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Quantifying Mixing using Magnetic Resonance Imaging
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Binary Mixtures in Linear Convection Arrays.

Pulak K Ghosh1, Yuxin Zhou2, Yunyun Li2

  • 1Department of Chemistry, Presidency University, Kolkata, 700073, India.

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|September 20, 2022
PubMed
Summary
This summary is machine-generated.

Active and passive disks in convection rolls show stirring and separation behaviors. Increasing active disk motility leads to clustering in stagnation zones, impacting diffusion dynamics.

Keywords:
Active particlesclusteringconvection rollsdiffusionphase-separation

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Area of Science:

  • Physics of complex systems
  • Fluid dynamics
  • Colloidal science

Background:

  • Active and passive particles exhibit distinct behaviors in fluid environments.
  • Convection rolls create complex flow patterns influencing particle dynamics.
  • Understanding particle mixtures is crucial for applications in microfluidics and materials science.

Purpose of the Study:

  • To numerically investigate the dynamics of mixed finite-size active and passive disks.
  • To explore the effects of advection and steric interactions on particle behavior.
  • To quantify the influence of active particle fraction and motility on mixture dynamics.

Main Methods:

  • Numerical simulations of active and passive disk mixtures.
  • Analysis of particle trajectories within a 2D convection roll array.
  • Calculation of diffusion constants for both active and passive particles.

Main Results:

  • A small fraction of slow active particles can stir passive colloidal fluids.
  • Increasing active particle motility causes separation of active and passive fractions.
  • Active particles cluster in stagnation areas along array walls with higher motility.

Conclusions:

  • The interplay between advection and steric forces governs mixture behavior.
  • Particle motility is a key parameter controlling segregation and clustering.
  • Diffusion constants are dependent on active particle fraction and motility, offering insights into transport phenomena.