| Title |
Thermophysical Properties of CO2 and CO2-Hydrate Mixture and In-Tube Heat Transfer Characteristics |
| DOI |
http://dx.doi.org/10.6110/KJACR.2013.25.5.233 |
| Keywords |
이산화탄소 하이드레이트 ; 이산화탄소 하이드레이트 혼합물 ; 열역학적 물성 ; 열전달 ; 압력강하 CO2-hydrate ; CO2-hydrate mixture ; Thermophysical properties ; Heat transfer ; Pressure drop |
| Abstract |
The Thermophysical properties of thermal conductivity, viscosity, and heat capacity for CO2 slurry (CO2 gas and CO2-hydrate mixture) having a high gas phase volume fraction were predicted using the conventional mixture models and the TRAPP model under hydrate formation conditions. Based on the calculated thermophysical properties, the heat transfer coefficient and pressure drop of the CO2 slurry in the tube were predicted. The thermal conductivity of CO2 slurry ranged from 0.02 to 0.2 W/m-K, and the mixture viscosity was larger than that of pure CO2 by 1.9～2.7 times. The heat capacity of CO2 slurry ranged from 63 to 68% of that for pure CO2. The predicted heat transfer coefficient of CO2 slurry was 6 times higher than that of pure CO2. In the separate model, the estimated pressure drop increased with an increase of CO2-hydrate mole fraction, and was 60% of that of pure CO2. |