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Toy model for vortex-ring-assisted particle drag in superfluid counterflow.
1Instituto de Física, Universidade Federal do Rio de Janeiro, C.P. 68528, CEP: 21945-970, Rio de Janeiro, RJ, Brazil.
Physical Review. E
|November 28, 2019
Summary
This study models vortex ring-particle (VRP) states in superfluid flows. The simplified model explains how viscous dissipation, Magnus force, and vortex rings influence VRP dynamics and stability.
Area of Science:
- Fluid dynamics
- Superfluidity
- Quantum turbulence
Background:
- Particle tracking velocimetry in superfluid flows is challenging.
- Tracking particles aggregate near quantized vortices, influencing their dynamics.
- Vortex ring-particle (VRP) states are hypothesized bound states.
Purpose of the Study:
- To introduce a simplified 2D model for VRP states.
- To capture essential features of 3D VRP counterparts.
- To elucidate the mechanisms governing VRP stability and dynamics.
Main Methods:
- Development of a simplified two-dimensional model for VRP states.
- Analysis of known experimental and numerical observations.
- Investigation of factors influencing VRP dynamics.
Main Results:
- The 2D model captures key qualitative features of 3D VRP states.
- Viscous dissipation significantly impacts VRP stability.
- Magnus force and vortex ring topology are crucial for VRP dynamics.
Conclusions:
- The simplified VRP model offers heuristic insights.
- Viscous dissipation, Magnus force, and vortex rings play vital roles in VRP states.
- Further understanding of superfluid flow dynamics through VRP analysis.
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