In the present study, a three-dimensional numerical investigation of cooling a hot flat plate using a cross flow of air as a main cooling stream while using a portion of the flow to introduce a jet from an annular nozzle normal to a flat plate and the crossflow. A numerical model was generated, and experiments were performed using the finite element method with SST k - ω turbulence model. The Reynolds number of the jet (Rej) varied from 2500 to 10000, different jet to plate spacings (Z/D = 0.5, 1, 2, 4, and 6) were tested, and the blockage ratio (BR) varied from 0 to 0.6 where 0 refers to the conventional round jet. Results show that the best average Nusselt number can be achieved at Rej=10000, Z/D=0.5, and BR=0.6. The heat transfer enhancement was calculated using the annular jet and compared to the case without jet. The average Nusselt number with the annular jet was found to be 3.9 times the case without jet. Results also show that there is an enhancement of the Nusselt number for the case of an annular jet when compared to the case of a round jet.