Experimental and theoretical investigations of drainage in horizontal rough-walled fractures with different correlation structures
Experimental and theoretical investigations of drainage in horizontal rough-walled fractures with different correlation structures
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DOI：
10.1016/j.advwatres.2004.07.005
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发表时间：
2004-12
影响因子：
4.7
通讯作者：
I. Neuweiler;I. Sorensen;W. Kinzelbach
中科院分区：
文献类型：
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作者：
I. Neuweiler;I. Sorensen;W. Kinzelbach
在两条不同对比结构的水平人工开放粗糙缝中进行了空气非混相驱替水实验。第一条裂缝的孔径场具有有限相关长度的高斯变差函数，而第二条裂缝的孔径场具有幂律变差函数，不能为其分配有限的相关长度。我们模拟的驱替过程中使用的侵入渗流模型，其中考虑了水和空气之间的界面的面内曲率。孔径场的相关结构对空气团簇形状的不规则性没有影响。然而，与面内曲率相结合的相关结构会影响空气团簇的密度，从而对流的特征性质产生影响。我们分析了模型参数和属性相对于断裂属性。然后计算了不同曲率数和不同相关长度的模式的空气团的随机平均值，以分析它们对连续近似模式的影响。
Experiments on the immiscible displacement of water by air were performed in two horizontal artificial open rough-walled fractures with different correlation structures. The aperture field of the first fracture has a Gaussian variogram with a finite correlation length, while that of the second one has a power-law variogram, for which no finite correlation length can be assigned. We simulated the displacement process using an invasion percolation model, which takes the in-plane curvature of the interface between water and air into account. The correlation structure of the aperture field has no effect on the irregularity of the shape of the air clusters. However, the correlation structure in combination with the in-plane curvature influences the density of the air clusters and thus has an impact on characteristic properties of the flow. We analyze the model parameters and properties with respect to the fracture properties. The stochastic average of the air clusters for models with different curvature numbers and fields with different correlation lengths is then calculated in order to analyze their influence on continuum approach models.