Abstract Carbon dioxide capture and storage is an efficient technology to reduce CO2. A candidate CO2 reservoir is a sub-seabed aquifer under the cap rock. However, there is a risk of CO2 leakage even though such probability is low. Once CO2 seeps at the seafloor, it forms bubbles/droplets and dissolves during their rise. The rising speed and the dissolution rate significantly depend on the bubble/droplet size. Interestingly, past observations of natural seepage of CO2 indicated that the bubble/droplet sizes were not very different, regardless of the seepage depths. In this study, a numerical method to simulate 3D solid-liquid-gas three-phase flow in the unconsolidated particle layers was developed and applied to elucidate the influences of gas flux, porosity, and particle size on the formations of gas channels and subsequent bubbles. The results suggested that the bubble size did not depend on the flux, but on the gas channel size at the level of gas flux expected in possible seepage events.

中文翻译：

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使用耦合 LBM-DEM 方法对松散沙质海底沉积物中气道和后续气泡形成的数值研究

摘要 二氧化碳捕集与封存是一种有效的二氧化碳减排技术。候选 CO2 储层是盖层下的海底含水层。然而，即使这种概率很低，也存在 CO2 泄漏的风险。一旦二氧化碳渗入海底，就会形成气泡/液滴，并在上升过程中溶解。上升速度和溶解速率显着取决于气泡/液滴尺寸。有趣的是，过去对 CO2 自然渗流的观察表明，无论渗流深度如何，气泡/液滴的大小都没有太大差异。在这项研究中，开发了一种模拟松散颗粒层中 3D 固-液-气三相流动的数值方法，并应用于阐明气体通量、孔隙率和颗粒尺寸对气体通道和后续气泡形成的影响.