The Viscosity of Liquid Helium Ii Between 0.79° K and the Lambda Point

Woods, A. D. B.; Hallett, A. C. Hollis

doi:10.1139/p63-062

Cited by 87 publications

(18 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that for the temperature range generally studied in helium II experiments, ν S is of similar order or larger than the normal component's kinematic viscosity, ν N = η/ρ N . 60 Combining the momentum conservation equations (26) and (27) with the extended version of the mutual friction (29) and the tension force (30), one finally arrives at the HVBK equations that describe the hydrodynamics of a rotating twocomponent superfluid in the presence of averaged vorticity, 35,57,59…”

Section: Mutual Friction and Hvbk Equationsmentioning

confidence: 99%

Neutron stars in the laboratory

Graber

Andersson

Hogg

2017

Int. J. Mod. Phys. D

View full text Add to dashboard Cite

Neutron stars are astrophysical laboratories of many extremes of physics. Their rich phenomenology provides insights into the state and composition of matter at densities which cannot be reached in terrestrial experiments. Since the core of a mature neutron star is expected to be dominated by superfluid and superconducting components, observations also probe the dynamics of large-scale quantum condensates. The testing and understanding of the relevant theory tends to focus on the interface between the astrophysics phenomenology and nuclear physics. The connections with low-temperature experiments tend to be ignored. However, there has been dramatic progress in understanding laboratory condensates (from the different phases of superfluid helium to the entire range of superconductors and cold atom condensates). In this review, we provide an overview of these developments, compare and contrast the mathematical descriptions of laboratory condensates and neutron stars and summarise the current experimental state-of-the-art. This discussion suggests novel ways that we may make progress in understanding neutron star physics using low-temperature laboratory experiments.

show abstract

Section: Mutual Friction and Hvbk Equationsmentioning

confidence: 99%

Neutron stars in the laboratory

Graber

Andersson

Hogg

2017

Int. J. Mod. Phys. D

View full text Add to dashboard Cite

show abstract

“…Below T c , the behavior of the shear viscosity of bosonic and fermionic fluids is quite different. In bosonic 4 He [2], there is an increase in the shear viscosity as the temperature decreases below T c , which is believed to arise from single particle bosonic excitations that couple to the collective (NambuGoldstone) modes [3,4]. In fermionic 3 He [5], the shear viscosity decreases rapidly to zero as the temperature decreases below T c , most likely as a result of the suppression of fermionic excitations at low temperatures [4].…”

mentioning

confidence: 99%

Shear Viscosity of a Unitary Fermi Gas Near the Superfluid Phase Transition

Joseph¹,

Elliott²,

Thomas³

2015

Phys. Rev. Lett.

View full text Add to dashboard Cite

We measure the shear viscosity for a resonantly interacting Fermi gas as a function of temperature from nearly the ground state through the superfluid phase transition into the high temperature regime. Further, we demonstrate an iterative method to estimate the local shear viscosity coefficient α(S)(θ) versus reduced temperature θ from the cloud-averaged measurements ⟨α(S)⟩, and compare α(S) to several microscopic theories. We find that α(S) reveals features that were previously hidden in ⟨α(S)⟩.

show abstract

“…The entries draw on information published electronically by Donnelly [49]. Historically, viscosity measurements have been attempted with rotating cylinders [50,51], damped fine-wire vibration [52,53], torsional quartz crystals [54], and torsional oscillators [55]. The rotating cylinder viscometer measures the shear viscosity η directly, whereas the other methods measure the kinematic viscosity η/ρ n , so that ρ n must be independently measured to extract η.…”

Section: Helium IImentioning

confidence: 99%

Interpreting Superfluid Spin Up Through the Response of the Container

Eysden

Melatos

2011

J Low Temp Phys

View full text Add to dashboard Cite

A recipe is presented for interpreting non-invasively the transport processes at work during relaxation of a cylindrical, superfluid-filled vessel, after it is accelerated impulsively and then allowed to respond to the viscous torque exerted by the contained fluid. The recipe exploits a recently published analytic solution for Ekman pumping in a two-component superfluid, which treats the back-reaction self-consistently in arbitrary geometry for the first time. The applicability of the recipe to He II, 3 He, 3 He-4 He mixtures and Bose-Einstein condensates is assessed, and the effects of turbulence discussed.

show abstract

The Viscosity of Liquid Helium Ii Between 0.79° K and the Lambda Point

Cited by 87 publications

References 5 publications

Neutron stars in the laboratory

Neutron stars in the laboratory

Shear Viscosity of a Unitary Fermi Gas Near the Superfluid Phase Transition

Interpreting Superfluid Spin Up Through the Response of the Container

Contact Info

Product

Resources

About