A numerical study was made on the mixed-convection in a 2D rectangular cavity using a two-dimensional unsteady laminar mathematical model for investigating the influence of the inlet flow angle and the aspect ratio.The SIMPLE(semi-implicit method for pressure-linked equations) method on a staggered grid was adopted here,and the governing differential equations were discretized by the QUICK(quadratic upwind interpolation of covective kinematics) scheme.Numerical calculations were carried out under the air su...