Thermal, flow and acoustic characteristics of the heat sink integrated inside the synthetic jet actuator cavity

The proper thermal management is crucial in most modern electronic devices in order to assure their reliable and efficient operation. The paper presents a cooling device which consists of a loudspeaker-driven synthetic jet actuator with integrated radial heat sink. A total of eleven different geometric configurations with various numbers of orifices and orifice diameters were investigated. For all studied geometries the resonance frequency was experimentally determined. The most of the cooling device characteristics were measured at the loudspeaker resonance frequency. The radial heat sink with heat transfer area of 0.1 m(2) was used. The thermal resistance of the heat sink without the synthetic jet actuator was equal to 1.4 K/W, while the same heat sink cooled with the synthetic jet was found to have a thermal resistance of 0.19 K/W. The cooling device is able to dissipate up to 282 W of thermal power consuming merely 7 W to drive the synthetic jet actuator. The sound pressure level generated by the device was measured and correlated with momentum velocity, furthermore the method for noise reduction was proposed.