| Title |
Measurement of Thermal Conductivity for Supercritical CO2 with Nitrogen |
| DOI |
https://doi.org/10.6110/KJACR.2022.34.2.059 |
| Keywords |
이산화탄소 포집 저장기술; 이산화탄소 수송; 비정상 열선법; 열전도율; 이산화탄소 혼합물; 초임계 Carbon Capture & Storage; CO2 transportation; Transient hot wire method; Thermal conductivity; CO2 mixture; Supercritical |
| Abstract |
In this study, the thermal conductivity of carbon dioxide with nitrogen in the supercritical state was experimentally measured. A non-stationary hot wire method, was used as a method for measuring thermal conductivity. The experimental equipment comprised a Wheatstone Bridge, a power supply, an oscilloscope, a gas inlet, a thermocouple, and a pressure gauge. The pressure vessel of the test section is designed to sufficiently withstand high pressure of 100 bar or more. As the heating wire, a platinum wire was used due to relation between temperature and resistance. When a voltage of 20V was applied, the platinum wire was heated and the thermal conductivity was measured using the slope of the voltage difference caused by the change in resistance. The molar concentration of nitrogen in the carbon dioxide and nitrogen mixture was changed to 1%, 3%, and 5%, the temperature was set to 35℃, 40℃, 45℃, and the pressure was varied from 80 to 100 bar. The experimental results were verified by measuring the thermal conductivity of pure CO2 and pure N2. The effect of the temperature, pressure, and the molar concentration of nitrogen on the thermal conductivity was physically explained by introducing the thermophysical properties of the mixture. |