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Abstract
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In this study, a three-dimensional model was examined for the evalua-
tion 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 ex-
perimental data. Furthermore, temperature was found to have a significant
effect on the diffusivity, and it improved by increasing nanofluid concen-
tration 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.
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