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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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Related in: MedlinePlus

Temperature distributions after 135 days.
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC3927759&req=5

fig9: Temperature distributions after 135 days.

Mentions: Figures 6, 7, 8, and 9 show the distributions of temperature and moisture content in two dimensions of space and at times 62 days and 135 days. It can be noted, at a first time, that for the temperature case, isothermal lines are vertical in the medium and for the moisture content profiles, the lines corresponding to the equal moisture remain vertical only for low values of them. Near the cold wet side, we observe light deformations of lines having values higher than 3% of moisture content. Thus the influence of the two dimensional aspect of moisture content distributions due to the gravity effect in the wet zone is then proved.


Heat and mass transfer with condensation in capillary porous bodies.

Larbi S - ScientificWorldJournal (2014)

Temperature distributions after 135 days.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig9: Temperature distributions after 135 days.
Mentions: Figures 6, 7, 8, and 9 show the distributions of temperature and moisture content in two dimensions of space and at times 62 days and 135 days. It can be noted, at a first time, that for the temperature case, isothermal lines are vertical in the medium and for the moisture content profiles, the lines corresponding to the equal moisture remain vertical only for low values of them. Near the cold wet side, we observe light deformations of lines having values higher than 3% of moisture content. Thus the influence of the two dimensional aspect of moisture content distributions due to the gravity effect in the wet zone is then proved.

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