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Heat and mass transfer with condensation in capillary porous bodies.

Larbi S - ScientificWorldJournal (2014)

Bottom Line: Special emphasis is given to the study of the mechanism involved and the evaluation of classical theoretical models used as a predictive tool.Beyond the complexity of the interaction effects between vaporisation-condensation processes on the gas-liquid interfaces, the comparison between experimental and numerical simulations permits to identify the specific contribution and the relative part of mass and energy transport parameters.This analysis allows us to understand the contribution of each part of the mathematical model used and to simplify the study.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Mechanical Engineering and Development, Department of Mechanical Engineering, Polytechnic National School of Algiers, 10, Avenue Hassen Badi, B.P. 182, El-Harrach, 16200 Algiers, Algeria.

ABSTRACT
The purpose of this present work is related to wetting process analysis caused by condensation phenomena in capillary porous material by using a numerical simulation. Special emphasis is given to the study of the mechanism involved and the evaluation of classical theoretical models used as a predictive tool. A further discussion will be given for the distribution of the liquid phase for both its pendular and its funicular state and its consequence on diffusion coefficients of the mathematical model used. Beyond the complexity of the interaction effects between vaporisation-condensation processes on the gas-liquid interfaces, the comparison between experimental and numerical simulations permits to identify the specific contribution and the relative part of mass and energy transport parameters. This analysis allows us to understand the contribution of each part of the mathematical model used and to simplify the study.

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Distributions of moisture content. Numerical simulation results.
© Copyright Policy - open-access
Related In: Results  -  Collection


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fig2: Distributions of moisture content. Numerical simulation results.

Mentions: Figure 2 shows the distribution of moisture content obtained by numerical simulation at different times. It will be noted that the dry zone of the porous medium is in hygroscopic equilibrium with its environment and no point of condensation is observed in this zone although the dew point is located in it. At the first time of this study we have expected that the condensation phenomena can be located at a section corresponding to the dew point in the medium; the experimental results confirm the opposite. This result can be explained by evaporation-condensation process taking place simultaneously in this section. The wet zone appears on the cold side of the medium (x = 20 cm) and the front of condensation extends from this position towards (x = 12 cm).


Heat and mass transfer with condensation in capillary porous bodies.

Larbi S - ScientificWorldJournal (2014)

Distributions of moisture content. Numerical simulation results.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3927759&req=5

fig2: Distributions of moisture content. Numerical simulation results.
Mentions: Figure 2 shows the distribution of moisture content obtained by numerical simulation at different times. It will be noted that the dry zone of the porous medium is in hygroscopic equilibrium with its environment and no point of condensation is observed in this zone although the dew point is located in it. At the first time of this study we have expected that the condensation phenomena can be located at a section corresponding to the dew point in the medium; the experimental results confirm the opposite. This result can be explained by evaporation-condensation process taking place simultaneously in this section. The wet zone appears on the cold side of the medium (x = 20 cm) and the front of condensation extends from this position towards (x = 12 cm).

Bottom Line: Special emphasis is given to the study of the mechanism involved and the evaluation of classical theoretical models used as a predictive tool.Beyond the complexity of the interaction effects between vaporisation-condensation processes on the gas-liquid interfaces, the comparison between experimental and numerical simulations permits to identify the specific contribution and the relative part of mass and energy transport parameters.This analysis allows us to understand the contribution of each part of the mathematical model used and to simplify the study.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Mechanical Engineering and Development, Department of Mechanical Engineering, Polytechnic National School of Algiers, 10, Avenue Hassen Badi, B.P. 182, El-Harrach, 16200 Algiers, Algeria.

ABSTRACT
The purpose of this present work is related to wetting process analysis caused by condensation phenomena in capillary porous material by using a numerical simulation. Special emphasis is given to the study of the mechanism involved and the evaluation of classical theoretical models used as a predictive tool. A further discussion will be given for the distribution of the liquid phase for both its pendular and its funicular state and its consequence on diffusion coefficients of the mathematical model used. Beyond the complexity of the interaction effects between vaporisation-condensation processes on the gas-liquid interfaces, the comparison between experimental and numerical simulations permits to identify the specific contribution and the relative part of mass and energy transport parameters. This analysis allows us to understand the contribution of each part of the mathematical model used and to simplify the study.

Show MeSH
Related in: MedlinePlus