TY - JOUR
T1 - Mass transfer performance enhancement by nanoemulsion absorbents during CO2absorption process
AU - Jeong, Myunghwan
AU - Lee, Jae Won
AU - Lee, Seung Joo
AU - Kang, Yong Tae
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (Grant number: 2016R1A2B3007577) and Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20144010200770).
PY - 2017
Y1 - 2017
N2 - In this study, nanoemulsion absorbents (silicone oil/methanol) were manufactured by adding nano-size oil to absorbents for CO2absorption performance enhancement. To evaluate the dispersion stability of the nanoemulsion, oil droplet size measurement, turbidity measurement, and Tyndall effect visualization experiments were conducted. The effect of the ratio and concentration of oil and surfactants on the mass transfer enhancement was evaluated through thermal conductivity measurement using the transient hot wire method and the visualization analysis of CO2bubble absorption. The oil (silicone) and surfactant ratio of 2:1 was found to be the optimum condition through the results of dispersion stability analysis. In the CO2bubble absorption results obtained through the visualization analysis, the nanoemulsion with 0.01 vol% oil concentration showed the most significant absorption performance improvement. It was found that nano-size oil dispersion contributed to mass transfer enhancement, which was caused by the convective motion of nano-size oil droplets, not by enhanced thermal conductivity. Finally, the mechanisms of mass transfer enhancement by nanoemulsions are proposed, and it is concluded that the CO2absorption performance is enhanced by the shuttle effect and the hydrodynamic effect by the nanoemulsion absorbents.
AB - In this study, nanoemulsion absorbents (silicone oil/methanol) were manufactured by adding nano-size oil to absorbents for CO2absorption performance enhancement. To evaluate the dispersion stability of the nanoemulsion, oil droplet size measurement, turbidity measurement, and Tyndall effect visualization experiments were conducted. The effect of the ratio and concentration of oil and surfactants on the mass transfer enhancement was evaluated through thermal conductivity measurement using the transient hot wire method and the visualization analysis of CO2bubble absorption. The oil (silicone) and surfactant ratio of 2:1 was found to be the optimum condition through the results of dispersion stability analysis. In the CO2bubble absorption results obtained through the visualization analysis, the nanoemulsion with 0.01 vol% oil concentration showed the most significant absorption performance improvement. It was found that nano-size oil dispersion contributed to mass transfer enhancement, which was caused by the convective motion of nano-size oil droplets, not by enhanced thermal conductivity. Finally, the mechanisms of mass transfer enhancement by nanoemulsions are proposed, and it is concluded that the CO2absorption performance is enhanced by the shuttle effect and the hydrodynamic effect by the nanoemulsion absorbents.
KW - COabsorption
KW - Dispersion stability
KW - Mass transfer enhancement
KW - Nanoemulsion absorbents
KW - Silicone oil
KW - Surfactants
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U2 - 10.1016/j.ijheatmasstransfer.2016.12.073
DO - 10.1016/j.ijheatmasstransfer.2016.12.073
M3 - Article
AN - SCOPUS:85007484194
VL - 108
SP - 680
EP - 690
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
SN - 0017-9310
ER -