A novel spray cooling device based on a dual synthetic jet actuator integrated with a piezoelectric atomizer

To solve the heat dissipation problem of electronic equipment, a novel spray cooling device based on a dual synthetic jet actuator integrated with a piezoelectric atomizer (DSJAPA) is proposed and designed. The flow field, spray characteristics and cooling performance of DSJAPA are investigated experimentally. The experimental results show that the spray angle increases with the increase of driving voltage, and it can achieve the maximum of 74 degrees. Under a certain driving voltage, there exists an optimum driving frequency making the spray angle reach to the maximum. The spray flow field is investigated by droplet image velocimetry (PIV) system. The results show that the spray droplet velocity can be accelerated to about 22.5 m/s by the high-speed ejection of the jet. With the increase of dual synthetic jet velocity, the dense spray with low velocity changes into the dilute spray with high velocity. A dual synthetic jet actuator can improve the cooling capability of spray, reduce the temperature non-uniformity of surface (from 32 degrees C in spray cooling to 18 degrees C in DSJAPA cooling) and enlarges the direct impingement range (from (-30 mm, 25 mm) in spray cooling to (-60 mm, 57 mm) in DSJAPA cooling).