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Convective dissolution of CO2 in water and salt solutions

Author

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  • Carelle Thomas
  • Sam Dehaeck
  • Anne De Wit

Abstract

Dissolution of CO2 into saline aquifers can lead to the development of buoyancy-driven convection in the brine which enhances the efficiency of CO2 transfer. We analyze here experimentally the onset, development and dynamic properties of such convective fingering of CO2 into water, Antarctic water and in NaCl salt solutions of various concentrations to study the influence of varying the salt concentration on the buoyancy-driven convective dynamics. The convective dissolution pattern is visualized with the help of a schlieren imaging system sensitive to density gradients in the solution. We quantify the growth of convective fingers by performing, among others, a Fourier analysis of the pattern formation at early times and qualitatively study the nonlinear spatio-temporal dynamics at later times. In agreement with theoretical predictions, we find that increasing the salt concentration hinders the development of the instability as it delays the onset of convection, increases the wavelength of the convective pattern, decreases the growth rate and velocity of fingers as well as their interactions. Our experimental results provide quantitative data that should help the benchmarking of theoretical studies.

Suggested Citation

  • Carelle Thomas & Sam Dehaeck & Anne De Wit, 2018. "Convective dissolution of CO2 in water and salt solutions," ULB Institutional Repository 2013/270512, ULB -- Universite Libre de Bruxelles.
  • Handle: RePEc:ulb:ulbeco:2013/270512
    Note: SCOPUS: ar.j
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    Cited by:

    1. Widuramina Sameendranath Amarasinghe & Ingebret Fjelde & Anna Maija Nørstebø Flaata, 2021. "Visual investigation of CO2 dissolution and convection in heterogeneous porous media at reservoir temperature and pressure conditions," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 11(2), pages 342-359, April.
    2. Widuramina Amarasinghe & Ingebret Fjelde & Nils Giske & Ying Guo, 2021. "CO 2 Convective Dissolution in Oil-Saturated Unconsolidated Porous Media at Reservoir Conditions," Energies, MDPI, vol. 14(1), pages 1-13, January.
    3. Eigbe, Patrick A. & Ajayi, Olatunbosun O. & Olakoyejo, Olabode T. & Fadipe, Opeyemi L. & Efe, Steven & Adelaja, Adekunle O., 2023. "A general review of CO2 sequestration in underground geological formations and assessment of depleted hydrocarbon reservoirs in the Niger Delta," Applied Energy, Elsevier, vol. 350(C).

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