Partager

Document IIF

Configurations d'écoulement et chute de pression d’écoulements verticaux ascendants dans un tube avec des protrusions similaires à des collecteurs au R134a.

Flow patterns and pressure drop of vertical upward flows in a tube with header-like protrusions with R134a.

Numéro : pap. n. 844

Auteurs : QIAN H., HRNJAK P.

Résumé

Flow patterns and pressure drop in a vertical tube with header-like protrusions in adiabatic conditions are presented. Three major flow patterns are observed with a high-speed camera in the mass flow rate range studied in this paper: slug flow, churn flow and annular flow. The flow pattern map is proposed. As the distance between two measurement ports along the tube decreases, pressure drop of refrigerant flows in the tube with protrusions decreases for all vapor qualities and mass flow rates. The relation is close to linear. However, the relation between pressure drop between two certain ports and quality is not linear. For relatively larger mass flow rate, as the quality increases from 0, pressure drop decreases first and then increases. There is a smallest pressure drop at moderate quality. The smallest pressure drop among all the qualities between two certain ports happens decrease from x=1 to x=0.6 as mass flow rate increase from 3 g/s to 7.5 g/s. If the quality is kept to be constant, DP is smaller for higher mass flow rate for relatively small qualities. However, in the high-quality range, DP is larger for higher mass flow rate.

Documents disponibles

Format PDF

Pages : 8

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 : Flow patterns and pressure drop of vertical upward flows in a tube with header-like protrusions with R134a.
  • Identifiant de la fiche : 30026374
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0844

Liens


Voir d'autres communications du même compte rendu (632)
Voir le compte rendu de la conférence

Indexation