Liquid film evaporation inside an inclined channel: Effect of the presence of a porous layer

In this paper, we numerically investigate the improvement of the heat and mass transfer during the evaporation of a liquid film by introducing a liquid saturated porous layer inside an inclined channel. To achieve this, we solved the non linear partial differential equations that describe the physic...

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Bibliographic Details
Published in:International journal of thermal sciences 2016-11, Vol.109, p.136-147
Main Authors: Terzi, A., Foudhil, W., Harmand, S., Jabrallah, S. Ben
Format: Article
Language:English
Subjects:
Engineering Sciences
Evaporation
Heat and mass transfer
Liquid film
Mechanics
Porous layer
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Summary:In this paper, we numerically investigate the improvement of the heat and mass transfer during the evaporation of a liquid film by introducing a liquid saturated porous layer inside an inclined channel. To achieve this, we solved the non linear partial differential equations that describe the physical system using the finite volume method in both phases (liquid saturated porous layer and gas). Compared to the liquid case, the use of the porous layer promotes the heat and mass transfer. This improvement is greater when we increase the air inlet velocity and we decrease the porosity and the thickness of the porous medium. We also propose correlations that allows us to relate the Nusselt and Sherwood numbers to the Reynolds and Biot numbers. •Numerical study on the evaporation of a liquid film inside an inclined channel.•We evaluate the effect of introducing a liquid saturated porous layer.•The evaporation is more enhanced in the presence of the porous layer.•The use of the porous medium is more efficient for high Reynolds number for the gas phase and low porosity.
ISSN:1290-0729
1778-4166
DOI:10.1016/j.ijthermalsci.2016.05.018