EXPERIMENTAL INVESTIGATION OF CUBE CAVITY SYNTHETIC JET PERFORMANCE ON HEAT SINKS

This study investigates the effects of zero net mass flux synthetic jets on maintaining a constant surface temperature during the cooling of finned and flat heat sinks. Uniquely, it compares the cooling efficiency of these two types of heat sinks under the actuation of multiple loudspeakers, aiming to enhance thermal management and prevent overheating and premature failure in electronic components. An experimental setup was built using plexiglass material and loudspeakers to design a special cube cavity that can produce synthetic jets. Heat sinks were heated using a silicon heater attached to a power source. Experiments were conducted on heated flat and finned surfaces using electromagnetic synthetic jets with various frequency values. The effects of the number of orifices, the height-to-diameter ratio (<i>h/d</i>), and the number of loudspeakers on shaping synthetic jets were further examined. Applying a frequency of 200 Hz to the heated finned surface resulted in a decrease in surface temperature by approximately 57.1% with one loudspeaker and by 47.1% with five loudspeakers. The effects of the amplifier on the experimental setup were investigated in the research. Moreover, at 200 Hz, the surface temperature decreased by around 44.5% with an amplifier and by 2.5% without it. Additionally, the importance of the amplitude produced by the signal generator was examined, and a slight decrease in the heat transfer rate was observed. The results suggest that synthetic jets can be effectively applied to enhance cooling in CPU heat sinks, potentially extending device lifespan and preventing overheating.