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Ecoulement diphasique supersonique du CO2 à travers des tuyères convergentes-divergentes dans un cycle frigorifique à éjecteur.

Supersonic two-phase flow of CO2 through converging-diverging nozzles for the ejector refrigeration cycle.

Auteurs : NAKAGAWA M., BERANA M. S., KISHINE A.

Type d'article : Article, Article de la RIF

Résumé

CO2 is environmentally friendly, safe and more suitable to ejector refrigeration cycle than to vapour compression cycle. Supersonic two-phase flow of CO2 in the diverging sections of rectangular converging-diverging nozzles was investigated. The divergence angles with significant variation of decompression were 0.076°, 0.153°, 0.306° and 0.612°. This paper presents experimental decompression phenomena which can be used in designing nozzles and an assessment of isentropic homogeneous equilibrium (IHE). Inlet conditions around 6-9 MPa, 20-37°C were used to resemble ejector nozzles of coolers and heat pumps. For inlet temperature around 37°C, throat decompression boiling from the saturated liquid line, supersonic decompression and IHE solution were obtained for the two large divergence angles. For divergence angles larger than 0.306°, decompression curves for inlet temperature above 35°C approached IHE curves. For divergence angles smaller than 0.306° or for nozzles with inlet temperature below 35°C, IHE had no solution.

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Pages : 1195-1202

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  • Prix public

    20 €

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    Gratuit

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Détails

  • Titre original : Supersonic two-phase flow of CO2 through converging-diverging nozzles for the ejector refrigeration cycle.
  • Identifiant de la fiche : 2009-1572
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 6
  • Date d'édition : 09/2009

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