Non-equilibrium modeling hysteresis of water freezing: Ice thawing in partially saturated porous building materials
| Autor: | Dariusz Gawin, Marcin Koniorczyk, Francesco Pesavento, Bernhard A. Schrefler |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
water supercooling
Materials science Liquid water 0211 other engineering and technologies numerical model of coupled heat and mass transport Equilibrium modeling non-equilibrium model of phase change Porous materials water freezing–ice thawing hysteresis Partially saturated 02 engineering and technology Building and Construction Freezing point Hysteresis 021105 building & construction General Materials Science Composite material Porous medium Porosity Physics::Atmospheric and Oceanic Physics 021101 geological & geomatics engineering |
| Zdroj: | Journal of Building Physics. 43:61-98 |
| ISSN: | 1744-2583 1744-2591 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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