Effective cooling of a flat plate surface using synthetic jet actuator

In this stady, the effect of a synthetic jet on the heat transfer of flow over a flat plate is investigated experimentally and numerically. The exprimental study is consist of a heater made of copper plate having constant heat flux located in he wind tunnel, and including a synthetic jet actuator injected into the stream by the entrance of plate. In the investigations, the Reynolds number in the main stream, the frequency and amplitude in the actuator are changed while the geometry and Prandtl number remain constant for all cases, and the effect of these parameters on heat transfer is analyzed. The experiments aare carried out at six different frequencies and four different amplitudes. The problem is also investigated numerically by using the Fluent Commercial code. In order to explain the heat transfer mechanism, instantaneous velocity and temperature profiles are obtained. The numerical results revael that there is a disruptive effect on the hydrodynamic boundary layer of synthetic jet actuator, which improves the heat transfer. The obtained results are given as dimensionless parameters. It is observed that, the cycle-averaged Nusselt number increases whit both Womersley number (w0) and dimensionless amplitıde (a0). The numerical results are compared whit experiments for different jet parameters, and good agreement between experimental and numerical results is obtained.