Dariush Mowla

Application of nanoparticles in aqueous base-fluids for intensification of absorption rate is an efficient method for absorption progress within the system incorporating bubble-liquid process. In this research, SO₂ and CO₂ were separately injected as single raising bubbles containing nanofluids to study the impact of nanoparticle effects on acidic gases absorption. In order to do this, comprehensive experimental studies were done. These works also tried to investigate the effect of different nanofluids such as water/Al₂O₃ or water/Fe₂O₃ or water/SiO₂ on the absorption rate. The results showed that the absorption of CO₂ and SO₂ in nanofluids significantly increases up to 77 percent in comparison with base fluid. It was also observed that the type of gas molecules and nanoparticles determine the mechanism of mass transfer enhancement by nanofluids. Additionally, our findings indicated that the values of mass transfer coefficient of SO₂ in water/Al₂O₃, water/Fe₂O₃ and water/SiO₂ nanofluids are, respectively, 50%, 42% and 71% more than those of SO₂ in pure water ( $k_L{}_{{\mathrm{SO}}_2-water}=1.45\times {10}^{-4} \mathrm{m}/\mathrm{s}$ ). Moreover, the values for CO₂ in above nanofluids were, respectively, 117%, 103% and 88% more than those of CO₂ in water alone ( $k_L{}_{{\mathrm{CO}}_2-water}=1.03\times {10}^{-4} \mathrm{m}/\mathrm{s}$ ). Finally, this study tries to offer a new comprehensive correlation for mass transfer coefficient and absorption rate prediction.