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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

Distribution of heat flow due to conduction (in W/m2) for t = 135 days.
© Copyright Policy - open-access
Related In: Results  -  Collection


getmorefigures.php?uid=PMC3927759&req=5

fig19: Distribution of heat flow due to conduction (in W/m2) for t = 135 days.

Mentions: Figures 16, 17, 18, and 19 give the distributions of heat flow. It will be noted that the quantitative comparison between the heat flow due to the phase change and the heat flux due to conduction heat transfer shows a prevalence of the last one compared to that due to phase change. The mathematical model used can then be simplified, where the term corresponding to heat transfer due to phase change can be neglected in comparison with conductive heat transfer term.


Heat and mass transfer with condensation in capillary porous bodies.

Larbi S - ScientificWorldJournal (2014)

Distribution of heat flow due to conduction (in W/m2) for t = 135 days.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig19: Distribution of heat flow due to conduction (in W/m2) for t = 135 days.
Mentions: Figures 16, 17, 18, and 19 give the distributions of heat flow. It will be noted that the quantitative comparison between the heat flow due to the phase change and the heat flux due to conduction heat transfer shows a prevalence of the last one compared to that due to phase change. The mathematical model used can then be simplified, where the term corresponding to heat transfer due to phase change can be neglected in comparison with conductive heat transfer term.

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