Non-equilibrium modeling hysteresis of water freezing: Ice thawing in partially saturated porous building materials
Non-equilibrium modeling hysteresis of water freezing: Ice thawing in partially saturated porous building materials
复制标题
水冻结的非平衡模拟滞后：部分饱和多孔建筑材料中的冰融化
DOI：
10.1177/1744259119855100
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发表时间：
2019
影响因子：
2
通讯作者：
B. Schrefler
中科院分区：
文献类型：
--
作者：
D. Gawin;F. Pesavento;M. Koniorczyk;B. Schrefler
本文提出了一种新的多孔材料中湿热过程的数学模型，该材料部分饱和了液态水，暴露在低于孔隙水冰点的温度下。水-冰相变模型采用动力学方法，考虑了水的过冷度和相的热力学非平衡性，允许考虑含冰多孔材料在冻融过程中的滞后性。对两个算例进行了模型方程的求解。第一项是实验室差示扫描量热法测试，测试的水泥砂浆浸透了水，并暴露在低于冰点(−40°C)的温度下。实验结果验证了该模型的准确性和实用性。在第二个算例中，进行了网格加密试验，分析和讨论了固-液水相变模型参数对一维水冻融模型模拟结果的影响。
This article presents a novel mathematical model of hygro-thermal processes in a porous material, partially saturated with liquid water, exposed to temperatures below the freezing point of pore water. Water–ice phase transition is modeled by means of a kinetic approach considering water supercooling and thermodynamic non-equilibrium of the phases, what allows taking into account a hysteresis of ice content during freezing–thawing of moist porous materials. The model equations are solved for two numerical examples. The first one deals with laboratory differential scanning calorimetry test of a cement mortar saturated with water and exposed to temperatures below the freezing point of water (down to −40°C). The results are used for experimental validation of the proposed model, confirming its accuracy and practical usefulness. In the second example, the mesh refinement test is performed and the influence of the solid–liquid water phase change model parameters on the simulation results for a 1D model problem concerning water freezing–thawing are analyzed and discussed.