多孔材料水力学特性孔隙网络模型的微观验证

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL
Daan Deckers, Hans Janssen
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引用次数: 0

摘要

在孔隙网络模型中,微观的水分储存和输送过程在孔隙水平上建模,然后将这些信息外推,以获得描述材料水分行为的宏观特性。这种模型通常通过比较测量和模拟的宏观特性来验证。然而,由于与实验性质确定相关的不确定性,对模型微观过程的可能不正确的描述可以被忽略。因此,评估模型在孔隙水平上正确模拟水分行为的能力是其完整验证所必需的。为此,利用x射线计算机断层扫描图像对非饱和材料单个孔隙中的水分进行了成像,并与孔隙网络模型模拟的水分分布进行了比较。所获得的x射线计算机断层扫描图像清楚地显示了干燥过程的演变,其中空孔隙在其不规则形状的角落中保留了水分。虽然有些角落不储存任何水分,但其他角落允许最大10%的毛孔体积被填充。然而,通过将这些图像与孔隙网络模型进行比较,我们可以清楚地看到,在目前的模型实现中,被困在这些孔隙角落的水量被严重高估了。由于这种实现方法在现有孔隙网络模型中是常用的,因此本文证明需要对真实多孔介质中的角岛进行详细的研究,以形成一种不同的计算孔隙角含水量的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Microscopic Validation of a Pore Network Model for Hygric Properties of Porous Materials

Microscopic Validation of a Pore Network Model for Hygric Properties of Porous Materials

In a pore network model, microscopic moisture storage and transport processes are modeled at pore level after which this information is extrapolated to obtain macroscopic properties describing the material’s moisture behavior. Such a model is typically validated by comparing measured and simulated macroscopic properties. However, due to the uncertainty associated with the experimental property determination, a possibly incorrect description of the model’s microscopic processes can be overlooked. Assessing the model’s ability to correctly simulate the moisture behavior at pore level is therefore required for its complete validation. To this aim, the moisture stored in the individual pores of unsaturated materials is imaged with the help of X-ray computed tomography images and compared to the moisture distribution simulated with a pore network model. The acquired X-ray computed tomography images clearly show the evolution of the drying process, wherein emptied pores retain water in their irregularly shaped corners. While some corners do not store any moisture, others allow a maximum of 10 % of the pore’s volume to be filled with corner islands. By comparing these images with the pore network model, however, it becomes clear that the amount of water, trapped in these pore corners is heavily overestimated in the model’s current implementation. Since this implementation is commonly used in existing pore network models, this paper proves the need of a detailed investigation of the corner islands in real porous media to formulate a different way of calculating moisture storage in pore corners.

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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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