The theory of heat and moisture transfer in porous media revisited

Vries, D. A. de

doi:10.1016/0017-9310(87)90166-9

Cited by 182 publications

(73 citation statements)

References 13 publications

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“…(b) Considering the existence of evaporation-condensation phenomena due to the structural changes of the material, the Philip and De Vries' analysis [12][13][14] has been carried out and has made it possible to achieve a better agreement with the experimental results. However, a limited time lag between modelled and experimental results is observed.…”

Section: Resultsmentioning

confidence: 99%

“…Its consideration for the calculation of the 'apparent' thermal conductivity of wet porous materials can take different forms. De Vries 14 advises the use of (º diff þ º a ) for the effective thermal conductivity of the air component, where º a is the normal thermal conductivity of air whereas Bouguerra 27 and Laurent et al 28 use the relationship presented in equation (15) and obtain the following expression for º Ã…”

Section: Philip and De Vries' Analysis (Pdva)mentioning

confidence: 99%

“…7). The classical Philip and De Vries' analysis (PDVA) [12][13][14] allows for the consideration of the evaporation-condensation mechanism, which occurs within non-saturated porous media submitted to relatively high temperatures. This analysis has been already applied successfully on hardened civil engineering materials (wood concrete, 27 autoclaved aerated concrete, 28 for example).…”

Section: Philip and De Vries' Analysis (Pdva)mentioning

confidence: 99%

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Experimental study and modelling approaches for the thermal conductivity evolution of hydrating cement paste

Mounanga

Khelidj

Bastian

2004

Advances in Cement Research

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Thermal stresses due to hydration heat release within concrete structures can lead to early age cracking particularly in cases of massive structures. In order to prevent, minimise and avoid this, a good knowledge of the evolution of cement-based material heat transfer properties at early stages of hydration is essential. In order to address the problem of the evolution of the thermal conductivity of fresh cement paste, two models developed by the authors are discussed: first, the 'apparent' thermal conductivity is calculated, assuming the fresh cement paste to be a multiphase material, which makes it possible to consider the material chemical evolution. The second modelling approach is based on the theory of heat and mass transfer within non-saturated porous media. The second modelling results appear to fit the experimental results better. Notation

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Section: Resultsmentioning

confidence: 99%

Section: Philip and De Vries' Analysis (Pdva)mentioning

confidence: 99%

Section: Philip and De Vries' Analysis (Pdva)mentioning

confidence: 99%

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Experimental study and modelling approaches for the thermal conductivity evolution of hydrating cement paste

Mounanga

Khelidj

Bastian

2004

Advances in Cement Research

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“…3,4 Many researchers consider soil being directly impregnated from the heat radiating from a single source. 5 Buried transmission cables, for example, are covered with backfill.…”

Section: General General General General Generalmentioning

confidence: 99%

Untitled

Neaupane¹,

Sugimoto²

2003

ScienceAsia

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It is necessary to estimate thermal boundary condition in a number of scientific and engineering applications. The research in this paper uses extended Kalman filter coupled with the finite element method to formulate an inverse problem and estimate the thermal boundary known as heat transfer coefficient (HTC). A simple non-linear formulation based on steady-state heat conduction has been incorporated in the Kalman filter loop. From the laboratory experiment, steady state temperatures were measured at predefined locations. The heat transfer coefficient (HTC) was estimated inversely from these measurements.

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“…This software, developed at the Fraunhofer Institute for Building Physics (Germany), permits an assessment of changes in the moisture content and temperature inside structures depending on interior and exterior climatic conditions [32][33][34]. The use of the software for the numerical simulation requires knowledge of boundary conditions and thermal and moisture-related properties of the materials used [35,36].…”

Section: Simulation Program Used and Validationmentioning

confidence: 99%

Underground Air Duct to Control Rising Moisture in Historic Buildings: Improved Design and Its Drying Efficiency

2017

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Abstract. The underground air ducts along peripheral walls of a building are a remediation method, which principle is to enable an air flow along the moist building structure's surface to allow a sufficient evaporation of moisture from the structure. This measure reduces the water transport (rising moisture) into the higher parts of the wall where the high water content in masonry is undesirable. Presently, underground air ducts are designed as masonry structures, which durability in contact with ground moisture is limited. The article describes a new design of an underground air duct, which is based on specially shaped concrete blocks (without wet processes, because the blocks are completely precast). The air duct from concrete blocks is situated completely below the ground surface (exterior) or below the floor (interior). Thanks to this, the system is invisible and does not disturb the authentic look of rehabilitated historic buildings. The efficiency of the air duct technical solution was verified by the results of tests (based on the measured moisture values) conducted on a laboratory model. The experimental study showed that the moisture in the masonry equipped with the presented underground air duct had decreased considerably compared to the reference sample, namely by 43 % on average. The experimental study was numerically validated through numerical simulations performed with the program WUFI 2D.

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The theory of heat and moisture transfer in porous media revisited

Cited by 182 publications

References 13 publications

Experimental study and modelling approaches for the thermal conductivity evolution of hydrating cement paste

Experimental study and modelling approaches for the thermal conductivity evolution of hydrating cement paste

Untitled

Underground Air Duct to Control Rising Moisture in Historic Buildings: Improved Design and Its Drying Efficiency

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