Control of turbulence in boundary layers of superfluid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mi>He</mml:mi><mml:none /><mml:none /><mml:mprescripts /><mml:none /><mml:mn>4</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>by filtering out remanent vortices

Hashimoto, Nozomu; Goto, Risa; Yano, Hideo; Obara, K.; Ishikawa, Osamu; Hata, T.

doi:10.1103/physrevb.76.020504

Cited by 61 publications

(53 citation statements)

References 19 publications

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“…At relatively low temperatures the transition from laminar to turbulent response was accompanied by significant hysteresis. Subsequently, several groups have experimentally investigated the transition to turbulence in the superfluids 4 He and 3 He-B by using grids [49,50,51,52,53,54], wires [55,56,57,58,59], and tuning forks [60,61]. The details of the observations are described in a review article [47].…”

Section: Quantum Turbulence Created By Vibrating Structuresmentioning

confidence: 99%

Quantum hydrodynamics

Tsubota¹,

Kobayashi²,

Takeuchi³

2013

Physics Reports

153

178

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Quantum hydrodynamics in superfluid helium and atomic Bose-Einstein condensates (BECs) has been recently one of the most important topics in low temperature physics. In these systems, a macroscopic wave function (order parameter) appears because of Bose-Einstein condensation, which creates quantized vortices. Turbulence consisting of quantized vortices is called quantum turbulence (QT). The study of quantized vortices and QT has increased in intensity for two reasons. The first is that recent studies of QT are considerably advanced over older studies, which were chiefly limited to thermal counterflow in 4 He, which has no analogue with classical traditional turbulence, whereas new studies on QT are focused on a comparison between QT and classical turbulence. The second reason is the realization of atomic BECs in 1995, for which modern optical techniques enable the direct control and visualization of the condensate and can even change the interaction; such direct control is impossible in other quantum condensates like superfluid helium and superconductors. Our group has made many important theoretical and numerical contributions to the field of quantum hydrodynamics of both superfluid helium and atomic BECs. In this article, we review some of the important topics in detail. The topics of quantum hydrodynamics are diverse, so we have not attempted to cover all these topics in this article. We also ensure that the scope of this article does not overlap with our recent review article (arXiv:1004.5458), "Quantized vortices in superfluid helium and atomic Bose-Einstein condensates", and other review articles.

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Section: Quantum Turbulence Created By Vibrating Structuresmentioning

confidence: 99%

Quantum hydrodynamics

Tsubota¹,

Kobayashi²,

Takeuchi³

2013

Physics Reports

153

178

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“…The sphere was magnetically levitated in superfluid 4 He, and its response with respect to the alternating drive was observed. At low drives, the velocity response v was proportional to the drive F D , taking the ''laminar'' form Subsequently, several groups have experimentally investigated the transition to turbulence in superfluids 4 He and 3 He-B by using grids, 31,[69][70][71][72] wires, [73][74][75][76][77] and tuning forks. 78) The details of the observations are described in a review article.…”

Section: )mentioning

confidence: 99%

Quantum Turbulence

Tsubota

2008

J. Phys. Soc. Jpn.

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The present article reviews the recent developments in the physics of quantum turbulence. Quantum turbulence (QT) was discovered in superfluid 4 He in the 1950s, and the research has tended toward a new direction since the mid 90s. The similarities and differences between quantum and classical turbulence have become an important area of research. QT is comprised of quantized vortices that are definite topological defects, being expected to yield a model of turbulence that is much simpler than the classical model. The general introduction of the issue and a brief review on classical turbulence are followed by a description of the dynamics of quantized vortices. Then, we discuss the energy spectrum of QT at very low temperatures. At low wavenumbers, the energy is transferred through the Richardson cascade of quantized vortices, and the spectrum obeys the Kolmogorov law, which is the most important statistical law in turbulence; this classical region shows the similarity to conventional turbulence. At higher wavenumbers, the energy is transferred by the Kelvin-wave cascade on each vortex. This quantum regime depends strongly on the nature of each quantized vortex. The possible dissipation mechanism is discussed. Finally, important new experimental studies, which include investigations into temperaturedependent transition to QT, dissipation at very low temperatures, QT created by vibrating structures, and visualization of QT, are reviewed. The present article concludes with a brief look at QT in atomic BoseEinstein condensates.

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“…It is believed that remnant vortices are usually pinned to the roughness of the wall. 3 Indeed, Hashimoto et al 4 experimentally showed that quantum turbulence cannot be generated without remnant vortices.…”

Section: Introductionmentioning

confidence: 99%

“…To both create and detect quantum turbulence, objects oscillating in a superfluid, such as spheres, grids, thin wires, and tuning forks are often employed. 4,10,11,12,13,14,15,16 The most commonly measured physical quantity is the velocity of the oscillating objects. At temperatures lower than 1 K, the velocity exhibits the clear transition from laminar to turbulent state when the driving force is increased.…”

Section: Introductionmentioning

confidence: 99%

Drag force on an oscillating object in quantum turbulence

Fujiyama

Tsubota

2009

Phys. Rev. B

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This paper reports results of the computation of the drag force exerted on an oscillating object in quantum turbulence in superfluid 4 He. The drag force is calculated on the basis of numerical simulations of quantum turbulent flow about the object. The drag force is proportional to the square of the magnitude of the oscillation velocity, which is similar to that in classical turbulence at high Reynolds number. The drag coefficient is also calculated, and its value is found to be of the same order as that observed in previous experiments. The correspondence between quantum and classical turbulences is further clarified by examining the turbulence created by oscillating objects.

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Control of turbulence in boundary layers of superfluidHe4by filtering out remanent vortices

Cited by 61 publications

References 19 publications

Quantum hydrodynamics

Quantum hydrodynamics

Quantum Turbulence

Drag force on an oscillating object in quantum turbulence

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