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Boiling heat transfer and pressure drop of a refrigerant flowing vertically downward in a small rectangular tube.

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

Summary

Experiments were performed on flow boiling heat transfer and two-phase pressure drop of a refrigerant R410A flowing downward in a vertical small copper rectangular tube with 1.04 mm inside hydraulic equivalent diameter for the development of a high-performance heat exchanger using small tubes or multi-port extruded tubes for air conditioning systems. Local heat transfer coefficients were measured in a range of mass velocities from 30 to 200 kg/m2.s, heat fluxes from 1 to 16 kW/m2 and qualities from 0.05 to 1 at the evaporation temperature of 10°C. Pressure drops were also measured at mass velocities from 30 to 200 kg/m2.s and qualities from 0.1 to 0.9 at the saturation temperature of 10°C under the adiabatic condition. The characteristics of frictional pressure drop, heat transfer coefficient and dry-out quality were clarified by comparing the measurements with the data for the circular tube of 1.00 mm inside diameter previously obtained.

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Pages: 2009-5

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Details

  • Original title: Boiling heat transfer and pressure drop of a refrigerant flowing vertically downward in a small rectangular tube.
  • Record ID : 2009-1959
  • Languages: English
  • Source: 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2009/06/23

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