Enhancement of carbon dioxide absorption using carbon nanotubes – A numerical approach

•A 3-D heterogeneous model for CO2 absorption is developed.•The presence of carbon nanotubes enhances CO2 absorption.•Nanotube's size has a substantial effect on CO2 absorption.•The enhancement of CO2 absorption depends on nanotubes' adsorption capacity. The absorption of CO2 is of vital i...

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Bibliographic Details
Published in:Applied thermal engineering 2016-04, Vol.99, p.1246-1253
Main Authors: Koronaki, I.P., Nitsas, M.T., Vallianos, Ch. A.
Format: Article
Language:English
Subjects:
Absorption
Carbon dioxide
Nanoparticles
Nanotubes
Numerical analysis
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Summary:•A 3-D heterogeneous model for CO2 absorption is developed.•The presence of carbon nanotubes enhances CO2 absorption.•Nanotube's size has a substantial effect on CO2 absorption.•The enhancement of CO2 absorption depends on nanotubes' adsorption capacity. The absorption of CO2 is of vital importance considering the environmental aspects that rise through its emissions. A lot of studies have been conducted regarding the maximization of the CO2 absorption. A way to do that is by adding fine nanoparticles to the liquid bulk. In this paper a model was developed in order to determine how absorption enhancement changes for different particle loadings, particle adsorption capacities, initial concentrations and particle diameters. Diffusion equation was solved numerically with FDM (Finite Difference Method) using MATLAB computing language. It is found that nanoparticles do enhance absorption and particle adsorption capacity has a positive impact on enhancement factor, whereas particle size and concentration have an optimum for maximum absorption enhancement.
ISSN:1359-4311
DOI:10.1016/j.applthermaleng.2016.02.030