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Solubility of hydrogen in liquid helium – project progress and orientational experiments.
Number: 0067
Author(s) : WILL J., HABERSTROH C.
Summary
The solubility of hydrogen in liquid helium seems to be unknown. One potential explanation for this could be the exceedingly low solubility limit, making this phenomenon irrelevant for the vast majority of applications. However, in cryogenics, this effect is crucial. Traces of hydrogen in liquid helium and in the liquid helium supply systems result in a malfunction of liquid helium flow cryostats and throttle devices. The project HyLiqHe (granted by DFG) aims among other objectives to quantify the solubility limits by measurement.
Due to the low solubility limit, which is expected to be in the range of hundreds to tens of ppb (parts per billion), dispersion can be reasonably assumed for a corresponding mixture. Distinguishing between precipitated and solubilised hydrogen is therefore a particular challenge. An experimental setup is currently being developed that will allow the preparation, analysis and condensation of helium/hydrogen mixtures, as well as the detection of the presence of precipitated hydrogen particles.
In this contribution, a test setup for a preliminary quantification of the solubility limit is presented. For this purpose, standard laboratory liquid helium dewar vessels are intentionally contaminated with hydrogen and the variation in concentration at different heights of the helium phases are analysed using gas chromatography.
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Details
- Original title: Solubility of hydrogen in liquid helium – project progress and orientational experiments.
- Record ID : 30033901
- Languages: English
- Subject: Technology
- Source: Cryogenics 2025. Proceedings of the 18th IIR International Conference on Cryogenics, Prague, Czech Republic, 7-11 April 2025.
- Publication date: 2025/04/07
- DOI: http://dx.doi.org/10.18462/iir.cryo.2025.0067
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