Experiments on the Breakdown of Heat Transfer in Liquid Helium II

  • M. v. Schwerdtner
  • G. Stamm
  • W. Fiszdon
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 35)

Abstract

Transient heat transport in counterflowing Helium II is investigated experimentally in a rectangular channel of 2.6 cm x 2.6 cm cross section. The mechanism of heat transfer, based on internal convection, is affected strongly by mutual friction due to the presence of superfluid vortex lines. Simultanous measurements of temperature, vortex line density (VLD) and counterflow velocity have been performed, using especially designed high sensitivity probes with a short response time. It is shown that, with increasing input heat flux, the counterflow velocity and hence the internal heat flux reaches a maximum depending on the flow parameters, which leads to a strong increase of temperature in the region close to the heater (and may cause there even evaporation or a phase change to He I). As shown by corresponding measurements and supported by theoretical calculations, this is correlated with the presence of a large amount of superfluid vortex lines, that have been produced during the passage of the heat pulse and decay afterwards. The experimental findings compare favourably with a proposed simple phenomenological model.

Keywords

Entropy Vortex Quartz Convection Chromium 

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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • M. v. Schwerdtner
    • 1
  • G. Stamm
    • 1
  • W. Fiszdon
    • 2
  1. 1.Max-Planck-lnstitut für StrömungsforschungGöttingenWest Germany
  2. 2.Polish Academy of Sciences and University of WarsawWarsawPoland

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