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Area of Science:

  • Fluid Dynamics and Microfluidics
  • Soft Matter Physics
  • Computational Science

Background:

  • Self-alignment of macro-sized asymmetric objects is well-studied.
  • Investigating self-orientation at nano-scales presents significant technical challenges.
  • Understanding particle behavior in flow is crucial for microfluidic applications.

Purpose of the Study:

  • To investigate the self-orientation phenomenon of asymmetric particles across length scales from micron to nano.
  • To explore the influence of diffusion over convection on particle alignment.
  • To map out regimes of particle alignment based on flow conditions and particle shape.

Main Methods:

  • Combined molecular dynamics and stochastic rotation dynamics simulations.
  • Modeled an asymmetric dumbbell particle in Hele-Shaw flow.
  • Varied Péclet numbers (Pe) and particle shape (size ratio R[combining tilde]).

Main Results:

  • Identified three distinct regimes: strong, weak, and no alignment.
  • Developed a state diagram mapping alignment regimes in the Pe vs. R[combining tilde] plane.
  • Found characteristic reorientation time is a monotonically decreasing function of dumbbell anisotropy.

Conclusions:

  • The study provides insights into self-orientation mechanisms at micro and nano scales.
  • The findings enable estimation of experimental conditions for observing these phenomena.
  • Particle anisotropy significantly impacts reorientation dynamics in fluid flow.