초임계 조건에서 이산화탄소 혼합물의 점성 측정

Abstract

The purpose of this study was to experimentally investigate the viscosity for carbon dioxide with nitrogen and methane impurities under supercritical conditions. The experimental setup was comprised of a test section, a condensation section for the liquefaction of carbon dioxide before entering the pump, and a heating section for controlling the temperature of the entrance of the test section. The test section was comprised of a capillary tube with a length of 300 mm and a ⅛ inch diameter. The experiment was performed under a mass flux of 200~400 kg/(m²s) at a impurities concentration of 1.0~5.0 mol%. The viscosity of nitrogen mixture was lower by 0.5% for 1% mole fraction, 4.9% for 3% mole fraction, and 23.5% for 5% mole fraction compared with that of pure CO₂. The viscosity of methane mixture was lower by 7.3% for 1% mole fraction, 11.2% for 3% mole fraction, and 24.4% for 5% mole fraction compared with that of pure CO₂. A model for predicting the viscosity of CO₂ mixtures under the supercritical condition was developed by the multi-variable regression analysis. The model included the non-dimensional parameters for temperature, pressure, and density.