Superhydrophobic surfaces

as a new type of green materials

show certain application prospects in the field of anti-/de-icing. In this paper

the kinetic behaviour of impinging droplets on surfaces with different temperatures (16~-25 °C)

different inclination angles (0~60°) and different wettability (hydrophilic and superhydrophobic surfaces) is investigated through experimental comparisons

and the variations of the droplet morphology

spreading factor

spreading time and contact time are analysed. The results show that the impinging droplets exhibit different kinetic behaviours after spreading due to the different inclination angles and wettability; the maximum spreading factor and spreading time on the hydrophilic surfaces increase with the increase of inclination angle

and the variation of the spreading time on the superhydrophobic surfaces is the same as that of the hydrophilic surfaces

and the maximum spreading factor decreases with the increase of the inclination angle

especially at Ts＞-25 ℃; in comparison with the hydrophilic surfaces

the Compared with the hydrophilic surface

the impinging droplets have shorter spreading time on the superhydrophobic surface

which can reach about 10 times at Ts=-25 °C; increasing the wall inclination angle breaks the symmetric bounce of the droplets on the horizontal superhydrophobic surface

which in turn shortens the contact time of the droplets

suggesting that the increase of inclination angle can inhibit the freezing of water droplets effectively.