Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J23: Convection and Buoyancy-Driven Flows: General II
4:35 PM–6:32 PM,
Sunday, November 19, 2023
Room: 149AB
Chair: Chunendra Sahu, IIT Kanpur
Abstract: J23.00003 : Diffusive and convective dissolution of carbon dioxide in a vertical cylindrical cel*
5:01 PM–5:14 PM
Presenter:
Daniël P Faasen
(University of Twente)
Authors:
Daniël P Faasen
(University of Twente)
Farzan Sepahi
(University of Twente)
Dominik Krug
(Univ of Twente)
Roberto Verzicco
(Univ of Roma Tor Vergata)
Pablo Peñas
(University of Twente)
Detlef Lohse
(University of Twente)
Devaraj van der Meer
(Univ of Twente)
The dissolution and subsequent mass transfer of carbon dioxide gas into liquid barriers plays a vital role in many environmental and industrial applications. In our work, we study the downward dissolution and propagation dynamics of CO2 into a vertical water barrier confined to a narrow vertical glass cylinder, using both experiments and direct numerical simulations. Initially, the dissolution of CO2 results in the formation of a CO2-rich water layer, which is denser in comparison to pure water, at the top gas-liquid interface. Continued dissolution of CO2 into the water barrier results in the layer becoming gravitationally unstable, leading to the onset of buoyancy driven convection and, consequently, the shedding of a buoyant plume. By adding sodium fluorescein, a pH-sensitive fluorophore, we directly visualise the dissolution and propagation of the CO2 across the liquid barrier. Tracking the CO2 front propagation in time results in the discovery of two distinct transport regimes, a purely diffusive regime and an enhanced diffusive regime. Using direct numerical simulations, we are able to successfully explain the propagation dynamics of these two transport regimes in this laterally strongly confined geometry, namely by disentangling the contributions of diffusion and convection to the propagation of the CO2 front.
*This work was supported by the Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC).
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