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Flagellated microswimmers: Hydrodynamics in thin liquid films.

Daniela Pimponi1, Mauro Chinappi2, Paolo Gualtieri3

  • 1Dipartimento di Ingegneria Meccanica e Aerospaziale, Sapienza Università di Roma, via Eudossiana 18, 00184, Roma, Italy.

The European Physical Journal. E, Soft Matter
|March 1, 2018
PubMed
Summary

This study explores microswimmer hydrodynamics in thin films, revealing curved paths influenced by confinement. Microswimmers show a bias towards the air-liquid interface, impacting their trajectories.

Keywords:
Topical issue: Fluids and Structures: Multi-scale coupling and modeling

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Area of Science:

  • Fluid dynamics
  • Microhydrodynamics
  • Biophysics

Background:

  • Microswimmers are crucial in microfluidics and biological systems.
  • Understanding their behavior in confined environments like thin films is essential.
  • Previous studies often simplify the complex hydrodynamics involved.

Purpose of the Study:

  • To investigate the hydrodynamics of a flagellated microswimmer confined to thin films.
  • To analyze the effect of solid and air-liquid interfaces on microswimmer trajectories.
  • To explore the rich dynamics and potential applications in microfluidic systems.

Main Methods:

  • Solving Stokes equations for fully resolved microswimmer hydrodynamics.
  • Simulating swimmer motion between a solid wall and an air-liquid interface.
  • Analyzing trajectory dynamics under varying geometric and film thickness conditions.

Main Results:

  • Microswimmers exhibit curved, clockwise trajectories.
  • A bias towards the air-liquid interface was observed.
  • Dynamics are highly sensitive to swimmer geometry and film thickness, leading to diverse paths including "crown-like" trajectories.
  • Stable circular paths and interface collisions were identified.

Conclusions:

  • Confinement in thin films leads to complex and sensitive microswimmer dynamics.
  • The air-liquid interface plays a significant role in dictating microswimmer behavior.
  • Findings have implications for understanding bacterial motion near air bubbles in microchannels.