Dissolution-driven convection of low solubility fluids in porous media
Dissolution-driven convection of low solubility fluids in porous media
复制标题
DOI：
10.1016/j.ijheatmasstransfer.2023.124624
复制
发表时间：
2023-12
影响因子：
5.2
通讯作者：
Qian Li;Zijie Lin;W. Cai;Ching-Yao Chen;E. Meiburg
中科院分区：
文献类型：
--
作者：
Qian Li;Zijie Lin;W. Cai;Ching-Yao Chen;E. Meiburg
地质封存是一种很有前途的储存二氧化碳的策略。为了进一步阐明这一过程，我们基于一种新的Darcy-Cahn-Hilliard模型，模拟了多孔介质中具有自由界面的二氧化碳-盐水体系的溶解驱动对流，该模型解释了二氧化碳与盐水的低溶解度。我们考虑了一系列不稳定瑞利数Ra，并导出了无因次溶质通量的定量关系。这种通量在流动的各个阶段表现出明显不同的行为。特别是在自由对流阶段，较大的Ra值会导致溶质通量的适度减少，而在恒定通量阶段，溶质通量与Ra基本无关。为了评估关闭阶段的溶质通量，我们采用了双面rayleigh - bsamadard单元结构的模拟。考虑到底边界的阻尼效应，修正系数a= 0.67，该模型能够再现停流阶段的溶质通量。通过考虑到部分混相的影响，本文开发的模拟方法有可能对二氧化碳封存和相关应用的溶质通量产生更准确的估计。
Geological sequestration represents a promising strategy for storing C O 2. In order to further elucidate this process, we simulated the dissolution-driven convection of a C O 2-brine system with a free interface in a porous medium, based on a novel Darcy-Cahn-Hilliard model that accounts for the low solubility of C O 2 with brine. We consider a range of unstable Rayleigh numbers Ra, and we derive a quantitative relationship for the dimensionless solute flux. This flux exhibits distinctly different behaviors during the various stages of the flow. In particular, during the free convection stage, larger Ra-values result in a moderate decrease of the solute flux, while the solute flux is approximately independent of Ra during the constant flux stage. In order to evaluate the solute flux during the shutdown stage, we employ simulations in the two-sided Rayleigh-Bénard cell configuration. With a correction factor a= 0.67 to account for the damping effect of the bottom boundary, the model can reproduce the solute flux during the shutdown stage. By accounting for the effects of partial miscibility, the simulation approach developed here holds the potential to yield more accurate estimates of the solute flux in the context of C O 2 sequestration and related applications.