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Measurement of the coupled thermal transfers in a cryogenic tank with two configurations.

Mesure des transferts thermiques couplés dans un réservoir cryogénique avec deux configurations.

Author(s) : KHEMIS O., BESSAÏH R., AIT ALI M., et al.

Type of article: Article

Summary

The work presented here concerns an experimental liquid nitrogen cryostat with two configurations. The experimental device incorporates conductive transfers in the neck, convective transfers between the internal neck wall and the ascending vapour produced by boiling, and radiative transfers between the external envelope and the tank through an ultrahigh vacuum at 10-8 mm Hg. An experimental prototype was constructed in collaboration with the Orsay Nuclear Centre according to a didactic design which highlights and separates, on the one hand, the Wexler effect, and, on the other hand, the relative importance of radiation compared with conducto-convection. Thus, the variations in the Wexler effect make it possible to detect any alteration or possible deterioration of the between-walls vacuum quality with time. This article describes how the addition of a ventilated radiative screen, with variable positions on the neck (which can effectively replace several dozen floating screens) to find the optimal position which minimizes radiative flow.

Details

  • Original title: Mesure des transferts thermiques couplés dans un réservoir cryogénique avec deux configurations.
  • Record ID : 2004-2084
  • Languages: French
  • Source: Eur. J. mech. environ. Eng. - vol. 48 - n. 4
  • Publication date: 2003/12
  • Document available for consultation in the library of the IIR headquarters only.

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