Advertisement

Steady State Heat Transfer Characteristics in He I and He II with a Copper Surface

  • A. Iwamoto
  • R. Maekawa
  • T. Mito
  • S. Satoh
Chapter
Part of the Advances in Cryogenic Engineering book series (ACRE)

Abstract

Steady-state heat transfer in He I and saturated He II has been measured. The bath temperatures are 4.20 K, 1.90 K and 1.78 K in saturated pressure. The sample is an oxygen free copper cylinder 20mm in diameter. It is mounted in a vacuum chamber for thermal insulation with an exposed surface facing upward into the He coolant. The heat transfer surface is polished by 0.5 μm alumina powder or oxidized by the chemicals. A thermofoil heater is attached on the opposite side of the heat transfer surface. The surface temperature is estimated by a temperature gradient in the cylinder. The temperatures are measured by calibrated germanium resistance temperature sensors. Dependence of the heat transfer characteristics from the copper surfaces to He I and He II on the surface treatment are discussed.

Keywords

Heat Transfer Heat Flux Polished Surface Bath Temperature Heat Transfer Characteristic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    A. Kashani and S. W. Van Sciverciver, High heat flux Kapitza conductance of technical copper with several different surface preparation, Cryogenics 25:238 (1985).CrossRefADSGoogle Scholar
  2. 2.
    S. W. Van Sciverciver, Kapitza conductance of aluminum and heat transport through subcooled He II, Cryogenics 18:521 (1978).CrossRefGoogle Scholar
  3. 3.
    G. Claudet and P. Seyfert, Bath cooling with subcooled superfluid helium, in: “Advances in Cryogenic Engineering Vol.27,” Plenum Press, New York (1981), p.441Google Scholar
  4. 4.
    E. A. Jones and J. C. van der Sluijs, Some experiments on the influence of surface treatment on the Kapitza conductance between copper and He4 at temperatures from 1.2 K to 2.0 K, Cryogenics 13:535 (1973)CrossRefADSGoogle Scholar
  5. 5.
    N. Yanagi, et al., Development, fabrication, testing and joints of aluminum stabilized superconductor for the helical coils of LHD, in: “Proceedings of ICEC16/ICMC,” T. Haruyama, T. Mitsui and K. Yamafuji, ed., Elsevier Science, Tokyo (1997), p.751.Google Scholar
  6. 6.
    O. Motojima, et al., Physics and engineering design studies on the Large Helical Device, Fusion Engineering and Design 20:3 (1993)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • A. Iwamoto
    • 1
  • R. Maekawa
    • 1
  • T. Mito
    • 1
  • S. Satoh
    • 1
  1. 1.National Institute for Fusion ScienceToki, GifuJapan

Personalised recommendations