Droplet bouncing on moving superhydrophobic groove surfaces

This study examined the bounce behavior of droplets impacting a moving superhydrophobic groove surface (SGS) and focused on the effect of the normal and tangential Weber numbers (Wen and Wes, respectively). The experimental results indicate that the rebound behavior of the droplets varied greatly with the substrate velocity at the same Wen. Furthermore, with an increase in the superhydrophobic substrate velocity, the maximum spreading diameter increased, whereas the dimensionless contact time first increased, then decreased, and finally stabilized. Additionally, scaling laws for predicting the maximum spreading diameter and velocity recovery coefficients were proposed and verified using our experimental data.