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Channel instability in binary mixtures with differential diffusivity.

Michael T Ramirez1, Marciel C Gomes1, José S Andrade1

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This study reveals a novel instability in 2D binary fluid mixtures, distinct from the Plateau-Rayleigh instability. Differential diffusion drives rupture dynamics, offering new insights into active matter systems.

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Area of Science:

  • Fluid Dynamics
  • Active Matter Physics
  • Non-equilibrium Statistical Mechanics

Background:

  • Rupture dynamics and pinch-off are critical phenomena in fluid dynamics and biological systems.
  • Instabilities in fluid systems are often studied using models like the Plateau-Rayleigh instability (PRI).
  • PRI is a known phenomenon but is limited to three-dimensional systems.

Purpose of the Study:

  • To investigate the rupture dynamics and pinch-off phenomena in two-dimensional channel-like configurations of binary particle mixtures.
  • To identify key parameters influencing the stability of these systems.
  • To explore the fundamental mechanisms behind observed instabilities in 2D non-equilibrium systems.

Main Methods:

  • Computational simulations were employed to model the system.
  • The study analyzed the evolution of instability under various conditions.
  • Key parameters like aspect ratio, particle density, and drift strength were systematically varied.

Main Results:

  • A novel instability mechanism was identified in two-dimensional systems with differential diffusivities.
  • The observed instability differs fundamentally from the Plateau-Rayleigh instability.
  • The phenomenon was confirmed to be an intrinsic property, not a finite-size effect.

Conclusions:

  • The study elucidates a new instability in 2D active matter systems driven by differential diffusion.
  • This finding provides a deeper understanding of pattern formation and rupture dynamics in non-equilibrium systems.
  • The results suggest potential parallels with instabilities observed in chiral fluids.