渗吸
多孔介质
润湿
地层
分层(种子)
毛细管作用
多孔性
工作(物理)
机械
材料科学
地质学
岩土工程
物理
热力学
复合材料
发芽
种子休眠
生物
植物
休眠
作者
Nancy Lu,Amir A. Pahlavan,Christopher Browne,Daniel B. Amchin,Howard A. Stone,Sujit S. Datta
出处
期刊:Physical review applied
[American Physical Society]
日期:2020-11-05
卷期号:14 (5)
被引量:7
标识
DOI:10.1103/physrevapplied.14.054009
摘要
Imbibition in a porous medium 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 porous media with two parallel strata. We find that imbibition is spatially heterogeneous: for a 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.
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