气流剪切作用下附着液滴的运动特性研究

The motion and deformation of droplets are the most common phenomena in industrial production and daily life. The motion characteristics of sessile droplets on solid surface under shear airflow are investigated in this paper through experiments. The effects of droplet volume and airflow velocity on droplet movement and deformation are mainly explored, and the relationship between droplet deformation and droplet volume, airflow velocity is obtained. The results show that the airflow velocity corresponding to the moment when the droplet starts to move decreases with the increase of droplet volume. As the airflow velocity and droplet volume increase, the droplet slides on the solid surface. There are 4 typical patterns such as ① spreading, ② spreading and separating sub-droplets, ③ spreading into a rivulet and separating sub-droplets, and ④ sliding and breaking up to form sub-droplets and separating sub-droplets. When the airflow velocity is small, the maximum spreading factor and the maximum height factor of the droplet are less influenced by droplet volume. When the airflow velocity is larger, the maximum spreading factor of the droplet decreases with the increase of the droplet volume, and the maximum height factor increases with the increase of droplet volume. When the maximum height factor exceeds 2, the droplets break up to form sub-droplets driven by shear airflow.