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Measurement and correlation of frictional pressure drop of R-410A/oil mixture flow boiling in a 7 mm straight smooth tube.

Author(s) : HU H., DING G., WEI W., et al.

Type of article: Article

Summary

Two-phase frictional pressure drop characteristics of an R-410A/oil mixture flow boiling inside a straight, smooth tube with an outside diameter of 7.0 mm were investigated experimentally. Experimental parameters include an evaporation temperature of 5°C, mass fluxes from 200 to 400 kg/(m2.s), heat fluxes from 7.56 to 15.12 kW/m2, inlet vapour qualities from 0.2 to 0.7, and nominal oil concentrations from 0 to 5%. The test results show that frictional pressure drop of an R-410A/oil mixture increases with the mass flux, the presence of oil enhances two-phase frictional pressure drop, and the effect of oil on frictional pressure drop is found to be more evident at higher vapour qualities where the local oil concentrations are higher. A new correlation to predict the local frictional pressure drop of an R-410A/oil mixture flow boiling inside a straight, smooth tube is developed based on the local properties of the refrigerant/oil mixture, and it agrees with 92% of the experimental data within a deviation of plus or minus 15%.

Details

  • Original title: Measurement and correlation of frictional pressure drop of R-410A/oil mixture flow boiling in a 7 mm straight smooth tube.
  • Record ID : 2008-2435
  • Languages: English
  • Source: HVAC&R Research - vol. 14 - n. 5
  • Publication date: 2008/09

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