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Researchers developed novel chiral dipoles that exhibit preferential rotation in turbulent flows. These unique particles, fabricated via 3D printing, demonstrate predictable spinning behavior influenced by flow dynamics.

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Area of Science:

  • Fluid dynamics
  • Particle physics
  • Rheology

Background:

  • Understanding particle behavior in turbulent flows is crucial for various scientific and industrial applications.
  • Anisotropic particles can exhibit complex dynamics, including preferential rotation and alignment, in response to fluid stresses.

Purpose of the Study:

  • To introduce and characterize a new particle shape, the chiral dipole, designed to show preferential rotation in turbulence.
  • To investigate the relationship between particle shape, flow conditions, and rotational dynamics.

Main Methods:

  • Fabrication of chiral dipoles using 3D printing with dimensions in the inertial range.
  • Experimental tracking of particle rotations in a turbulent flow generated by oscillating grids.
  • Stokesian dynamics simulations of chiral dipoles in pure strain flow.
  • Development of a predictive model for chiral dipole spinning rates using direct numerical simulations.

Main Results:

  • High aspect ratio chiral dipoles align with extensional eigenvectors of the strain rate tensor.
  • Helical ends of chiral dipoles generate a non-zero mean spinning rate in response to extensional strain.
  • Simulations quantified the dependence of spinning on particle shape.
  • A predictive model accurately reproduced experimental spinning statistics for larger particles.

Conclusions:

  • Chiral dipoles exhibit unique rotational behaviors in turbulent flows.
  • The developed model provides a reliable method for predicting chiral dipole spinning.
  • This study offers insights into the dynamics of complex particles in turbulence.