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

Author(s) : NAKAGAWA M., BERANA M. S., KISHINE A.

Type of article: Article, IJR article

Summary

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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Details

  • Original title: Supersonic two-phase flow of CO2 through converging-diverging nozzles for the ejector refrigeration cycle.
  • Record ID : 2009-1572
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 6
  • Publication date: 2009/09

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