A comprehensive experimental protocol is presented for the characterization of physico-chemical and morphological properties of absorbent hygiene products (AHPs), composite materials, mainly made of super absorbent polymer (SAP) granules blended with cellulose fibres (fluff). The protocol is based on a combination of experimental methods for the characterization of the material properties varying SAP/fluff ratio (SFR): absorption rate, porosity, hydraulic conductivity, retention model and swelling. Major findings were that: (1) liquid absorption rate by the SAP particles was nonlinear; (2) the hydraulic conductivity could be expressed as a function of the porosity of the composite medium for any sample and liquid uptake; and (3) the retention model showed moderate variability with SFR, in the range investigated. Experimental results have been used to determine the constitutive equations for the multiphase flow model developed in the literature (Diersch et al. in Theory Transp Porous Media 83:437–464, 2010. 10.1007/s11242-009-9454-6) for the prediction of the performance of AHPs during cycles of imbibition and drainage (Chem Eng Sci 224:115765, 2020. 10.1016/j.ces.2020.115765).

中文翻译：

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吸收性和膨胀性多孔介质中不饱和流的建模和实验表征：材料表征

提出了一种综合实验方案，用于表征吸水性卫生产品 (AHP)、复合材料的物理化学和形态特性，主要由与纤维素纤维（绒毛）混合的高吸水性聚合物 (SAP) 颗粒制成。该协议基于实验方法的组合，用于表征不同 SAP/绒毛比 (SFR) 的材料特性：吸收率、孔隙率、水力传导率、保留模型和膨胀。主要发现有：（1）SAP颗粒对液体的吸收率是非线性的；(2) 水力传导率可以表示为任何样品和液体吸收的复合介质孔隙率的函数；(3) 在所研究的范围内，保留模型显示出随 SFR 的适度变异性。