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A model for frictional pressure drop during vapour-liquid flow in minichannels.

Author(s) : CAVALLINI A., ROSSETTO L., MATKOVIC M., et al.

Summary

The authors measured pressure drops during adiabatic flow of R134a, R410A and R236ea inside a flat multiport mini-channel tube with a 1.4 mm hydraulic diameter. The experimental frictional pressure gradients were compared with correlations available in the literature and no correlation was able to predict the gradients in all the experimental conditions. The paper suggests a model for the frictional pressure gradient valid for adiabatic flow or for flow during condensation inside horizontal minichannels of halogenated refrigerants. The proposed procedure takes into account the effect of the entrainment rate of droplets from the liquid film. The model is applied to the annular, annular-mist flow. Comparisons between the authors' data and predicted values show the satisfactory behaviour of the new model. The model is also able to predict experimental frictional pressure gradients measured by Coleman (2000), Zhang (1998), Hirofumi and Webb (1995) and Webb and Ermis (2001). The model can be extended to intermittent flow in minichannels and it is also applied with success to horizontal macrotubes.

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Pages: 2005-3

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Details

  • Original title: A model for frictional pressure drop during vapour-liquid flow in minichannels.
  • Record ID : 2006-0649
  • Languages: English
  • Source: Commercial Refrigeration. Thermophysical Properties and Transfer Processes of Refrigerants. Proceedings of the IIR International Conferences.
  • Publication date: 2005/08/02

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