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Void fraction of CO2 and ammonia in multiport aluminium microchannel tubes.

Author(s) : ADAMS D. C., BURR J., HRNJAK P., et al.

Summary

An experimental investigation of adiabatic void fraction was conducted using 6-port and 14-port microchannels with hydraulic diameters of 1.54 and 1.02 mm, respectively. Two-phase fluid flow conditions include mass fluxes from 50 to 300 kg/s.m2, qualities between 0 and 1, and saturation temperatures for working fluids carbon dioxide at 15°C and ammonia at 35°C. Experiments indicate that void fraction is dependent upon hydraulic diameter, mass flux, quality, and flow regime, which can be related to the vapour density of the refrigerant. In general, models exist to predict the experimental two-phase flow pressure drop and void fraction satisfactorily for specific conditions, but no comprehensive model has been formulated that encompasses the physical properties defining two-phase flow.

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Details

  • Original title: Void fraction of CO2 and ammonia in multiport aluminium microchannel tubes.
  • Record ID : 2007-1486
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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