Real-time 3D imaging of Haines jumps in porous media flow
Real-time 3D imaging of Haines jumps in porous media flow
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DOI：
10.1073/pnas.1221373110
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发表时间：
2013-03-05
影响因子：
11.1
通讯作者：
Stampanoni, Marco
中科院分区：
文献类型：
--
作者：
Berg, Steffen;Ott, Holger;Stampanoni, Marco
新开发的高速，同步加速器为基础的X射线计算机显微层析成像，使我们能够直接图像孔隙规模的位移事件在多孔岩石在真实的时间。模拟宏观流体行为的常用方法是唯象的，有许多缺点，并且缺乏与基本孔隙尺度位移过程（如海恩斯跳跃和折断）的一致联系。与基于受限人工毛细管观察的常见奇异孔跳跃范例不同，我们发现海恩斯跳跃通常级联通过每个事件10-20个几何定义的孔，占能量耗散的64%。实时成像提供了一个更详细的多孔介质中的基本过程，如滞后，跳脱，和非润湿相截留的基本理解，它开辟了一个严格的过程，基于热力学模型放大的方式。
Newly developed high-speed, synchrotron-based X-ray computed microtomography enabled us to directly image pore-scale displacement events in porous rock in real time. Common approaches to modeling macroscopic fluid behavior are phenomenological, have many shortcomings, and lack consistent links to elementary pore-scale displacement processes, such as Haines jumps and snap-off. Unlike the common singular pore jump paradigm based on observations of restricted artificial capillaries, we found that Haines jumps typically cascade through 10-20 geometrically defined pores per event, accounting for 64% of the energy dissipation. Real-time imaging provided a more detailed fundamental understanding of the elementary processes in porous media, such as hysteresis, snap-off, and nonwetting phase entrapment, and it opens the way for a rigorous process for upscaling based on thermodynamic models.