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Boiling heat transfer and pressure drop of a refrigerant flowing in a vertical small diameter tube.

Author(s) : MIYATA K., MORI H., OHISHI K., et al.

Summary

In this study, experiments were performed to examine characteristics of flow boiling heat transfer and pressure drop of a refrigerant R410A flowing in a vertical copper smooth tube with 1.0 mm inside diameter. Local heat transfer coefficients were measured in a range of mass fluxes from 30 to 200 kg/(m2.s), heat fluxes from 1 to 16 kW/m2 and qualities from 0 to 1 at evaporation temperature of 10°C. Pressure drops were also measured at mass fluxes of 100 and 200 kg/(m2.s) for upward flow and of 30, 50, 100 and 200 kg/(m2.s) for downward flow and qualities from 0.1 to 0.9. Three types of flow pattern were observed in the tube: a slug, a slug-annular and an annular flow. Based on the measurements, the characteristics of frictional pressure drop, heat transfer coefficient and dry-out qualities were clarified.

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Details

  • Original title: Boiling heat transfer and pressure drop of a refrigerant flowing in a vertical small diameter tube.
  • Record ID : 2009-1488
  • Languages: English
  • Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2008/07/14

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