Numerical simulation of high-speed micro-droplet impingement on thin liquid film covering a heated solid surface has been carried out. Effect of droplet Weber number and liquid film thickness on the characteristics of flow and heat transfer has been investigated using the coupled level set and volume of fluid method. The code is validated against both the experimental and numerical results from the literature. Results show that the crown dynamics is mostly affected by variations in the initial film thickness but is weakly influenced by changes in the Weber number. The liquid within the film can be categorized as three regions based on the heat transfer distribution: the static film region, the transition region, and the impact region. The transient local wall temperature shows three stages: first stage when the temperature decreases rapidly, followed by a second stage in which the temperature starts to rise and then becomes almost constant in the third stage. After drop impact, the local Nusselt number continuously increases until reaching a maximum value, and then decreases approaching the initial impact stage. Our analysis of the change in Weber number shows that larger Weber number contributes to intense temperature variation at the crater core relative to other radial locations. Lastly, the results reveal that the thinner liquid film leads to lower wall temperature and hence, higher average Nusselt number.

进行了高速微滴撞击覆盖加热的固体表面的液体薄膜的数值模拟。使用耦合液位集和流体体积法研究了液滴韦伯数和液膜厚度对流动和传热特性的影响。该代码已针对文献中的实验结果和数值结果进行了验证。结果表明，胎冠动力学主要受初始膜厚度变化的影响，但受韦伯数变化的影响较小。薄膜内的液体可根据传热分布分为三个区域：静态薄膜区域，过渡区域和冲击区域。瞬时局部壁温显示三个阶段：第一阶段，温度迅速下降；接下来是第二阶段，在第二阶段中温度开始升高，然后在第三阶段中变得几乎恒定。跌落撞击后，局部Nusselt数不断增加，直到达到最大值，然后在接近初始撞击阶段减小。我们对韦伯数变化的分析表明，相对于其他径向位置，较大的韦伯数会导致陨石坑核心的剧烈温度变化。最后，结果表明，液膜越薄，壁温越低，平均努塞尔数越高。我们对韦伯数变化的分析表明，相对于其他径向位置，较大的韦伯数会导致陨石坑核心的剧烈温度变化。最后，结果表明，液膜越薄，壁温越低，平均努塞尔数越高。我们对韦伯数变化的分析表明，相对于其他径向位置，较大的韦伯数会导致陨石坑核心的剧烈温度变化。最后，结果表明，液膜越薄，壁温越低，平均努塞尔数越高。