基于多级设计概念的肋化内冷通道流动换热特性

Using the numerical simulation, the fluid flow and heat transfer characteristics of a ribbed channel considering four rib configurations (transverse ribs, inclined ribs, V-shaped ribs, and inverse V-shaped ribs) and two designs (uniform design and hierarchical design) were studied for verifying the effectiveness of the hierarchical design concept. The results demonstrated that using the hierarchical design, the heat transfer performances of four kinds of ribs slightly decreased, the transverse rib had a minimum reduction below than 3.00%, while the inclined rib presented a maximum reduction up to 12.76%; the flow resistance was significantly reduced, the transverse rib had a minimum reduction with the decreased friction factor by 36.15%—37.67%, the inverse V-shaped rib had a maximum reduction with the decreased friction factor by 46.98%—50.32%; as a result, the hierarchical design effectively improved the overall cooling performance of the ribbed channel with a reduction of 81.29% for the inverse V-shaped rib at Reynolds number of 100 000. The slight reduction of the heat transfer performance and the marked resistance reduction came from the combination of the constrained secondary flows and the lowering effect of the mainstream.