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.
|Number of pages||11|
|Journal||International Journal of Heat and Mass Transfer|
|Publication status||Published - 2017|
Bibliographical noteFunding 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).
© 2016 Elsevier Ltd
Copyright 2018 Elsevier B.V., All rights reserved.
- Dispersion stability
- Mass transfer enhancement
- Nanoemulsion absorbents
- Silicone oil
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes