Dynamics and Heat Transfer Analysis of Droplet Impact on High Temperature Spherical Surface

Leidenfrost phenomenon is a physical phenomenon caused by droplet impact on high-temperature wall surface, which is widely used in electronic engineering, mechanical engineering, power engineering, chemical engineering and other fields. However, most of the existing research focus on the Leidenfrost phenomenon on a plane, and few studies have focused on high-temperature curved surfaces, such as spheres. In order to investigate the dynamic characteristics and heat transfer characteristics of droplet impact on a high-temperature sphere, numerical simulation methods were used to study the Leidenfrost phenomenon caused by droplet impact on the hot sphere. The Leidenfrost phenomenon was analyzed from the aspects of droplet and gas film morphology, wall heat flux and pressure distribution. The interaction between droplets, gas film, and hot spherical surface was found. The article further studied the influence of factors such as droplet impact velocity, droplet size, wall temperature. The results indicate that both impact velocity and droplet size can enhance droplet spreading and heat transfer, but there are differences in the changes of the gas film between the two. An increase in impact velocity leads to accelerated exhaust and a decrease in the thickness of the central gas film. The increase in droplet size will lead to an increase in the thickness of the central gas film. The change in wall temperature has little effect on the droplet spreading situation, but an increase in the thickness of the gas film center.