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Etudes expérimentales et théoriques sur l'inversion de l'écoulement de la pellicule annulaire dans une canalisation verticale : application au retour d'huile dans les systèmes frigorifiques.

Experimental and theoretical investigation of annular film flow reversal in a vertical pipe: application to oil return in refrigeration systems.

Auteurs : MEHENDALE S. S., RADERMACHER R.

Type d'article : Article

Résumé

The work studied, both experimentally and theoretically, the fundamental mechanism of oil transport by vapour, liquid and two-phase refrigerant through analysis of the characteristic behaviour of several refrigerant-lubricant pairs. Extensive flow visualization experiments were conducted to pinpoint the critical refrigerant flow rate for preventing oil film flow reversal in a vertical pipe with an 8-mm inside diameter for vapour refrigerant with miscible and immiscible lubricants and in the first such study, for two-phase refrigerant with immiscible lubricant. An annular flow model with a vapour core, utilizing an empirical correlation for the interfacial friction factor was also developed to predict the onset of lubricant film flow reversal.

Détails

  • Titre original : Experimental and theoretical investigation of annular film flow reversal in a vertical pipe: application to oil return in refrigeration systems.
  • Identifiant de la fiche : 2001-0756
  • Langues : Anglais
  • Source : HVAC&R Research - vol. 6 - n. 1
  • Date d'édition : 01/2000
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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