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Inversion de température et transport de chaleur contre la chute de température lors de la convection diphasique d'hélium cryogénique.

Temperature inversion and heat transport against the temperature drop in two-phase convection of cryogenic helium.

Numéro : pap. n. 60

Auteurs : URBAN P., SCHMORANZER D., HANZELKA P., et al.

Résumé

In the system of two bodies A and B connected by a two-phase vapour-liquid system consisting only of cryogenic helium, we observed anomalous heat transport from the colder but heated body B to the warmer but cooled body A. We noticed this effect during the process of liquid evaporation inside a cylindrical pressure convection cell used for study of Rayleigh-Bénard convection. This anomalous heat transfer occurs under non-equilibrium conditions, owing to the phase transitions that take place inside the cell while temperature inversion develops between the heated but cooler bottom plate and the cooled but warmer top plate. This process is, by virtue of the system being open with respect to heat transport, in no contradiction to the second law of thermodynamics, and a numerical model was formulated that describes the observations with good agreement.

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Pages : 7 p.

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Détails

  • Titre original : Temperature inversion and heat transport against the temperature drop in two-phase convection of cryogenic helium.
  • Identifiant de la fiche : 30011196
  • Langues : Anglais
  • Source : Cryogenics 2014. Proceedings of the 13th IIR International Conference: Prague, Czech Republic, April 7-11, 2014.
  • Date d'édition : 07/04/2014

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