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Methods for Measuring the Orientation and Rotation Rate of 3D-printed Particles in Turbulence
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Active particles with desired orientation flowing through a bottleneck.

Daniel R Parisi1, Raúl Cruz Hidalgo2, Iker Zuriguel2

  • 1Instituto Tecnológico de Buenos Aires, CONICET, Lavardén 315, 1437 C, A. de Buenos Aires, Argentina. dparisi@itba.edu.ar.

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|June 16, 2018
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Summary
This summary is machine-generated.

Anisotropic self-propelled particles flow differently through constrictions based on orientation. Longitudinal propulsion reduces flow rate due to stable clogging structures, unlike transversal propulsion.

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Area of Science:

  • Physics
  • Biophysics
  • Complex Systems

Background:

  • Anisotropic self-propelled particles exhibit complex behaviors in confined geometries.
  • Understanding flow dynamics is crucial for applications ranging from granular materials to biological systems.

Purpose of the Study:

  • To investigate the impact of particle orientation on the flowability of anisotropic self-propelled particles through constrictions.
  • To elucidate the mechanisms behind flow rate reduction and clogging.

Main Methods:

  • Extensive numerical simulations were performed.
  • The study analyzed the influence of particle propulsion direction (longitudinal vs. transversal) relative to their long axis.
  • Clogging structure stability was examined.

Main Results:

  • Longitudinal particle orientation significantly reduces flow rate compared to transversal orientation.
  • This reduction occurs even when the effective section for longitudinal propulsion is larger.
  • Stable clogging structures form preferentially with longitudinal orientation.

Conclusions:

  • Particle orientation is a critical factor governing flowability in constricted systems.
  • The formation of stable clogging structures explains the counterintuitive flow reduction in longitudinal propulsion.
  • Findings have implications for microbial populations, cellular flows, and collective animal movement.