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Hydrodynamics of random-organizing hyperuniform fluids.

Qun-Li Lei1, Ran Ni2

  • 1School of Chemical and Biomedical Engineering, Nanyang Technological University, 637459 Singapore.

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|November 1, 2019
PubMed
Summary
This summary is machine-generated.

Researchers uncovered the physics behind exotic hyperuniform fluids. A new driven-dissipative hard-sphere model shows fluidic hyperuniformity (HU) arises from damping and active driving, suppressing density fluctuations.

Keywords:
Navier–Stokes equationsabsorbing-phase transitionactive spinnersfluidic hyperuniformitynonequilibrium fluids

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Area of Science:

  • Complex Systems
  • Statistical Physics
  • Soft Matter Physics

Background:

  • Disordered hyperuniform structures exhibit local randomness and large-scale uniformity.
  • A novel hyperuniform fluid state has been observed in nonequilibrium systems, but its underlying physics is not understood.

Purpose of the Study:

  • To elucidate the general mechanism governing fluidic hyperuniformity (HU) in nonequilibrium systems.
  • To propose and analyze a driven-dissipative hard-sphere model that exhibits fluidic HU.

Main Methods:

  • Formulation of a hydrodynamic theory based on Navier-Stokes equations.
  • Investigation of a nonequilibrium hard-sphere model with varying dissipation strength.
  • Analysis of the absorbing-phase transition and density fluctuations in q space.

Main Results:

  • The model system transitions from an absorbing state to an active hyperuniform fluid and then to an equilibrium fluid with increasing dissipation.
  • Fluidic HU is linked to the damped harmonic oscillator behavior in q space, suppressing long-wavelength density fluctuations.
  • Key ingredients for fluidic HU are identified as damping dissipation and active reciprocal interaction (driving).

Conclusions:

  • The study provides a theoretical framework for understanding fluidic hyperuniformity.
  • The findings suggest that damping and driving are essential for achieving HU in fluids.
  • The research demonstrates a pathway for realizing fluidic HU in experimental systems like active spinners.