Modélisation du séchage des bétons

Thiéry, Mickaël; Baroghel-Bouny, Véronique; Bourneton, Nicolas; Villain, Géraldine; Stefani, C.

doi:10.1080/17747120.2007.9692945

Cited by 11 publications

(11 citation statements)

References 29 publications

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“…10 The latter effect is somewhat controversial. 43 In this regard, PNM simulations could help settle the question, at least in the case of isothermal drying. Also, the flow in adsorbed and capillary liquid films (see, e.g., Refs.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Pore network model of drying with Kelvin effect

2021

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A pore network model of isothermal drying is presented. The model takes into account the capillary effects, the transport of vapor by diffusion, including Knudsen effect, in the gas phase, and the Kelvin effect. The model is seen as a first step toward the simulation of drying in mesoscopic porous materials involving pore sizes between 4 nm and 50 nm. The major issue addressed with the present model is the computation of the menisci mean curvature radius at the boundary of each liquid cluster in conjunction with the Kelvin effect. The impact of Kelvin effect on the drying process is investigated, varying the relative humidity in the ambient air outside the medium. The simulations indicate that the Kelvin effect has a significant impact on the liquid distribution during drying. The evaporation rate is found to fluctuate due to the menisci curvature variations during drying. The simulations also highlight a noticeable non-local equilibrium effect.

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Section: Acknowledgmentsmentioning

confidence: 99%

Pore network model of drying with Kelvin effect

2021

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“…Based on the theories related to oil reservoir models [15], the relationship between the relative permeability, water pressure, gas pressure, and saturation [28,29] is derived in the following.…”

Section: Gas Flow Modelmentioning

confidence: 99%

“…By substituting Equation 18into Equations (14) and (15), the relationships between the relative permeability, water pressure, and gas pressure are derived as…”

Section: Gas Flow Modelmentioning

confidence: 99%

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Model for the Patterns of Salt-Spray-Induced Chloride Corrosion in Concretes under Coupling Action of Cyclic Loading and Salt Spray Corrosion

et al. 2019

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In this study, the patterns of chloride ion erosion of unsaturated concrete subjected to the coupling action of cyclic loading and salt spray corrosion were experimentally studied, and Fick’s Second Law was used to fit the variation patterns of chloride concentration to obtain the chloride diffusion coefficient. Accordingly, we have established a mathematical model that describes chloride transport in unsaturated concrete and accounts for the effects of gas flow, water migration, convection diffusion, and capillary action. This model is composed of three equations—the gas flow equation, the solution flow equation, and the solute convection–diffusion equation. The COMSOL numerical analysis software was subsequently used to obtain solutions for this model, based on parameters such as porosity and the chloride diffusion coefficient. Subsequently, the saturation, relative permeability, and the chloride ion concentration during the first corrosion cycle were analyzed. The numerical results were consistent with the experimental values and were therefore superior to the values obtained using Fick’s Second Law.

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“…Some researchers work on the way to simplify the model by involving only one water transfer coefficient that is a function of saturation degree [20] or the specific water content [21]. Another multiphasic approach proposed to describe the transfer of the gaseous and liquid phases [22,23], in which three constituents are distinguished: liquid water, water vapor and dry air. The moisture transfer is governed by diffusion and permeation equations.…”

Section: Introductionmentioning

confidence: 99%