Effect of cavity design of synthetic jet actuator to the heat transfer characteristic of an impinging flow configuration

A Synthetic jet works based on a vibrating membrane inside a cavity and nozzle for the air outlet. The synthetic jet cavity interior has an important role to generate the air at sufficient conditions to do the cooling process. This research investigated the flow and convective heat transfer characteristics on four impinging synthetic jet prototype with different excitation modes of a sinusoidal waveform forcing. The main purpose of this synthetic jet was to create vortices pair to come out from nozzle which will accelerate the heat transfer process occurring at the impinged wall. This heat transfer enhancement principles became the basis to simulate an alternative cooling system to substitute the conventional fan cooling in electronic devices due to its advantage for having a small form factor and low noise. The investigation combined computational and experimental works. In the experiment sinusoidal waveform was used to oscillate the membrane and the wave frequency used were 80 Hz, 120 Hz, 160 Hz and the velocity amplitude was 1 m/s. Some results indicated significant influence of the cavity design, frequency excitation, and waveform to the rate of heat transfer obtained.