Vortex mutual friction in superfluid3He

The formation and dynamics of topological defects of different structure has been of central interest in the study of the 3 He superfluids. Compared to superfluid 4 He-II, the variability of the important parameters with temperature and pressure is wider and many features are more ideal. This has made experimentally new approaches possible. An example is the formation of quantized vortices and other topological defects in a rapid time-dependent phase transition from the normal state to 3 He-B. This vortex formation process is known as the Kibble-Zurek mechanism and is one the central topics of this review. It demonstrates the use 3 He-B as a model system for quantum fields, with detailed control from the laboratory.PACS: 67.57. Fg, 47.32, 05.70.Fh, 98.80.Cq.

show abstract

“…This equation ) is compared to experimental data on mutual friction in 3 He-B (Bevan et al 1997a) in Fig. 37.…”

Section: Anomalous Force Acting On a Continuous Vortex And Baryogenesmentioning

confidence: 99%

Vortex formation and dynamics in superfluid 3He and analogies in quantum field theory

Eltsov

Krusius²,

Volovik

2005

Progress in Low Temperature Physics

View full text Add to dashboard Cite

show abstract

“…[2]. From the form of this equation we can expect that the solutions for v L can be classified by the parameter q =1 ÿ 0 .…”

mentioning

confidence: 97%

“…The transition occurs as a function of damping in vortex motion, the mutual friction dissipation, which increases roughly exponentially [2] with temperature. If a bundle of vortex loops is injected in applied flow, below 0:6T c they interact generating new loops in a rapidly growing tangle of vortices.…”

mentioning

confidence: 98%

Vortex Multiplication in Applied Flow: A Precursor to Superfluid Turbulence

Finne¹,

Eltsov²,

Eska³

et al. 2006

Phys. Rev. Lett.

View full text Add to dashboard Cite

A surface-mediated process is identified in 3He-B which generates vortices at a roughly constant rate. It precedes a faster form of turbulence where intervortex interactions dominate. This precursor becomes observable when vortex loops are introduced in low-velocity rotating flow at sufficiently low mutual friction dissipation at temperatures below 0.5Tc. Our measurements indicate that the formation of new loops is associated with a single vortex interacting in the applied flow with the sample boundary. Numerical calculations show that the single-vortex instability arises when a helical Kelvin wave expands from a reconnection kink at the wall and then intersects again with the wall.

show abstract

“…(Right) Characteristic spin-down and spin-up times given in terms of 0 ¼ 1=ð2Þ versus normalized inverse temperature T c =T: Our measurements of ðTÞ (filled triangles) are compared to 1=ð2Þ extrapolated from data on ðTÞ measured above 0:35T c in Ref. [11] (dashed line) and to the calculated spin down in the cylinder with ¼ 2 , which uses the mutual friction from Ref. [11] (open triangles).…”

mentioning

confidence: 99%

Stability and Dissipation of Laminar Vortex Flow in SuperfluidHe3−B

et al. 2010

View full text Add to dashboard Cite

A central question in the dynamics of vortex lines in superfluids is dissipation on approaching the zero temperature limit T→0. From both NMR measurements and vortex filament calculations, we find that vortex flow remains laminar up to large Reynolds numbers Re{α}∼10(3) in a cylinder filled with 3He-B. This is different from viscous fluids and superfluid 4He, where the corresponding responses are turbulent. In 3He-B, laminar vortex flow is possible in the bulk volume even in the presence of sizable perturbations from axial symmetry to below 0.2Tc. The laminar flow displays no excess dissipation beyond mutual friction, which vanishes in the T→0 limit, in contrast with turbulent vortex motion where dissipation has been earlier measured to approach a large T-independent value at T≲0.2Tc.

show abstract

Vortex mutual friction in superfluid3He

Cited by 49 publications

References 33 publications

Vortex formation and dynamics in superfluid 3He and analogies in quantum field theory

Vortex formation and dynamics in superfluid 3He and analogies in quantum field theory

Vortex Multiplication in Applied Flow: A Precursor to Superfluid Turbulence

Stability and Dissipation of Laminar Vortex Flow in SuperfluidHe3−B

Contact Info

Product

Resources

About