受限式阵列射流冲击传热的试验和数值研究

Array jet impingement is an effective method to enhance heat transfer performance in microchannels or confined spaces. The effects of dimensionless parameters of jet height/jet distance (Z/L = 0.60 ~ 1.67) on the heat transfer of multi-jet impinging flow were investigated from the perspectives of the target surface temperature distribution, the flow field information and the global Nusselt number by experiment and numerical simulation. The results show that, the interaction force between the fluids becomes more balanced with an odd number of jet holes. At a constant total flow rate, fewer jet holes lead to better cooling performance. The jet has obvious deviation with relatively smaller jet spacings. The symmetry of the flow structure will gradually recover with the increase of the jet spacing, the interaction between jets will weaken, and the temperature distribution on the heating surface and the fluid velocity distribution will become more uniform. The flow and heat transfer performances of multiple jets are jointly affected by Z and dj, and Z/dj has little difference in Nusselt number distributions for 2 and 3 jet holes, where the Nusselt number reaches its peak for Z/dj = 1.67 and 1.25, respectively. The findings contribute to optimizing multiple jets ’ configurations and further enhancing their heat transfer performances.