Characteristics in a Liquid-Cooled Microchannel with a Pair of Adjacent Micro-Synthetic Jets: Influence of Reynolds Number and Stroke

Liquid cooling of microelectronics is highly effective for the thermal management of electronic devices. Its application in high-flux scenarios is challenging due to limited cooling capacity and substantial pump volume. Particularly in compact electronic systems and lab-on-a-chip applications. This paper investigates heat and mass transfer in a microchannel using vectoring phenomena in a pair of adjacent synthetic jets. The integration of a pair of adjacent micro-synthetic jets into the microchannel enables control over the flow direction and eliminates external pumping requirements, reducing system complexity and power consumption to generate a cross-flow. This is accomplished by applying optimal operating conditions within a simple geometric configuration. Moreover, complex fluid dynamics created by impinging micro synthetic jets in a microchannel enhance cooling capacity, resulting in 70 % increase in the average Nusselt number (N u) compared to when the jets are off. The performance of the liquid-cooled system is evaluated for a water-based nanofluid containing A I2 O3 at a 5 % volume fraction. The study examines the impact of the jet Reynolds number (Re ej) and the dimensionless stroke length (Lj) on system performance. Results show increasing the R ej enhances heat transfer by producing a stronger jet. N u increases about 46 % for the case with R ej=122 in comparison to when R ej=54. The correlation obtained between N u and R ej suggests a power-law relationship between these two parameters. R ej has minimal impact on the overall jet behavior, whereas variations in stroke length at a constant R ej=73 significantly alter jet behavior and fluid flow characteristics within the microchannel, resulting in changes in the local Nusselt number. In addition, the degree of heat transfer (DCE) equal to 1. 8 5 at the optimum stroke length is achieved.