Reconnection of Superfluid Vortex Bundles

Alamri, Sultan Z.; Youd, Anthony J.; Barenghi, Carlo F.

doi:10.1103/physrevlett.101.215302

Cited by 51 publications

(54 citation statements)

References 36 publications

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“…It is not clear whether a single isolated vortex can be responsible for the build-up of a rope, or whether this process involves a large group of interacting vortices. In fact, numerical studies of superfluid turbulence [26] predict existence of the vortex tangles with structures that strongly resemble the ropes reported here (Fig. 7b).…”

Section: Discussionmentioning

confidence: 80%

Formation of Metallic Nanowires by Laser Ablation in Liquid Helium

et al. 2011

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Laser ablation of metals in liquid helium results in the formation of metal filaments with diameters on the order of 2-10 nanometres and of spherical nanoparticles. In superfluid helium these nanowires aggregate into centimeter-sized networks. We study the morphology and the electric conductivity of these large aggregates, as well as extinction spectra and the crystalline structure of the individual nanofragments. We discuss the effect of superfluidity on the mechanisms of coalescence processes at the nanometer and centimeter scales.

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Section: Discussionmentioning

confidence: 80%

Formation of Metallic Nanowires by Laser Ablation in Liquid Helium

et al. 2011

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“…On the hand, a quantized vortex is a stable and definite topological defect, so investigating QT may connect the cascade process in the real and wavenumber spaces. Actually, some numerical works of the VF [171,172] and GP [173] models found the bundle-like structure of quantized vortices, which is thought to be indispensable for the cascade process in CT.…”

Section: Energy Spectrum and Cascadementioning

confidence: 99%

Numerical Studies of Quantum Turbulence

2017

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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.

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“…A suitable diagnostic for the length is obtained by counting the number of boxes where ρ < ρ c ≈ 0, giving a volume, then dividing by the core cross-section for a p = 1 profile. Similar algorithms have been used before [2,17,22] and shown both the growth and decay of vortex lines. Using ρ c = 0.1, Fig.…”

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confidence: 99%

Vortex Stretching as a Mechanism for Quantum Kinetic Energy Decay

Kerr

2011

Phys. Rev. Lett.

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A pair of perturbed anti-parallel quantum vortices, simulated using the three-dimensional GrossPitaevskii equations, is shown to be unstable to vortex stretching. This results in kinetic energy K ∇ψ being converted into interaction energy EI and eventually local kinetic energy depletion that is similar to energy decay in a classical fluid, even though the governing equations are Hamiltonian and energy conserving. The intermediate stages include: the generation of vortex waves, their deepening, multiple reconnections, the emission of vortex rings and phonons and the creation of an approximately -5/3 kinetic energy spectrum at high wavenumbers. All the wave generation and reconnection steps follow from interactions between the two original vortices, unlike the selfinteractions in vortex wave models. A four vortex example is given to demonstrate that some of these steps might be general. . These results imply that the effect could be a property of the ideal, inviscid equations for a pure superfluid or quantum gas, so that coupling to the viscous normal fluid component is not required to get decay.

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Reconnection of Superfluid Vortex Bundles

Cited by 51 publications

References 36 publications

Formation of Metallic Nanowires by Laser Ablation in Liquid Helium

Formation of Metallic Nanowires by Laser Ablation in Liquid Helium

Numerical Studies of Quantum Turbulence

Vortex Stretching as a Mechanism for Quantum Kinetic Energy Decay

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