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Interfacial area measurements for unsaturated flow through a porous medium

机译：通过多孔介质的非饱和流的界面面积测量

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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.
机译：流体-流体界面的存在强烈影响多孔介质中的多相流和污染物传输。基于守恒定律和热力学第二定律的最新理论工作表明，需要将定量的界面面积信息纳入多相流模型。我们已经使用基于同步加速器的X射线断层摄影技术来研究通过玻璃珠柱的不饱和流动。在主要排水曲线以及次要吸水和排水环路上的点处收集了完整的三维图像。对高分辨率图像（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，流体界面面积随着饱和度的降低而增加，在饱和度为20％至35％时达到最大值，然后随着饱和度继续为零而减小。这些发现支持了文献报道的数值研究结果。

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