Won Jun Lee ; Rin Yun
In this study, the viscosity of a CO2-gas mixture was investigated for the transportation of the captured CO2-gas in pipelines and for the designing of a thermal system, both of which involve the utilization of the CO2-gas mixture. The viscosities of the CO2-gas mixture, CO2+CH4, CO2+H2S, and CO2+N2 were predicted using three different models as follows : Chung, TRAPP, and REFPROP. The predictability values of the models were validated by comparing the estimated results with the experiment data for the CO2+CH4 and CO2+N2 under high-density conditions. The Chung model showed 2.41%, which is the lowest mean deviation of the prediction among the model. Based on the Chung model, the mixture mole fractions were changed from 0.9, 0.95, and 0.97, the mixture pressure was ranged from 80 bar to 120 bar by 10 bar, and the mixture temperature was varied from 310 K to 400 K by 10 K to observe the effects of the parameters on the mixture viscosity. Considering the high mole fraction of the CO2 in the mixture, a significant variation of the mixture viscosity was observed close to the pseudo-critical temperature, and the viscosity for the CO2+H2S mixture shows the highest values compared with those of the CO2+CH4 and CO2+N2.