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Une nouvelle méthode pour la modélisation de l'écoulement de HFC-134a dans des tubes capillaires adiabatiques.

A new method of modelling HFC-134a flow through adiabatic capillary tubes.

Auteurs : WANG L., ZHANG G. Q., LIU L., et al.

Résumé

Three distinct regime models of R134a flow in capillary tubes are discussed. Rather than traditional solutions in which incremental length was taken as the independent variable, pressure is taken as the independent variable to simulate R134a flow through adiabatic capillary tubes. Choking conditions are captured and critical mass flux is derived in iteration when length change is less than or equal to zero, it avoids not only directly calculating critical mass flux in assumption of Fanno flow, but also involving the singularity that pressure gradient or entropy is infinite under choking conditions. The present prediction based on the method presented in the study is satisfactory. The R134a flow characteristics based on the present prediction are very similar to those derived from experimental data. The maximum and average relative deviation between the present critical mass flux predictions at choking conditions and the results derived from Chen's correlations are 11 and 5% respectively. However, these prediction values are in better agreement with experimental data only within an average relative deviation of 3%.

Détails

  • Titre original : A new method of modelling HFC-134a flow through adiabatic capillary tubes.
  • Identifiant de la fiche : 2006-2328
  • Langues : Anglais
  • Source : Cryogenics and refrigeration. Proceedings of ICCR 2003.
  • Date d'édition : 22/04/2003

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