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.

引用

页数：5

共 49 条

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