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Titre: | Analytical and numerical study of the evaporation on mixed convection in a Vertical rectangular cavity |
Auteur(s): | Ihdene, M. Ben Malek, T. Aberkane, Sofiane Mouderes, M. Spiterri, P. Ghezal, A. |
Mots-clés: | Heat and mass transfer Mixed convection Numerical and analytical study Channel flow |
Date de publication: | 2017 |
Collection/Numéro: | Fluid Dynamics and Materials Processing/ Vol.13, N°2 (2017);pp. 85-105 |
Résumé: | We consider an ascending laminar air flow in a vertical channel formed by
two parallel flat plates wetted by a thin water film and under different temperature and
concentration conditions. The study includes a numerical finite volume method for the
treatment of the double diffusion problem, where the analytical solution is given to the
thermal diffusion. The analytical study showed that the reversed flow is observed only
under some wall temperature conditions and also for certain values of Re/Gr. The
reversed flow is also strongly dependent on the aspect ratio A, which is based on the
cross section of the channel.
Indeed, the results show than this dependence is very strong for values less than a certain
critical one equal to 2.22. In the absence of the mass transfer the results showed that the
evaporation rate remains null along the channel, decreases when the mass gradient is
favorable and it finally vanishes at x=15. However, the evaporation rate increases in the
case of an unfavorable mass gradient, to cancel at position x=20, then merges with the
curve representing the forced convection. In the absence of heat transfer the evaporation
rate is less important and amounts to fifty percent of the double diffusion. The results
obtained by the analytical and numerical methods are compared each other and with
those of a similar works and a good agreement was found |
URI/URL: | http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/4394 |
Collection(s) : | Publications Internationales
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