Permeability of porous media: Role of the critical pore size
Permeability of porous media: Role of the critical pore size
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DOI：
10.1002/2016jb013793
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发表时间：
2017-09-01
影响因子：
3.9
通讯作者：
Yokoyama, Tadashi
中科院分区：
文献类型：
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作者：
Nishiyama, Naoki;Yokoyama, Tadashi
对多孔介质渗透性的了解对于理解各种天然和人造材料中的流体流动是至关重要的。由于孔隙结构的复杂性，决定渗透率的孔隙特征(孔隙度和孔隙半径)一直是人们讨论的问题。在这里，我们使用排水法确定了临界孔隙半径，这是可以自由通过多孔介质的最大球体的半径。排水法是一种测量气体通过饱和水的多孔介质的压力的实验技术。我们证明了临界孔隙半径与各种孔隙度(0.71%-50%)和渗透率(10(-20)-10(-10)m(2))的多孔颗粒介质和火山产品的渗透率有很好的相关性。我们还得到了孔隙度-临界孔隙半径-渗透率关系，与以前的关联式预测相比，该关系式提供了更好的渗透率预测。
The knowledge of the permeability of porous media is crucial to understand fluid flow in various natural and artificial materials. Due to the complex nature of pore structure, the pore characteristic (porosity and pore radius) determining the permeability has long been under discussion. Here we determined the critical pore radius, which is the radius of the largest sphere that can freely pass through a porous medium, using the water expulsion method, an experimental technique measuring the pressure at which gas passes through a water-saturated porous medium. We demonstrate that the critical pore radius correlates well with the permeability for a variety of porous granular media and volcanic products with an extensive range of porosities (0.71%-50%) and permeabilities (10(-20)-10(-10)m(2)). We also obtained a porosity-critical pore radius-permeability relationship that provides a better prediction of the permeability compared with predictions obtained by previous correlations.