Controlling stability and transport of magnetic microswimmers by an external field
| Autor: | Sara Jabbari-Farouji, Fabian R. Koessel |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Physics::Biological Physics Hydrodynamic stability Steady state Statistical Mechanics (cond-mat.stat-mech) Field (physics) FOS: Physical sciences General Physics and Astronomy Pattern Formation and Solitons (nlin.PS) Mechanics Condensed Matter - Soft Condensed Matter Nonlinear Sciences - Pattern Formation and Solitons 01 natural sciences Instability 010305 fluids & plasmas Magnetic field Nonlinear system 0103 physical sciences Soft Condensed Matter (cond-mat.soft) Polar 010306 general physics Anisotropy Condensed Matter - Statistical Mechanics |
| Zdroj: | EPL (Europhysics Letters). 125:28001 |
| ISSN: | 1286-4854 |
| DOI: | 10.1209/0295-5075/125/28001 |
| Popis: | We investigate the hydrodynamic stability and transport of magnetic microswimmers in an external field using a kinetic theory framework. Combining linear stability analysis and nonlinear 3D continuum simulations, we show that for sufficiently large activity and magnetic field strengths, a homogeneous polar steady state is unstable for both puller and pusher swimmers. This instability is caused by the amplification of anisotropic hydrodynamic interactions due to the external alignment and leads to a partial depolarization and a reduction of the average transport speed of the swimmers in the field direction. Notably, at higher field strengths a reentrant hydrodynamic stability emerges where the homogeneous polar state becomes stable and a transport efficiency identical to that of active particles without hydrodynamic interactions is restored. |
| Databáze: | OpenAIRE |
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