Heat transport through helium II

Arp, V.

doi:10.1016/0011-2275(70)90078-0

Cited by 54 publications

(24 citation statements)

References 34 publications

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“…The largest gradient (∼ 6×10 −4 K/cm) was observed at the lowest temperatures and the smallest one (∼ 1×10 −4 K/cm ) at temperatures close to T λ . This result is in qualitative agreement with the expected behavior for the temperature gradient in the case of a small heat flux [31]. We estimated the heat flux from the measurements of the volume of evaporated helium dur-ing the warming of liquid helium from 1.3 to 2.165 K and cooling back.…”

supporting

confidence: 86%

Quantum vortices and thermally induced luminescence of nitrogen nanoclusters immersed in liquid helium

et al. 2017

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supporting

confidence: 86%

Quantum vortices and thermally induced luminescence of nitrogen nanoclusters immersed in liquid helium

et al. 2017

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“…The transition between He-II laminar and turbulent regime does not occur all at once but through an intermediate region delimited by the critical heat fluxes Q c1 and Q c2 [10]. Q c1 corresponds to the onset of vorticity in the superfluid component, whereas Q c2 to the development of normal component turbulence.…”

Section: Critical Heat Flux Identifying the End Of The Landau Regime mentioning

confidence: 99%

“…Nevertheless, the heat transport through μ-channels in He IIp was not much investigated: few papers report results for cooling channels of several mm [7][8], and to our knowledge the only work investigating channels of hydraulic diameter smaller than 1 mm was [9], down to 56 μm. On the other hand, extensive studies can be found in literature [10] on μ-channels in saturated He II (He IIs).…”

Section: Introductionmentioning

confidence: 99%

Steady-State heat transfer through micro-channels in pressurized He II

Granieri¹,

Baudouy²,

Four³

et al. 2012

AIP Conference Proceedings

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The operation of the Large Hadron Collider superconducting magnets for current and high luminosity future applications relies on the cooling provided by helium-permeable cable insulations. These insulations take advantage of a He II micro-channels network constituting an extremely efficient path for heat extraction. In order to provide a fundamental understanding of the underlying thermal mechanisms, an experimental setup was built to investigate heat transport through single He II channels typical of the superconducting cable insulation network, where deviation from the macro-scale theory can appear. Micro-fabrication techniques were exploited to etch the channels down to a depth of ~ 16 μm. The heat transport properties were measured in static pressurized He II and analyzed in terms of the laminar and turbulent He II laws, as well as in terms of the critical heat flux between the two regions.

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“…Thanks to the very high thermal conductivity of helium, superfluid conduction path is characterized by very low thermal impedance. However heat transport through superfluid helium channels is limited by the lambda transition (He II turns into He I) at the channel inlet [8]: the much poorer thermal conductivity of He I causes in fact a drastic reduction of heat transport through the channel that is thus considered saturated.…”

Section: Heat Transfer Modelmentioning

confidence: 99%

Cable Insulation Scheme to Improve Heat Transfer to Superfluid Helium in Nb-Ti Accelerator Magnets

China

Tommasini

2008

IEEE Trans. Appl. Supercond.

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Abstract-In superconducting magnets operating at high heat loads as the ones for interaction region of particle colliders or for fast cycling synchrotrons, the limited heat transfer capability of state-of-the-art electrical insulation may constitute a heavy limitation to performance. In the LHC main magnets, Nb-Ti epoxy-free insulation, composed of polyimide tapes, has proved to be permeable to superfluid helium, however the heat flux is rather limited.After a review of the standard insulation scheme for Nb-Ti and of the associated heat transfer mechanisms, we show the existence of a large margin available to improve insulation permeability. We propose a possible way to profit of such a margin in order to increase significantly the maximum heat flux drainable from an all polyimide insulated Nb-Ti coil, as it is used in modern accelerator magnets.

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Heat transport through helium II

Cited by 54 publications

References 34 publications

Quantum vortices and thermally induced luminescence of nitrogen nanoclusters immersed in liquid helium

Quantum vortices and thermally induced luminescence of nitrogen nanoclusters immersed in liquid helium

Steady-State heat transfer through micro-channels in pressurized He II

Cable Insulation Scheme to Improve Heat Transfer to Superfluid Helium in Nb-Ti Accelerator Magnets

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