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化工学报  2015 

颗粒堆积型多孔介质内部液体形态实验研究及机理分析

DOI: 10.11949/j.issn.0438-1157.20141667, PP. 2450-2455

Keywords: 多孔介质,介尺度,形态,接触角,临界含湿率

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Abstract:

实验研究了不同含湿率时堆积颗粒聚集状态和试样表观体积的变化,并分析了内在影响机理。含湿率较低时液体在试样内部的主要存在形式为液桥,含湿率较高时液体主要以联通液的形式存在,两种形态水分发生转换的临界含湿率由水在颗粒表面的表观接触角决定。试样内部液体形态及分布的演化,导致液体对颗粒的作用力发生变化,进而影响颗粒的聚集状态以及试样的宏观表观体积变化。利用建立的模型推导了液体形态发生转换的临界含湿率与表观接触角之间的函数关系,计算结果与实验具有较好的一致性。

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