Characteristic of heat transfer using synthetic jet cooling in a closed loop system

The size and complexity of modern electronic devices have made it increasingly challenging to address heat dissipation problems. Existing temperature management methods are not effective in dealing with the overheating issues of small electronic components and compact high-power devices. Previous research has overlooked the relationship between vortex formation and heat transfer coefficient (HTC) values. Therefore, this study investigates the use of synthetic jets, which involve a periodically moving diaphragm and cavity with a nozzle, to address this issue. The expelled air from the nozzle generates a vortex that progresses through different phases. Fluid characteristics are simulated using ANSYS FLUENT software, and the simulation data is validated through temperature measurement experiments. After optimizing the parameters using the Taguchi method, a temperature response prediction equation is derived. The diameter of the nozzle has the most significant impact on the maximal response, followed by the depth of the cavity and the distance between the nozzle and the heated surface. Smaller volumes and cavities are preferred because they enhance convection between the forced air and the heated surface. A distance of 30 mm is found to be sufficient for maintaining the intensity and coherence of the vortex formation. The radius of the vortex formation has no significant role when there is a considerable distance between the formation and the heated plate. In conclusion, to maximize heat transmission, the vortex formation should be as close to the heater surface as possible, and the developed equation can predict the temperature response within the parameter range studied.