Chinese Science Bulletin

, Volume 47, Issue 2, pp 162–164 | Cite as

Dynamic behavior of the He II-He I phase transition under gravity

  • Peng Zhang
Notes
  • 6 Downloads

Abstract

The phase transition of superfluid helium (He II) to normal fluid helium (He I) is studied in this note. The He II-He I interface is found to move upwards under finite heat current. The temperature tracks are measured by four high resolution temperature sensors (HRTs). And the shifting of the λ point temperature (phase transition temperature) along the cell is studied experimentally and theoretically. Under gravity, the shifting of the λ point temperature increases with the pressure. The experimental results agree well with the theoretical ones.

Keywords

He II-He I interface gravity phase transition 

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References

  1. 1.
    Khalatnikov, I. M., Introduction to the theory of superfluidity, New York: Benjamin, 1965.Google Scholar
  2. 2.
    Fu, H. Y., Baddar, H., Kuehn, K. et al., A high-resolution thermometer for the range from 1.6 to 5 K, J. of Low Temp. Physics, 1998, 111(1/2): 49.CrossRefGoogle Scholar
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    Ahlers, G., Finite-size and gravity effects on the thermal conductivity of 4He near the λ line, J. of Low Temp. Physics, 1999, 115(3/4): 143.CrossRefGoogle Scholar
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    Baddar, H., Ahlers, G., Kuehn, K. et al. Thermal resistance of 4He below but very near the superfluid transition, J. of Low Temp. Physics, 2000, 119(1/2): 1.CrossRefGoogle Scholar

Copyright information

© Science in China Press 2002

Authors and Affiliations

  • Peng Zhang
    • 1
  1. 1.Institute of Refrigeration and CryogenicsShanghai Jiao Tong UniversityShanghaiChina

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