The high heat flux from electronic devices such as projectors, LEDs, or high power chips requires effective cooling methods at heat dissipation in a limited space. In the present study, the heat and fluid flow characteristics of isothermally heated objects located in a duct were numerically analyzed in order to investigate cooling of electronic devices. The channel had three objects attached to its bottom wall. The numerical computations were performed by solving two-dimensional steady laminar governing equations using the Fluent 17.0 program. Air moving with uniform velocity was taken as the cooling working fluid in the duct. A triangular arc shaped cross-section part was used as a control element. The top and bottom walls of the duct and the part were adiabatic. The part was located at three different points in the y-direction, and these parameters were tested at three different Reynolds numbers (150 <= Re <= 600). The results were also compared with a non-triangular arc shaped case. The results show that insertion of a triangular arc shaped cross-section part increased the heat transfer for all the Reynolds numbers and the best heat transfer was observed for the part position with y = 1.75H.