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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confinement-Induced Self-Pumping in 3D Active Fluids.

Minu Varghese1, Arvind Baskaran1, Michael F Hagan1

  • 1Martin Fisher School of Physics, Brandeis University, Waltham, Massachusetts 02453, USA.

Physical Review Letters
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Summary
This summary is machine-generated.

In 3D active fluids, increasing confinement height relative to width shifts flow from turbulent to coherent. This study explains this phenomenon, offering design principles for self-pumping fluids.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Soft Matter

Background:

  • Two-dimensional active fluids transition to coherent flow with decreasing confinement.
  • Three-dimensional active fluids exhibit a counterintuitive transition from turbulence to coherence with increasing confinement height.

Purpose of the Study:

  • To theoretically explain the transition from turbulent to coherent flow in 3D active fluids.
  • To identify design principles for self-pumping 3D active fluids.

Main Methods:

  • Hydrodynamic model of rodlike units suspension.
  • Extensive numerical simulations.
  • Theoretical analysis of confinement aspect ratio.

Main Results:

  • Identified a mechanism explaining the turbulence-to-coherence transition in 3D confinement.
  • Mapped conditions favoring coherent flows.
  • Demonstrated the critical role of channel aspect ratio.

Conclusions:

  • The identified mechanism is general across various symmetries and propulsion types.
  • Provides unified design principles for 3D active fluid systems.
  • Offers insights into controlling active fluid behavior in confined geometries.