This paper examines the mixed convection in a square cavity filled with different nanofluids. The
lower side is stationary and was equally divided into a pair of heat source–sink; the left and right
vertical sides are be insulated and have opposed velocity whilst the upper side is stationary and
insulated. Steady state laminar regime is considered, the transport equations for continuity,
momentum, energy are solved. The numerical results are reported for the effect of Richardson
number, and solid volume fraction on average Nusselt for various parametric conditions. This
study was done for 0.01 ≤ Ri ≤ 100, and 0 ≤ λ ≤ 0.06 while the Prandtl number represent water is
kept constant at 6.2 and Grashof number at 104. A comparison is made with the previous
published results. The comparison shows good agreements with previous published results.