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Pressure drop characteristics of R410A-oil mixture flow boiling in small smooth tubes.

Author(s) : GAO Y., DENG B., DING G., et al.

Summary

This study presents experimental frictional pressure drop for R410A-oil mixture flow boiling in small horizontal smooth tubes with outside diameters of 5.0 and 3.0 mm. Experimental conditions cover nominal concentrations from 0 to 5%. The test results show that the presence of oil enhances two-phase frictional pressure drop about 0-120 and 0-90% at present conditions for 5.0 and 3.0 mm smooth tubes, respectively, and the enhanced effect is more evident at higher vapour qualities where the local oil concentrations are higher. A new correlation to predict the local frictional pressure drop of R410A-oil mixture flow boiling inside conventional size and small smooth tubes is developed based on local properties of refrigerant-oil mixture, and the experimental data of 5.0 and 3.0 mm smooth tubes and that of 7.0 mm smooth tube (Hu et al., 2008) are well correlated with the new correlation.

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Pages: pp. 75-80

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Details

  • Original title: Pressure drop characteristics of R410A-oil mixture flow boiling in small smooth tubes.
  • Record ID : 2010-0727
  • Languages: English
  • Source: ACRA-2009. The proceedings of the 4th Asian conference on refrigeration and air conditioning: May 20-22, 2009, Taipei, R.O.C.
  • Publication date: 2009/05/20

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