Abstract
This paper presents the volumetric liquid phase mass transfer coefficients for the flow of distilled water-carbon dioxide in a horizontal rectangular microchannel. The microchannel has a cross-section of 200×400 µm and a T-shaped inlet mixer. Visualization of flow regimes and measurement of bubble shapes were carried out using a high-speed video camera Optronis CR600x2 at the area on flow formation and near the channel outlet. The mass transfer for bubbly and elongated bubble flows was investigated. The unit cell model was used for the estimation of the volumetric liquid phase mass transfer coefficient. It was obtained that for bubbly flow, the volumetric mass transfer coefficient during physical absorption of CO2 is lower than for the elongated bubble flow due to the absence of the thin liquid film between the bubble and channel wall. Comparison of the experimental data with the correlation developed for chemical absorption showed a good agreement for elongated bubble flow.
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