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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
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 vapor 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 vapor 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 ±15%.
Measurement and Correlation of Frictional Pressure Drop of R-410A/Oil Mixture Flow Boiling in a 7 mm Straight Smooth Tube
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 vapor 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 vapor 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 ±15%.
Measurement and Correlation of Frictional Pressure Drop of R-410A/Oil Mixture Flow Boiling in a 7 mm Straight Smooth Tube
Hu, Haitao (Autor:in) / Ding, Guoliang (Autor:in) / Wei, Wenjian (Autor:in) / Wang, Zhence (Autor:in) / Wang, Kaijian (Autor:in)
HVAC&R Research ; 14 ; 763-781
01.09.2008
19 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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