Abstract: The present work consists to investigate numerically the mixed convection heat transfer in a multiple vented enclosure, confining alumina-water nanofluid, with inlet and outlet ports due to the suction of leaving flow. The bottom wall is subjected to a linearly varying decreasing heat, whereas the other boundaries are assumed to be thermally insulated. The consequence of varying the Reynolds number, 200 ≤ Re ≤ 5000, and nanoparticles concentration, 0 ≤ Φ ≤ 0.07, on the dynamical and thermal characteristics of the flow and heat transfer performances are investigated and discussed. The obtained results show that the presence of nanoparticles enhances the heat transfer across the cavity and promotes the reheating of this latter. Morever, a comparative study shows that the decreasing temperature profile has the same thermal performance as that of a uniform temperature profile.

Key words: Mixed convection, nanofluid, decreasing heating, multiple vented cavity, suction.