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Configurations de l'écoulement et modes transitoires des films tombants sur des tubes plats.

Flow patterns and mode transitions for falling-films on flat tubes.

Numéro : pap. n. R28, 2461

Auteurs : WANG X., HRNJAK P. S., ELBEL S., et al.

Résumé

The transitional Reynolds numbers for different patterns are available and a proposed transitional map is also provided in this paper. The transition of falling-films on flat tubes is studied in this work. Water and ethylene glycol are used as working fluids, for falling-film experiments conducted under adiabatic conditions, without an imposed vapor flow. The flow patterns are recorded using a high-speed, digital camera over a range of flow rate and tube spacing. The flow patterns are similar to those on round tubes, including sheet, sheet-jet, jet, jet-droplet and droplet flows, but the transitions for ethylene glycol are different–there is no sheet-jet pattern during transition between the sheet and jet flow patterns. The transition threshold increases with tube spacing and the effect of distributor height depends on flow patterns. The transitional Reynolds numbers for different patterns are available and a proposed transitional map is also provided in this paper.

Documents disponibles

Format PDF

Pages : 8 p.

Disponible

  • 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 : Flow patterns and mode transitions for falling-films on flat tubes.
  • Identifiant de la fiche : 30001001
  • Langues : Anglais
  • Source : 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 12/07/2010

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