Interfacial area measurements for unsaturated flow through a porous medium
Interfacial area measurements for unsaturated flow through a porous medium
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DOI：
10.1029/2004wr003278
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发表时间：
2004-12-22
影响因子：
5.4
通讯作者：
Tompson, AFB
中科院分区：
文献类型：
--
作者：
Culligan, KA;Wildenschild, D;Tompson, AFB
多孔介质中的多相流动和污染物输运受到流体-流体界面的强烈影响。最近的理论工作的基础上守恒定律和热力学第二定律表明，需要定量的界面面积信息被纳入多相流模型。我们已经使用基于同步加速器的X射线显微断层摄影术，调查通过玻璃珠柱的不饱和流动。在主要引流曲线上的点和次要吸胀和引流环路上收集全三维图像。高分辨率图像（17微米体素）的分析允许计算界面面积和饱和度。在实验过程中进行相应的压力测量。结果表明，流体-流体界面面积增加的饱和度降低，达到最大值的饱和度范围从20至35%，然后随着饱和度继续下降到零。研究结果支持文献中报道的数值研究结果。
Multiphase flow and contaminant transport in porous media are strongly influenced by the presence of fluid-fluid interfaces. Recent theoretical work based on conservation laws and the second law of thermodynamics has demonstrated the need for quantitative interfacial area information to be incorporated into multiphase flow models. We have used synchrotron based X-ray microtomography to investigate unsaturated flow through a glass bead column. Fully three-dimensional images were collected at points on the primary drainage curve and on the secondary imbibition and drainage loops. Analysis of the high-resolution images (17 micron voxels) allows for computation of interfacial areas and saturation. Corresponding pressure measurements are made during the course of the experiments. Results show the fluid-fluid interfacial area increasing as saturation decreases, reaching a maximum at saturations ranging from 20 to 35% and then decreasing as the saturation continues to zero. The findings support results of numerical studies reported in the literature.