Determination of CO2 gas diffusivity in nanofluids: numerical modeling study

In this study, a three-dimensional model was examined for the evaluation of co2 diffusivity in pure water and silicon oxide, aluminum oxide and titanium oxide nanofluids with the concentrations of 0.05, 0.1, and 0.2 wt%, respectively. different parameters such as temperature and the nanoparticles weight percentage on co2 diffusivity in a diffusivity cell were studied in comsol software. next, co2 diffusivity was compared with the experimental results. the modeling results showed that water was saturated with gas at 36,000 seconds, and the highest amount of absorbed gas happened at 0.32 m. the cfd results were then validated with the experimental data. furthermore, temperature was found to have a significant effect on the diffusivity, and it improved by increasing nanofluid concentration until the critical value of 0.1 wt% in all conditions. moreover, tio2 nf was introduced as an appropriate nanofluid for the phenomenon of mass diffusivity