抄録
The effect of lubricating oil on evaporation heat transfer characteristics and hydraulic behavior of carbon dioxide in a horizontal tube are experimentally investigated in this study. In our experiment, two kinds of heating methods, namely a direct current carrying heating and an electric heater heating, are used. However, because the former method has the superior experimental accuracy, the data obtained using former method will be described and discussed. The main test section is an ID of 4.59 mm stainless tube, which is directly heated by electricity from an electric pole and mass flux (400,600,800 kg/m2s), heat flux (5,10,15 kW/m2), quality (0.1 -1.0) and oil concentration (1,5 mass%) are adopted as experimental parameters. Finally, to take into account the oil mixing effects, the correlation of pressure drop and evaporation heat transfer characteristics are proposed. Both empirical correlations have accuracy within ±30%.
