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Journal of Low Temperature Physics

, Volume 196, Issue 1–2, pp 197–203 | Cite as

Visualization of a Coflow Jet in Superfluid Helium

  • M. J. JacksonEmail author
  • D. Schmoranzer
  • J. Luzuriaga
Article
  • 70 Downloads

Abstract

We present preliminary results of the visualization of a submerged coflow jet of liquid helium produced by a fountain pump. The jet propagating inside the bulk superfluid is visualized with particle tracking velocimetry using hydrogen particles. We compare the characteristics of the coflow jet with those measured in classical fluids such as helium gas or water. In contrast to the classical experiments, a temperature-dependent angle of the jet is observed, suggesting that the flow may not be described quasi-classically, despite the strong coupling between normal and superfluid components by mutual friction. We report on the statistics of the velocities inferred from the particle trajectories recorded by a high-speed camera at 1.68 and 1.95 K, for jet velocities ranging from 47 to 4500 mm/s.

Keywords

Superfluid \({}^{4}\hbox {He}\) Flow Visualization Turbulent Jet 

Notes

Acknowledgements

This research is supported by the Czech Science Foundation project GAČR 17-03572S and by Grant 7AMB15AR026 under the EU-7AMB Czech–Argentine MOBILITY scheme of Czech Republic–Argentine Republic cooperation agreement ARC/14/30, without which this work would not have been possible. M.J.J. acknowledges personal support from Vakuum Praha spol. s r.o. We would also like to thank M. La Mantia, L. Skrbek and P. Švančara for useful comments and fruitful discussions.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Faculty of Mathematics and PhysicsCharles UniversityPragueCzech Republic
  2. 2.Centro Atómico Bariloche, (8400) S.C. Bariloche, CNEA, Inst. Balseiro, UNCBarilocheArgentina

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