Shape Optimization of Electromagnetic Driven Oscillator for Improving Heat Dissipation of Heatsink in Electronic Devices

Heatsink is a heat dissipation system which widely used in the present electronic devices. As the integration of electronic equipment increases, traditional axial fans are adopted in the heat dissipation for heatsink in electronic devices due to its size limitations may no longer ensure that its can work normally and efficiently. The electromagnetic driven oscillator (EDO) is mainly composed of a pair of oscillating sheets and an electromagnetic driving device. As an innovative way of heat dissipation, it has been gradually attracting attention in recent years. The work principle is that the electromagnetic force makes the oscillating fans vibrate and gives rise to surrounding airflow achieving the purpose of cooling. In this paper, the effect of the electromagnetic driven oscillator on heat dissipation is studied. And, there are two different fan sheets: the straight boundary fin (SBF) and the jagged top boundary fin (JTBF). The numerical simulation and experiment were combined to study the heat transfer and flow characteristics of the heatsink with EDO. The results indicate that the electromagnetic driven oscillator (EDO) can effectively decrease the temperature on the heatsink, and the airflow generated by the vibration of the oscillator can take away the heat; the heat dissipation effect of the jagged top boundary fan (JTBF) is better than the straight boundary fan (SBF). For the jagged top boundary fan (JTBF), the area of the high temperature of the heatsink is significantly smaller and 1.4K lower than the temperature of the straight boundary fan (SBF).