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MASS AND HEAT TRANSFERS BY FORCED CONVECTION DURING LIQUID FILM EVAPORATION IN A CHANNEL WITH A BUILT-IN POROUS SQUARE CYLINDER

Volume 22, Edição 4, 2019, pp. 395-409
DOI: 10.1615/JPorMedia.2019028660
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RESUMO

The aim of this numerical work is to study the improvement of the heat and mass transfers during the evaporation of a liquid film with neglected thickness in a heated channel with a built-in porous square cylinder. The cylinder has a constant porosity and permeability. The calculations have been completed for a Reynolds number ranging from 20 to 100, Darcy number Da ≤ 10-6, and a blockage ration of H/h = 1/4. To achieve this, we solved the classic equation of forced convection and the Darcy-Brinkman-Forchheimer model. Results are presented to show the influence of the porous cylinder on the mass transfer. There is an improvement in the mass transfer with the presence of the porous cylinder. This improvement is greater with an increase in air inlet velocity and heat flux density. It is also greater with a decrease in temperature and relative humidity of the air at the inlet. At Da = 10-6, the flow does not penetrate through the porous cylinder; the flow pattern is similar to that of a solid square cylinder.With an increase of the Darcy number, the flow starts to pass through and around the cylinder. Finally, a correlation has been proposed for the Sherwood number as a function of the Reynolds and Biot numbers.

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