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The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress
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Enhancing rotational diffusion using oscillatory shear.

Brian D Leahy1, Xiang Cheng, Desmond C Ong

  • 1Department of Physics, Cornell University, Ithaca, New York 14853, USA.

Physical Review Letters
|June 18, 2013
PubMed
Summary
This summary is machine-generated.

Shear-induced Taylor dispersion enhances particle movement. This study reveals that rotational diffusion also increases for anisotropic particles in oscillatory shear, offering new control over colloids.

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Last Updated: May 10, 2026

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Published on: October 31, 2016

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Area of Science:

  • Colloid science
  • Fluid dynamics
  • Statistical mechanics

Background:

  • Taylor dispersion describes shear-enhanced translational diffusion, crucial in fields like pharmacology and geology.
  • Understanding particle dynamics in complex fluids is essential for material science and engineering.

Purpose of the Study:

  • To investigate the effect of oscillatory shear on the rotational diffusion of anisotropic particles.
  • To determine if rotational diffusion, similar to translational diffusion, is enhanced under shear.
  • To explore the distinct mechanisms and dependencies of shear-enhanced rotational diffusion.

Main Methods:

  • Experimental studies involving anisotropic particles in fluid.
  • Computational simulations to model particle behavior under shear.
  • Analysis of particle trajectories and rotational dynamics (Jeffery orbits).

Main Results:

  • Rotational diffusion of anisotropic particles is significantly enhanced in oscillatory shear.
  • This enhancement is dependent on strain amplitude, shear rate, and particle aspect ratio.
  • The behavior of enhanced rotational diffusion is distinct from that of translational diffusion.

Conclusions:

  • Oscillatory shear uniquely enhances both translational and rotational diffusion of anisotropic particles.
  • Separate tunability of translational and rotational diffusion is demonstrated.
  • New methods for controlling the position and orientation of suspended anisotropic colloids are proposed.