Submerged liquid jet array impingement cooling with high gravity effects

Submerged liquid jet array impingement has been considered as one of the most effective cooling technologies. By combining the impingement and forced convection effects, it provides high heat transfer coefficients and compact cooling designs. The present studies are to extend the liquid jet array impingement for the thermal management of airborne electronic devices, which are subjected to conditions with high gravities. The high gravity studies were conducted on an Submerged liquid jet array cooling system, which had a nozzle plate with 14×21 circular nozzles arranged in a uniform square pattern with a jet-to-jet distance of 7.0 mm. The diameter of the nozzles was 0.3 mm and the jet-to-target spacing was 3.0 mm. The high gravity test results showed that an heat transfer coefficient of about 7000 W/(m².K) could be achieved at a flow rate of 4.5 L/min for a heated plate up 12g in all directions. The computational fluid dynamics (CFD) numerical simulations of the jet array impingement were conducted. The heat transfer coefficient results agree well with the experimental data and some information of the temperature and velocity fields was obtained.