A reliable and practical method of hygric property characterisation is a major determinant in properly analysing hygric performance of built constructions. The current empirical approach, however, yields data that are still incomplete, not fully representative, and not entirely reliable. In this study, hygric properties are therefore determined directly from pore structure information by applying stationary unsaturated pore-scale physics to model moisture storage and transport. The pore space is captured by visualisation techniques and further extracted into a discrete network of variably shaped pore bodies interconnected by pore throats. In this network, corner and surface adsorption and capillary condensation are simulated to define the moisture storage. Air entrapment is furthermore considered to determine the capillary moisture content. The resulting spatial moisture distribution in the pore network allows moisture to flow, in wet elements in the liquid phase and in dry elements in the vapour phase. The adsorbed corner and surface films moreover enable additional liquid flow. These various simultaneous flows aggregately define the transport property. A comparison to measured data validates the presented hygric property model.

中文翻译：

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基于孔结构的多孔材料不饱和吸湿性能测定

一种可靠且实用的吸湿特性表征方法是正确分析建筑结构吸湿性能的主要决定因素。然而，当前的实证方法产生的数据仍然不完整、不完全具有代表性且不完全可靠。因此，在本研究中，通过应用静态不饱和孔隙尺度物理学来模拟水分储存和运输，可直接根据孔隙结构信息确定吸湿特性。孔隙空间被可视化技术捕获，并进一步提取到由孔喉互连的各种形状的孔体组成的离散网络中。在这个网络中，模拟角落和表面吸附以及毛细管冷凝来定义水分储存。此外，还考虑空气滞留来确定毛细管水分含量。由此产生的孔隙网络中的空间水分分布允许水分在液相中的湿元素和气相中的干元素中流动。此外，被吸附的角部和表面膜使额外的液体流动成为可能。这些不同的并发流共同定义了传输特性。与测量数据的比较验证了所提出的吸湿性模型。