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Frictional pressure drop and void fraction during evaporation of C3H8, NH3, and CO2 in single circular small tubes.

Number: pap. ID: 456

Author(s) : CHOI K. I., PAMITRAN A. S., OH J. T., et al.

Summary

An experimental study of evaporation pressure drop in single circular small tubes was conducted for flow of C3H8, NH3 and CO2 under some various flow conditions. The test matrix encompasses the entire quality range from 0.0 to 1.0, mass fluxes from 50 to 600 kg/m2.s, heat fluxes from 5 to 70 kW/m2 and saturation temperatures from 0 to 10°C. The test section was made of circular stainless steel tubes with inner diameters of 1.5 and 3.0 mm, and a length of 2000 mm in horizontal orientation. The test section was heated uniformly by applying an electric power to the tubes directly. The effects of mass flux, heat flux, saturation temperature and inner tube diameter are presented in this study. The pressure drop of CO2 is the lowest among the working refrigerants. The experimental pressure drop was compared with some existing pressure drop correlations. Existing void fraction prediction methods were evaluated for the present experimental pressure drop. A modified pressure drop correlation using homogenous void fraction model is developed.

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Details

  • Original title: Frictional pressure drop and void fraction during evaporation of C3H8, NH3, and CO2 in single circular small tubes.
  • Record ID : 30003069
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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