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Related Concept Videos

Couette Flow01:22

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Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
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Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
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Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
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Related Experiment Video

Updated: Feb 24, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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Superfluid flow above the critical velocity.

A Paris-Mandoki1,2,3, J Shearring1, F Mancarella4,5

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Researchers restored superfluidity above critical velocities using quantum interference resonances. This nonlinear effect, akin to the Ramsauer-Townsend effect, enhances critical values for superfluids and superconductors, with applications in quantum metrology.

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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Superfluidity and superconductivity exhibit frictionless motion and resistance-free current flow.
  • These properties are lost above critical thresholds like critical velocity or magnetic field.
  • Enhancing these critical values is crucial for fundamental understanding and practical applications.

Purpose of the Study:

  • To demonstrate the restoration of superfluidity above critical velocities.
  • To introduce a nonlinear phenomenon analogous to the Ramsauer-Townsend effect in quantum mechanics.
  • To explore the potential for enhancing critical values in superfluids and superconductors.

Main Methods:

  • Investigated quantum interference-induced resonances.
  • Performed thorough analysis in one-dimensional systems.
  • Proved the generality of the phenomenon in two-dimensional systems.

Main Results:

  • Superfluidity was restored at arbitrarily large flow velocities exceeding the critical velocity.
  • A nonlinear counterpart of the Ramsauer-Townsend effect was identified.
  • The phenomenon was shown to be robust in both 1D and 2D systems.

Conclusions:

  • Quantum interference can restore superfluidity beyond critical velocities.
  • This finding has significant implications for the fundamental understanding of superfluids and superconductors.
  • Opens new avenues for applications in quantum metrology, such as rotation sensing.