Second Sound in Liquid Helium II

Lane, C. T.; Fairbank, H. A. T.; Fairbank, W. M.

doi:10.1103/physrev.71.600

Cited by 78 publications

(43 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Deviation from Fourier's law was observed in low temperature experiments [1,2,3,4,5]. These experiments were performed with uniform homogeneous test samples where phonon based kinetic theory is a suitable theoretical background [6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamical consistency of the dual-phase-lag heat conduction equation

Kovács

Ván

2017

Continuum Mech. Thermodyn.

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Thermodynamical consistency of the dual-phase-lag heat conduction equation

Kovács

Ván

2017

Continuum Mech. Thermodyn.

View full text Add to dashboard Cite

show abstract

“…2 the density ratio is strongly temperature dependent between 1.0 and 2.17 K. One can define the mass flow of He below the point to be j ¼ s v s þ n v n . As shown in [12,13], two types of heat transport can be derived in liquid He below the point: The First Sound, a pressure wave with velocity v FiSo , and the Second Sound, an entropy wave with velocity v SeSo .…”

Section: A Properties Of Liquid Hementioning

confidence: 99%

Response of an oscillating superleak transducer to a pointlike heat source

Quadt

Schröder

Uhrmacher

et al. 2012

Phys. Rev. ST Accel. Beams

View full text Add to dashboard Cite

A new technique of superconducting cavity diagnostics has been introduced by D. L. Hartill at Cornell University, Ithaca, New York. It uses oscillating superleak transducers (OST) which detect the heat transferred from a cavity's quench point via Second Sound through the superfluid He bath, needed to cool the superconducting cavity. The localization of the quench point is done by triangulation. The observed response of an OST is a nontrivial, but reproducible pattern of oscillations. A small helium evaporation cryostat was built which allows the investigation of the response of an OST in greater detail. The distance between a pointlike electrical heater and the OST can be varied. The OST can be mounted either parallel or perpendicular to the plate that houses the heat source. If the artificial quench point releases an amount of energy compatible to a real quench spot on a cavity's surface, the OST signal starts with a negative pulse, which is usually strong enough to allow automatic detection. Furthermore, the reflection of the Second Sound on the wall is observed. A reflection coefficient R ¼ 0:39 AE 0:05 of the glass wall is measured. This excludes a strong influence of multiple reflections in the complex OST response. Fourier analyses show three main frequencies, found in all OST spectra. They can be interpreted as modes of an oscillating circular membrane.

show abstract

“…The velocity of second sound ranges approximately between 0 and 40 m/s in the temperature and concentration range of our experiment. Largest values are obtained at low temperatures and at high concentrations, while near T λ it tends to zero, as second sound ceases to exist [9,[24][25][26][27]. Since the second sound velocity has a significant temperature and concentration dependence, there exist numerous possible standing sound wave modes that can be observed with a quartz tuning fork [28].…”

Section: B Quartz Tuning Forkmentioning

confidence: 99%

Decoupling of first sound from second sound in dilute He3–superfluidHe4 mixtures

2016

View full text Add to dashboard Cite

Riekki, Tapio; Manninen, M. S.; Tuoriniemi, Juha Decoupling of first sound from second sound in dilute 3He-superfluid 4He mixtures Bulk superfluid helium supports two sound modes: first sound is an ordinary pressure wave, while second sound is a temperature wave, unique to superfluid systems. These sound modes do not usually exist independently, but rather variations in pressure are accompanied by variations in temperature, and vice versa. We studied the coupling between first and second sound in dilute 3 He -superfluid 4 He mixtures, between 1.6 and 2.2 K, at 3 He concentrations ranging from 0% to 11%, under saturated vapor pressure, using a quartz tuning fork oscillator. Second sound coupled to first sound can create anomalies in the resonance response of the fork, which disappear only at very specific temperatures and concentrations, where two terms governing the coupling cancel each other, and second sound and first sound become decoupled.

show abstract

Second Sound in Liquid Helium II

Cited by 78 publications

References 1 publication

Thermodynamical consistency of the dual-phase-lag heat conduction equation

Thermodynamical consistency of the dual-phase-lag heat conduction equation

Response of an oscillating superleak transducer to a pointlike heat source

Decoupling of first sound from second sound in dilute He3–superfluidHe4 mixtures

Contact Info

Product

Resources

About