Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J33: Porous Media Flows: Theory
4:35 PM–6:32 PM,
Sunday, November 19, 2023
Room: 159AB
Chair: Mostafa Aghaei Jouybari, Johns Hopkins University
Abstract: J33.00003 : Effects of the geothermal gradient on the convective dissolution in CO2 sequestration*
5:01 PM–5:14 PM
Presenter:
Chenglong Hu
(Peking Univ)
Authors:
Chenglong Hu
(Peking Univ)
Ke Xu
(Peking Univ)
Yantao Yang
(Peking Univ)
We use thermal (RaT) and concentration Rayleigh numbers (RaS) to measure convection intensity. Direct numerical simulations are conducted in porous media at three RaS values from 103 to 104 with a series of RaT up to 300 for each RaS.
Simulations reveal that intensified thermal gradient creates large-scale convection rolls, consequently influencing the horizontal distribution and motions of concentration fingers. All simulations eventually reach a shutdown regime, for which we developed a theoretical model to successfully describe concentration flux and volume averaged concentration. The maximum increment of dissolved CO2 occurs at around unity density ratio for all RaS values, which is likely attributed to the two competing effects of the thermal field.
Our results provide a novel perspective on convective dissolution and indicate that the geothermal gradient may play a non-negligible role in many CO2-sequestration sites.
*Financial support: Laoshan Laboratory (Grant No. LSKJ202202000), National Natural Science Foundation of China (Grant No. 12172010), and China National Petroleum Corporation-Peking University Strategic Cooperation Project of Fundamental Research.
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