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Fluctuation-Induced Interaction in Turbulent Flows.

M Davoodianidalik1, H Punzmann1, H Kellay2

  • 1Research School of Physics, The Australian National University, Canberra ACT 2601, Australia.

Physical Review Letters
|January 28, 2022
PubMed
Summary
This summary is machine-generated.

Researchers experimentally observed fluctuation-induced attraction forces in confined two-dimensional hydrodynamic turbulence. This force depends on wall separation and flow energy, with narrower gaps causing stronger attraction.

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Area of Science:

  • Physics
  • Fluid Dynamics
  • Turbulence Studies

Background:

  • Fluctuation-induced forces are known in various physical systems.
  • Experimental evidence for these forces in hydrodynamic turbulence was previously lacking.

Purpose of the Study:

  • To experimentally demonstrate and characterize fluctuation-induced forces in confined two-dimensional hydrodynamic turbulence.
  • To investigate the relationship between force, wall separation, and turbulent flow parameters.

Main Methods:

  • Utilizing two walls to locally confine two-dimensional (2D) turbulent flow.
  • Measuring the interaction force as a function of wall separation and energy injection rate.

Main Results:

  • Evidence of a long-range attraction force mediated by turbulent fluctuations was found.
  • The attraction force increases as wall separation decreases.
  • Confined flow becomes less energetic and more anisotropic with decreasing wall spacing, enhancing attraction.
  • A complex short-range interaction was observed in narrow cavities due to resonance.

Conclusions:

  • A novel fluid-wall coupling mechanism explains the force generation, where flow structures interact with cavity walls.
  • These findings extend the understanding of fluctuation-induced forces to hydrodynamic turbulence.
  • The results have potential applications in industrial multiphase flows and planetary formation modeling.