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Anisotropic Diffusion in Driven Convection Arrays.

Yunyun Li1, Vyacheslav R Misko1,2, Fabio Marchesoni1,3

  • 1Center for Phononics and Thermal Energy Science, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.

Entropy (Basel, Switzerland)
|April 3, 2021
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Summary
This summary is machine-generated.

We numerically investigated Brownian colloidal particle transport in convection rolls. External forces dramatically altered diffusion but not particle mobility, revealing nonlinear system responses due to fluid flow advection.

Keywords:
advection enhanced diffusionbrownian motionclassical transportconvection rolls

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Area of Science:

  • Fluid dynamics
  • Colloidal science
  • Statistical mechanics

Background:

  • Brownian colloidal particles are fundamental in soft matter physics.
  • Understanding particle transport in complex fluid flows is crucial for various applications.
  • High Péclet number regimes present unique challenges for theoretical and numerical analysis.

Purpose of the Study:

  • To numerically investigate the transport of a Brownian colloidal particle.
  • To analyze the effects of external forces on particle diffusion and mobility.
  • To understand the relationship between nonlinear transport phenomena and fluid advection properties.

Main Methods:

  • Numerical simulations were employed to model particle behavior.
  • The study focused on a square array of planar counter-rotating convection rolls.
  • High Péclet numbers were used to represent specific flow conditions.

Main Results:

  • External forces induced significant, force-dependent peaks in the particle's diffusion constant.
  • In stark contrast, particle mobility remained isotropic and independent of the applied force.
  • A nonlinear response of the system was observed, linked to laminar flow advection.

Conclusions:

  • The study highlights a significant disparity between diffusion and mobility responses to external forces.
  • Advection properties of laminar flow are identified as the key factor driving the observed nonlinear transport.
  • These findings offer insights into the complex dynamics of colloidal particles in structured fluid flows.