自由液体射流冲击高速旋转圆盘的耦合换热

To study the conjugate heat transfer characteristics of a free liquid jet impinging on a uniformly heated high-speed rotating disk, the effects of solid and fluid material parameters on the flow and heat transfer were analyzed by numerical simulation. The results showed that the local Nusselt number distribution corresponding to different solid material parameters was similar, and the maximum relative deviation of the Nusselt number at the same radius position was not more than 10%. Compared with the radial temperature distribution, the axial temperature difference was more affected by the change in the thermal conductivity of the solid material. The maximum radial temperature difference between copper and foam brick was only 3 times, while the difference between the maximum axial temperature difference approximately inverse to the thermal conductivity was 3 471 times. The average radial velocity and heat transfer performance of liquid film on the disk surface decreased with the increase of fluid viscosity. The secondary peak heat transfer intensity corresponding to ammonia and water with less viscosity increased by more than 15% compared with the primary peak, and the secondary peak heat transfer intensity of lubricant oil with higher viscosity was only 50% —60% of the primary peak. When water and ammonia were used as the jet medium, the surface temperature of the disk remained almost constant, and the maximum temperature difference ratio was less than 7.86×10^-4. When the lubricant oil was used as the jet medium, the temperature near the stagnation point changed drastically. In the region with R/d exceeding 2.5, the temperature distribution only fluctuated slightly.