论文标题
在分层的多孔媒体中强制吸收
Forced Imbibition in Stratified Porous Media
论文作者
论文摘要
吸收在各种能源，环境和工业过程中起着核心作用。在许多情况下，培养基具有不同的渗透率的多个平行地层。但是，这种分层如何影响吸气的理解很少。我们通过直接在具有两个平行地层的三维（3D）多孔介质中直接可视化强制吸收来解决这一差距。我们发现吸气在空间上是异质的：对于小毛细管数Ca，润湿流体优先侵入细层，而对于高于阈值的Ca，则流体优先侵入粗层。该阈值值取决于中等几何形状，流体特性以及孔隙空间中残留润湿膜的存在。这些发现通过线性稳定性分析很好地描述了，该分析结合了地层之间的跨流。因此，我们的工作提供了用于预测分层多孔介质流量的定量指南。
Imbibition plays a central role in diverse energy, environmental, and industrial processes. In many cases, the medium has multiple parallel strata of different permeabilities; however, how this stratification impacts imbibition is poorly understood. We address this gap in knowledge by directly visualizing forced imbibition in three-dimensional (3D) porous media with two parallel strata. We find that imbibition is spatially heterogeneous: for small capillary number Ca, the wetting fluid preferentially invades the fine stratum, while for Ca above a threshold value, the fluid instead preferentially invades the coarse stratum. This threshold value depends on the medium geometry, the fluid properties, and the presence of residual wetting films in the pore space. These findings are well described by a linear stability analysis that incorporates crossflow between the strata. Thus, our work provides quantitative guidelines for predicting and controlling flow in stratified porous media.
