Dynamic behavior of a single water droplet with 2.8 mm in diameter impacting on cold surface was visually observed by high speed camera

the evolutional characteristics of water droplet impacting on cold superhydrophobic and bare aluminum surfaces were comparatively studied. Besides

the effect of initial impacting velocity and cold surface temperatures on the dynamic behavior of water droplet on cold surface were analyzed. The experimental result showed that compared with the instantly freezing of water droplet impacting on cold bare aluminum surface

the water droplet impacting on cold superhydrophobic surface (-25—-5℃) can not freeze along with spreading

retraction

rebound and smash behaviors. The higher the impacting velocity is

the bigger the spreading factor is and the more easily the water droplet freezes on cold bare aluminum surface. Moreover

rebounding behavior can be found when droplet impacts on the superhydrophobic surface with a low speed (We≤76) and velocity has no effect on the maximum spreading time. Also

obvious droplet fingers will appear and can be fragmented into many satellite droplets as droplet impacts on cold superhydrophobic surface with a high speed (We≥115). In addition

cold surface temperature has obvious effect on rebounding height but has little effect on the spreading factor and spreading time. The results indicate that the superhydrophobic surface can prevent the water droplet effectively from freezing instantly as the droplet impacts on cold surface.