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Hydrodynamic instabilities in driven chiral suspensions.

Seema Chahal1, Brato Chakrabarti1

  • 1Tata Institute of Fundamental Research, International Centre for Theoretical Sciences, Bengaluru 560089, India.

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Summary
This summary is machine-generated.

Active chiral particle suspensions exhibit novel chaotic dynamics driven by self-propulsion and torque. This differs from conventional dipolar stresses, revealing a new route to pattern formation in active matter.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Fluid Dynamics

Background:

  • Active Stokesian suspensions typically generate dipolar stresses, leading to chaotic flows and destabilizing aligned states.
  • Understanding collective dynamics in active matter is crucial for developing novel materials and technologies.

Purpose of the Study:

  • To investigate the distinct collective dynamics of torque-driven spinning chiral particles.
  • To identify a novel route to chaotic flows and pattern formation in active suspensions.

Main Methods:

  • Mean-field kinetic theory
  • Stability analysis
  • Nonlinear simulations

Main Results:

  • Torque monopoles and microscopic chirality drive chaotic flows in three dimensions.
  • The dynamics are intrinsically linked to self-propulsion and the coupling between nematic and polar order.
  • A novel route to collective dynamics distinct from dipolar instabilities was discovered.

Conclusions:

  • The study reveals a new mechanism for chaotic flow generation in active chiral suspensions.
  • Findings suggest strategies for designing torque-driven active materials.
  • Provides a framework for understanding the rheology of chiral fluids.