Dynamic capillary fringes - a multidisciplinary approach

动态毛细管边缘 - 多学科方法

• 批准号: 190117701
• 负责人: Professor Dr. Helmut Geistlinger
• 金额: --
• 依托单位: Department Bodensystemforschung
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/190117701?language=en
• 关键词: Dynamic; capillary; fringes; multidisciplinary; approach

The capillary fringe is characterized by the fluctuating water table evoking the dynamic formation and dissolution of trapped gas. Due to phase discontinuities flow and transport across this interface cannot be described by classical theory. In this sub-project we want to (I) experimentally explore the dynamics of phase saturation during water table fluctuations at a high spatial (0.01 mm) and high temporal (1 s) resolution using X-ray radiography, (ii) investigate the formation and dissolution of a residual gas phase under transient forcing, and (iii) study incoherent gas transport and the extent to which it may be represented by travel time distributions and effective continuum properties. The experiments will be run in Hele- Shaw cells corresponding to the other SPs. The continuum scale analysis will be complemented by optical measurements of the dynamics of water-gas interfaces and the movement and size distribution of gas bubbles at the pore scale (resolution 0.01 mm). Using 3D X-ray tomography the structure of the pore geometry is obtained which provides the basis for pore scale modeling of the dissolution of gas bubbles (SP2). Moreover, the pore structure will be quantified in terms of pore size distribution, connectivity and pore-solid interface curvature. These measures are then used as input to an equivalent micro-model where the detailed multiphase dynamics can be explored. This will provide the experimental basis to relate structural properties, external forcing and fluid properties to effective properties observed in the central experimental facility of CP.

毛细管边缘的特征是地下水位的波动引起了封闭气体的动态形成和溶解。由于相的不连续性，通过该界面的流动和输运不能用经典理论描述。在这个子项目中，我们想（I）实验探索在高空间水位波动期间相饱和度的动态（0.01毫米）和高时间（1秒）分辨率使用X射线照相术，（ii）调查的形成和溶解的残余气相下瞬态强迫，和（iii）研究非相干气体输运及其在何种程度上可以由传播时间分布和有效连续性质来表示。实验将在对应于其他SP的Hele-Shaw细胞中进行。连续尺度分析将辅之以水-气界面动态的光学测量以及孔隙尺度（分辨率0.01毫米）气泡的运动和尺寸分布。使用3D X射线层析成像的孔隙几何结构的获得，这提供了气泡（SP2）的溶解的孔隙尺度建模的基础。此外，将根据孔径分布、连通性和孔-固体界面曲率来量化孔结构。这些措施，然后被用作输入到一个等效的微观模型，其中详细的多相动力学可以探索。这将为把结构特性、外力和流体特性与CP中心实验装置中观测到的有效特性联系起来提供实验基础。