Percolation and Grain Boundary Wetting in Anisotropic Texturally Equilibrated Pore Networks
Percolation and Grain Boundary Wetting in Anisotropic Texturally Equilibrated Pore Networks
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DOI：
10.1103/physrevlett.113.048001
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发表时间：
2014-07-25
影响因子：
8.6
通讯作者：
Hesse, Marc A.
中科院分区：
文献类型：
--
作者：
Ghanbarzadeh, Soheil;Prodanovic, Masa;Hesse, Marc A.
在纹理平衡的多孔介质中，孔隙几何形状演变以使液-固界面的能量最小化，同时保持固-固-液接触线处的二面角θ。我们提出了使用水平集方法计算三维纹理平衡的孔隙网络。研究结果表明，即使θ> 0，孔隙流体也可以完全润湿面积最小的晶界。这在以前被认为是不可能的，在纹理平衡和调和理论与实验观察。即使多孔介质的织物中的小的各向异性也允许在非常低的孔隙率（Φ 60度）下润湿这些面< 3%. Percolation and orientation of the wetted faces relative to the anisotropy of the fabric are controlled by theta. The wetted grain boundaries are perpendicular to the direction of stretching for theta >，并且对于任何研究的Φ，孔都不会渗透。与此相反，对于θ < 60度，平行于拉伸方向的晶界被润湿，并且对于所有研究的φ，形成了膨胀的孔隙网络。在低θ时，由于晶界和表面上的液体浓度，织物中即使很小的各向异性也会引起渗透率的大的各向异性。
In texturally equilibrated porous media the pore geometry evolves to minimize the energy of the liquid-solid interfaces, while maintaining the dihedral angle theta at solid-solid-liquid contact lines. We present computations of three-dimensional texturally equilibrated pore networks using a level-set method. Our results show that the grain boundaries with the smallest area can be fully wetted by the pore fluid even for theta > 0. This was previously not thought to be possible at textural equilibrium and reconciles the theory with experimental observations. Even small anisotropy in the fabric of the porous medium allows the wetting of these faces at very low porosities, phi < 3%. Percolation and orientation of the wetted faces relative to the anisotropy of the fabric are controlled by theta. The wetted grain boundaries are perpendicular to the direction of stretching for theta > 60 degrees and the pores do not percolate for any investigated phi. For theta < 60 degrees, in contrast, the grain boundaries parallel to the direction of stretching are wetted and a percolating pore network forms for all phi investigated. At low theta even small anisotropy in the fabric induces large anisotropy in the permeability, due to the concentration of liquid on the grain boundaries and faces.