Impingement Cooling Performance Analysis and Improvement of Synthetic Jets for Electronic Devices

Abstract

With the development of miniaturization, high power density, and a high degree of integration of electronic devices, heat dissipation has become a major factor constraining its development. As an active flow control technology, synthetic jets can significantly enhance heat transfer and cooling ability. In this paper, an unsteady numerical model of heat transfer is established to explore the impingement cooling performance of synthetic jets. The effect of nozzle-to-surface distance on the cooling performance is analyzed. The results show that the cooling ability of synthetic jets first increases and then decreases with an increasing nozzle-to-surface distance. At small nozzle-to-surface distances, there is a significant recirculation phenomenon of hot air, leading to a notable deterioration of heat transfer and cooling performance. To solve this issue at small nozzle-to-surface distances, a hybrid synthetic jet based on a fluid diode is designed. The further simulation results show that the proposed hybrid synthetic jet can effectively avoid recirculation of hot air and significantly improve the impingement cooling ability at small nozzle-to-surface distances. The temperature of the target surface under the action of the proposed hybrid synthetic jet is decreased by about 10°C in comparison with the conventional synthetic jet without fluid diodes.