Experimental study on flow and heat transfer characteristics of liquid cooling device based on multi-orifice dual synthetic jets

To address the heat dissipation challenge in aerospace and electronics, this paper undertakes liquid cooling experiments utilizing a novel multi-orifice dual synthetic jets actuator (MODSJA). The performance of the DSJ-based liquid cooling device and the associated flow fields are thoroughly analyzed, considering the effects of various parameters, including heat flux, channel inlet flow rate, and driving frequency. Results indicate that the wall temperature of the device increases with increasing heat flux. When DSJ is on, the wall temperature decreases; otherwise, the wall temperature reduction can also be achieved by increasing the inlet flow rate, which substantially increases the pressure drops. This is because higher flow rate allows the fluid to carry away faster heat more quickly, resulting in a temperature drop. When the actuator is activated at a flow rate of 0.16×10^–3 m³/min, the wall temperature is reduced by 3.07 ℃, which is comparable to that achieved with an inlet flow rate of 0.4×10^–3 m³/min when the actuator is off. This indicates that the pump power requirement can be reduced at least 583.08% without causing additional pressurerop. Within the frequency range under investigation, the DSJ liquid cooling device achieves an optimal performance at 20 Hz, yielding a wall temperature decrease of 3.80 ℃ and a marginal increase of 0.03 kPa in the pressure drop. Moreover, a higher driving voltage results in a more pronounced wall temperature drop, achieving a maximum reduction of 4.16 ℃ at 240 V. In summary, the experimental results clearly show that DSJ can achieve significant heat dissipation with a negligible increase in pressure drop, thus making it a promising solution for heat management in aerospace and electronic applications.