Publication de 6 numéros par an
ISSN Imprimer: 1940-2503
ISSN En ligne: 1940-2554
Indexed in
EFFECT OF A PERIODIC HEATING TEMPERATURE ON DOUBLE-DIFFUSIVE CONVECTION IN A POROUS SQUARE ENCLOSURE SUBMITTED TO CROSS GRADIENTS OF TEMPERATURE AND CONCENTRATION
RÉSUMÉ
Numerical results of 2D double-diffusive natural convection in a square porous cavity submitted to cross gradients of temperature and concentration are presented in this study. The temperature of the lower horizontal surface (hot temperature) is varied sinusoidally with time, while that of the opposite surface (cold temperature) is maintained constant. The vertical walls are maintained at uniform but different concentrations. The parameters governing the problem are the amplitude of the variable temperature (0 ≤ a ≤ 1), its period (0.01 ≤ τ ≤ 1), the Lewis number (0.1 ≤ Le ≤ 10), and the thermal Rayleigh number (50 ≤ Ra ≤ 250). The ratio of the buoyancy forces was maintained at a constant value equal to 0.1 (case of dominating thermal buoyancy forces). The effects of these parameters on the flow intensity and heat and mass transfers are studied. The results obtained show that the heat transfer, the mass transfer, and the flow intensity could be significantly enhanced, with respect to the case of a constant heating temperature, by a proper choice of the parameters related to the periodic heating.
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Nield Donald A., Bejan Adrian, Double-Diffusive Convection, in Convection in Porous Media, 2017. Crossref