Heat and mass transfer during a sudden loss of vacuum in a liquid helium cooled tube - Part III: Heat deposition in He II

Garceau, Nathaniel; Bao, Shiran; Guo, Wei

doi:10.1016/j.ijheatmasstransfer.2021.121885

Cited by 4 publications

(2 citation statements)

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“…As shown in our early work [12], heat transfer of He II in non-homogeneous geometries (such as from cylindrical or spherical heaters) can exhibit new features. Understanding the behavior of the peak heat flux in these geometries could benefit research work such as quenchspot detection on He II cooled superconducting accelerator cavities [40,41] and the heat and mass transfer processes due to a vacuum failure in He II cooled accelerator beamline tubes [42][43][44][45].…”

Section: Discussionmentioning

confidence: 99%

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Boiling and cavitation caused by transient heat transfer in superfluid helium-4

Sanavandi,

Hulse,

Bao

et al. 2022

Preprint

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Superfluid helium-4 (He II) has been widely utilized as a coolant in various scientific and engineering applications due to its superior heat transfer capability. An important parameter required in the design of many He II based cooling systems is the peak heat flux q * , which refers to the threshold heat flux above which boiling spontaneously occurs in He II. Past experimental and numerical studies showed that q * increases when the heating time t h is reduced, which leads to an intuitive expectation that very high q * may be achievable at sufficiently small t h . Knowledge on how q * actually behaves at small t h is important for applications such as laser ablation in He II. Here we present a numerical study on the evolution of the thermodynamic state of the He II in front of a planar heater by solving the He II two-fluid equations of motion. For an applied heat flux, we determine the heating time beyond which the He II near the heater transits to the vapor phase. As such, a curve correlating q * and t h can be obtained, which nicely reproduces some relevant experimental data. Surprisingly, we find that there exists a critical peak heat flux q * c , above which boiling occurs nearly instantaneously regardless of t h . We reveal that the boiling in this regime is essentially cavitation caused by the combined effects of the first-sound and the second-sound waves in He II. Based on this physical picture, an analytical model for q * c is developed, which reproduces the simulated q * c values at various He II bath temperatures and hydrostatic head pressures. This work represents a major progress in our understanding of transient heat transfer in He II.

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Section: Discussionmentioning

confidence: 99%

“…For the x = ∆x curve, following the fast process the He II temperature and pressure remain nearly constant for over 0.1 s. During this period, the vortex-line density L gradually grows following an initial rapid increase. This initial increase Saturation line 50 45 1.76…”

Section: Explanation Of Critical Peak Heat Fluxmentioning

confidence: 93%