Dynamics of turbulent plugs in a superfluid 
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 channel counterflow

Pomyalov, Anna

doi:10.1103/physrevb.101.134515

Cited by 5 publications

(3 citation statements)

References 56 publications

(127 reference statements)

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“…The bundle in the steady state is energetically sustained by the normal fluid; thus, when the rotor is stopped, the normal flow slows down, and the bundle diffuses. The diffusion constant D of a homogeneous vortex tangle is reported to be of the order of the circulation quantum number κ = h/m [36][37][38]. However, in our case, the bundle is assumed to possess an ordered structure; this would allow the system to have a structure-dependent diffusion constant, which is an experimentally measurable quantity.…”

Section: Estimation Of Diffusion Timescalementioning

confidence: 90%

Bathtub vortex in superfluid He4

2020

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We have investigated the structure of macroscopic suction flows in superfluid 4 He. In this study, we primarily analyze the structure of the quantized vortex bundle that appears to play an important role in such systems. Our study is motivated by a series of recent experiments conducted by a research group at Osaka City University [Yano et al., J. Phys.: Conf. Ser. 969, 012002 (2018)]; they created a suction vortex using a rotor in superfluid 4 He. They also reported that up to 10 4 quantized vortices accumulated in the central region of the rotating flow. The quantized vortices in such macroscopic flows are assumed to form a bundle structure; however, the mechanism has not yet been fully investigated. Therefore, we prescribe a macroscopic suction flow to the normal fluid and discuss the evolution of a giant vortex (i.e., one with a circulation quantum number exceeding unity) and a bundle of singly quantized vortices from a small number of seed vortices. Then, using numerical simulations, we discuss several possible characteristic structures of the bundle in such a flow, and we suggest that the actual steady-state bundle structure in the experiment can be verified by measuring the diffusion constant of the vortex bundle after the macroscopic normal flow has been switched off. By applying extensive knowledge of the superfluid 4 He system, we elucidate a type of macroscopic superfluid flow and identify a structure of quantized vortices.

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Section: Estimation Of Diffusion Timescalementioning

confidence: 90%

Bathtub vortex in superfluid He4

2020

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“…For instance, an important topic in QT research is counterflow turbulence where the mutual friction exists at all length scales 48 , 49 . Our knowledge on the vortex-tangle properties 14 , 19 , disturbances in the normal fluid 18 , 50 , and the effect of the mutual friction on the mean-velocity profile 23 , 51 , 52 may subject to change with future S2W-model simulations.…”

Section: Discussionmentioning

confidence: 99%

Imaging quantized vortex rings in superfluid helium to evaluate quantum dissipation

et al. 2023

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The motion of quantized vortices is responsible for many intriguing phenomena in diverse quantum-fluid systems. Having a theoretical model to reliably predict the vortex motion therefore promises a broad significance. But a grand challenge in developing such a model is to evaluate the dissipative force caused by thermal quasiparticles in the quantum fluids scattering off the vortex cores. Various models have been proposed, but it remains unclear which model describes reality due to the lack of comparative experimental data. Here we report a visualization study of quantized vortex rings propagating in superfluid helium. By examining how the vortex rings spontaneously decay, we provide decisive data to identify the model that best reproduces observations. This study helps to eliminate ambiguities about the dissipative force acting on vortices, which could have implications for research in various quantum-fluid systems that also involve similar forces, such as superfluid neutron stars and gravity-mapped holographic superfluids.

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“…The bundle in the steady state is energetically sustained by the normal fluid; thus, when the rotor is stopped, the normal flow slows down and the bundle diffuses. The diffusion constant D of a homogeneous vortex tangle is reported to be of the order of the circulation quantum number κ = h/m [41][42][43]. However, in our case, the bundle is assumed to possess an ordered structure; this would allow the system to have a structuredependent diffusion constant, which is an experimentally measurable quantity.…”

Section: Estimation Of Diffusion Time Scalementioning

confidence: 90%

Bathtub vortex in superfluid $^4$He

Inui,

Nakagawa,

Tsubota

2020

Preprint

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Dynamics of turbulent plugs in a superfluid He4 channel counterflow

Cited by 5 publications

References 56 publications

Bathtub vortex in superfluid He4

Bathtub vortex in superfluid He4

Imaging quantized vortex rings in superfluid helium to evaluate quantum dissipation

Bathtub vortex in superfluid $^4$He

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