Partager

Document IIF

Ebullition libre nucléée, ébullition pelliculaire et convection libre monophasique à des pressions allant jusqu'à l'état critique. I. Transfert de chaleur intégral des cylindres horizontaux en cuivre.

Nucleate pool boiling, film boiling and single-phase free convection at pressures up to the critical state. I. Integral heat transfer for horizontal copper cylinders.

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

Type d'article : Article, Article de la RIF

Résumé

Transcritical working cycles for refrigerants have 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, measurements for two-phase and single-phase free convective heat transfer from an electrically heated copper tube with 25 mm OD to refrigerant R125 are discussed for fluid states very close to the critical point and far from it. It is shown that heat transfer for film boiling slightly below and for free convection slightly above the critical pressure is very similar. The new, and also previous, experimental data for nucleate boiling, film boiling, and single-phase free convection are compared with calculated results between atmospheric and critical pressure. It can be concluded that the Principle of corresponding states in its simplest form is very well suited to transfer the results to other refrigerants. In part II (see this Bulletin, reference 2010-1094), particular attention will be given to a minimum superheat for nucleate boiling and a maximum superheat for film boiling and single-phase free convection within the circumferential variation of the isobaric wall superheat on the lower parts of the tube.

Documents disponibles

Format PDF

Pages : pp. 1229-1250

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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

Détails

  • Titre original : Nucleate pool boiling, film boiling and single-phase free convection at pressures up to the critical state. I. Integral heat transfer for horizontal copper cylinders.
  • Identifiant de la fiche : 2010-1093
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 33 - n. 7
  • Date d'édition : 11/2010

Liens


Voir d'autres articles du même numéro (24)
Voir la source

Indexation