Improved Interpretation of Mercury Intrusion and Soil Water Retention Percolation Characteristics by Inverse Modelling and Void Cluster Analysis
Improved Interpretation of Mercury Intrusion and Soil Water Retention Percolation Characteristics by Inverse Modelling and Void Cluster Analysis
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DOI：
10.1007/s11242-018-1087-1
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发表时间：
2018
影响因子：
2.7
通讯作者：
G. Peter Matthews;C. L. Levy;G. Laudone;Katie L. Jones;Cathy Ridgway;I. Hallin;S. Andrea Gazze;L. Francis;W. Richard Whalley;J. Schoelkopf;P. Gane
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文献类型：
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作者：
G. Peter Matthews;C. L. Levy;G. Laudone;Katie L. Jones;Cathy Ridgway;I. Hallin;S. Andrea Gazze;L. Francis;W. Richard Whalley;J. Schoelkopf;P. Gane
这项工作解决了解释多孔固体渗流特性的两个持续的谬误。第一种是非润湿流体的侵入特性或润湿流体的排水特性的一阶导数(斜率)对应于孔隙尺寸分布，第二种是可以测量所有孔隙的尺寸。谬误在PoreXpert®逆向建模程序包的帮助下进行了说明。然后描述了一种新的空洞分析方法，它是逆模拟程序包的一个附加程序，解决了第二个谬误。它被应用于三种差异很大且具有挑战性的多孔介质。第一种材料包括两种用于下一代核反应堆的细粒石墨。它们的较大空隙尺寸是通过汞侵入测量来测量的，而最小空隙尺寸是通过使用表面积测量的宏正则蒙特卡罗解释(精确到纳米尺度)来测量的。第二种应用是一系列被称为功能化碳酸钙(FCC)的研磨碳酸钙和粉末微孔碳酸钙的混合物的汞侵入。第三个是土壤样品的保水/排水特性，它经历了自然发生的亲水/疏水转变。一阶导数近似对两种石墨的压汞孔隙度的解释是合理的，它们只在低压汞侵入时有所不同，而对于面心立方和瞬时疏水土壤则是错误的。这些发现得到了其他实验特征的支持，特别是电子显微镜和原子力显微镜。
This work addresses two continuing fallacies in the interpretation of percolation characteristics of porous solids. The first is that the first derivative (slope) of the intrusion characteristic of the non-wetting fluid or drainage characteristic of the wetting fluid corresponds to the void size distribution, and the second is that the sizes of all voids can be measured. The fallacies are illustrated with the aid of the PoreXpert®inverse modelling package. A new void analysis method is then described, which is an add-on to the inverse modelling package and addresses the second fallacy. It is applied to three widely contrasting and challenging porous media. The first comprises two fine-grain graphites for use in the next-generation nuclear reactors. Their larger void sizes were measured by mercury intrusion, and the smallest by using a grand canonical Monte Carlo interpretation of surface area measurement down to nanometre scale. The second application is to the mercury intrusion of a series of mixtures of ground calcium carbonate with powdered microporous calcium carbonate known as functionalised calcium carbonate (FCC). The third is the water retention/drainage characteristic of a soil sample which undergoes naturally occurring hydrophilic/hydrophobic transitions. The first-derivative approximation is shown to be reasonable in the interpretation of the mercury intrusion porosimetry of the two graphites, which differ only at low mercury intrusion pressures, but false for FCC and the transiently hydrophobic soil. The findings are supported by other experimental characterisations, in particular electron and atomic force microscopy.