Metastable Helium Molecules as Tracers in Superfluid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>4</mml:mn></mml:mmultiscripts></mml:math>

Guo, Wei; Wright, John D.; Cahn, S. B.; Nikkel, J.; McKinsey, D. N.

doi:10.1103/physrevlett.102.235301

Cited by 69 publications

(87 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study investigated a mean velocity profile in a superfluid boundary layer, motivated by numerical studies for spatially inhomogeneous thermal counterflow [74,75,78,91] and visualization experiments [35,93,94,95,96,97,98]. As a result, they found that the logarithmic velocity profile could appear in wall-bounded QT.…”

Section: Numerical Study In Quantum Turbulencementioning

confidence: 99%

Numerical Studies of Quantum Turbulence

2017

View full text Add to dashboard Cite

We review numerical studies of quantum turbulence. Quantum turbulence is currently one of the most important problems in low temperature physics and is actively studied for superfluid helium and atomic Bose-Einstein condensates. A key aspect of quantum turbulence is the dynamics of condensates and quantized vortices. The dynamics of quantized vortices in superfluid helium are described by the vortex filament model, while the dynamics of condensates are described by the Gross-Pitaevskii model. Both of these models are nonlinear, and the quantum turbulent states of interest are far from equilibrium. Hence, numerical studies have been indispensable for studying quantum turbulence. In fact, numerical studies have contributed in revealing the various problems of quantum turbulence. This article reviews the recent developments in numerical studies of quantum turbulence. We start with the motivation and the basics of quantum turbulence and invite readers to the frontier of this research. Though there are many important topics in the quantum turbulence of superfluid helium, this article focuses on inhomogeneous quantum turbulence in a channel, which has been motivated by recent visualization experiments. Atomic Bose-Einstein condensates are a modern issue in quantum turbulence, and this article reviews a variety of topics in the quantum turbulence of condensates e.g. two-dimensional quantum turbulence, weak wave turbulence, turbulence in a spinor condensate, etc., some of which has not been addressed in superfluid helium and paves the novel way for quantum turbulence researches. Finally we discuss open problems.

show abstract

Section: Numerical Study In Quantum Turbulencementioning

confidence: 99%

Numerical Studies of Quantum Turbulence

2017

View full text Add to dashboard Cite

show abstract

“…Specially targeted experiments in conjunction with theoretical analysis are needed in order to probe essential thermal superfluid physics. For this reason, the further development and application to turbulent flows of the tracking of metastable helium molecules as developed by Guo et al (2009) is highly desirable. By allowing the determination of the undisturbed normal-fluid velocity, this approach can boost thermal superfluid turbulence studies.…”

Section: Introductionmentioning

confidence: 99%

Spreading of superfluid vorticity clouds in normal-fluid turbulence

Kivotides

2010

J. Fluid Mech.

View full text Add to dashboard Cite

In this paper, we formulate a self-consistent model of thermal superfluid dynamics. By solving it, we analyse the problem of superfluid vorticity cloud propagation in normal-fluid turbulence. We show that superfluid cloud expansion is driven by pattern-forming superfluid vortex instabilities taking place in the interface layer between the cloud's bulk and the outer undisturbed normal-fluid turbulence. The radius of the cloud increases linearly with time. Mutual friction transfers energy from the normal-fluid turbulence to the superfluid cloud, whilst damping the smallest normal-fluid turbulence motions. This damping action is much weaker than viscous dissipation effects in a corresponding pure normal-fluid turbulence. The energy spectrum of superfluid turbulence presents the k −3 scaling that characterizes the spiral superfluid vorticity patterns of normal vortex tube-superfluid vortex interactions. The corresponding k −2 pressure spectrum signifies the singular nature of superfluid vorticity. These two scalings coincide in wavenumber space with the Kolmogorov regime in the normal-fluid turbulence. We compute a fractal dimension d f ≈ 1.652 for superfluid vorticity. Due to simpler underlying superfluid vortex dynamics in relation to the strongly nonlinear classical vortex dynamics, this fractal dimension is smaller than the corresponding dimension of vortex tube centrelines in classical turbulence.

show abstract

“…The numerous "islands" correspond to the normal-fluid vorticity around the superfluid rings, that is induced by the vortex-fluid couplings [13]. These normal-fluid vorticity "halos" around superfluid rings is a good method for their detection in experiments that can measure normal-fluid velocity fields [14].…”

mentioning

confidence: 99%

“…The "halos" correspond to normal-fluid flow induced by vortex couplings at the locations of superfluid vorticity. Modern experimental methods [14] that measure normal-fluid velocity fields can exploit these halos in order to detect superfluid rings in a non-invasive way. As fig.…”

mentioning

confidence: 99%

Interactions between normal-fluid and superfluid vortex rings in helium-4

Kivotides¹

2015

EPL

View full text Add to dashboard Cite

-By employing both vortex-dynamical and self-consistent Navier-Stokes methods of analysis, an investigation of interactions between normal-fluid and superfluid vortex rings in helium-4 is performed. It is shown that, under the influence of normal-fluid vortices, superfluid vortices grow in size in order to match the size of the latter. In turbulence, this mechanism hints to a tendency towards scale-to-scale energy equipartition in the spectral regimes corresponding to the inertial-range in the normal-fluid. Yet, the analysis shows that the induced superfluid vorticity is not trapped by the cores of the normal-fluid vortices, and, consequently, there is no strong correlation between normal-fluid and induced superfluid vorticity patterns. Hence, there is no significant vortex locking effect.

show abstract

Metastable Helium Molecules as Tracers in SuperfluidHe4

Cited by 69 publications

References 23 publications

Numerical Studies of Quantum Turbulence

Numerical Studies of Quantum Turbulence

Spreading of superfluid vorticity clouds in normal-fluid turbulence

Interactions between normal-fluid and superfluid vortex rings in helium-4

Contact Info

Product

Resources

About