论文标题
气泡成核和多孔介质迁移的孔量表研究
Pore Scale Study of Gas Bubble Nucleation and Migration in Porous Media
论文作者
论文摘要
多孔介质中气泡的行为包括气泡成核和生长，迁移，结合和捕获。这些过程受到沉积物的孔尺度特征和异质性的显着影响。在这项研究中，使用微流体芯片进行实验，其中观察到不同的气泡行为机制。基于微观实验，确定了八种主要的气泡行为机制。此外，设计和执行了一个中尺度实验，以研究土壤分层和异质性对通过反硝化产生生物气体产生的形成和分布的影响。结果表明，土壤的孔尺度特征显着影响生物气泡的分布和迁移模式。结果，水饱和度可能在完全饱和（以细沙）之间的局部变化，到允许气体自由迁移（粗砂）的区域中约80％，甚至在较高空气进入值的层中被困在层中的区域中甚至接近0％。
The behavior of gas bubbles in porous media includes bubble nucleation and growth, migration, coalescence, and trapping. These processes are significantly affected by the pore-scale characteristics and heterogeneity of the sediment. In this study, experiments are performed using a microfluidic chip in which different gas bubble behavior mechanisms are observed. Based on the microscale experiments, eight major gas bubble behavior mechanisms are identified. In addition, a mesoscale experiment is designed and performed to study the impacts of soil layering and heterogeneity on the formation and distribution of biogenic gas generation via denitrification. The results show that the pore-scale characteristics of soil significantly affect the distribution and migration pattern of biogenic gas bubbles. As a result, the water saturation may vary locally between fully saturated (in fine sand), to about 80% in zones where the gas is allowed to migrate freely (coarse sand), to even close to 0% in the zone where the gas gets trapped under layers with higher air entry value.
