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Ebullition libre nucléée, ébullition pelliculaire et convection libre monophasique à des pressions allant jusqu'à l'état critique. II. Variations circonférentielles de la surchauffe de la paroi d'un cylindre horizontal de 25 mm en cuivre.

Ebullitión libre nucleada, ebullición pelicular y convección libre monofásica a presiones próximas al estado crítico. II. Variación circunferencial del sobrecalentamiento de la pared para un cilindro horizontal de cobre de 25 mm.

Auteurs : GORENFLO D., BAUMHÖGGER E., WINDMANN T., et al.

Type d'article : Article

Résumé

Transcritical working cycles of refrigerants led to increased interest in heat transfer near the critical state. In general, experimental results for this region differ significantly from those far from it because some fluid properties vary much more there than at a greater distance. In this paper, two-phase and single-phase free convective heat transfer to refrigerant R125 is discussed for fluid states very close to the critical point and far from it. In part II, circumferential variation of the wall superheat is related to the motion of the fluid within the superheated boundary layer. In nucleate boiling, a minimum in the superheat develops on the lower parts of the wall that can be related to additional evaporation into the bubbles sliding upwards in close contact with the heated wall. In film boiling and supercritical free convection, a slight maximum superheat is discovered on the lower parts of the wall, the relative size of which increases close to the critical point, while it does not exist in far sub-critical free convection.

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Format PDF

Pages : 28-43 (14 p.)

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  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Ebullitión libre nucleada, ebullición pelicular y convección libre monofásica a presiones próximas al estado crítico. II. Variación circunferencial del sobrecalentamiento de la pared para un cilindro horizontal de cobre de 25 mm.
  • Identifiant de la fiche : 30002663
  • Langues : Espagnol
  • Source : Frío Calor Aire acondicionado - vol. 39 - n. 438
  • Date d'édition : 07/2011

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