Influence of surface roughness on the wetting angle

A this paper the influence of surface roughness on contact angles in the system of liquid Al wetting solid surfaces of Al₂O₃ has been studied. It was observed that contact angles of liquid Al vary significantly on different rough surfaces of Al₂O₃. A model is proposed to correlate contact angles with conventional roughness measurements and wavelengths by assuming a cosine profile of rough grooves with a Gaussian distribution of amplitudes. In comparison with the experimental results, the model provides a good estimate for describing the influence of surface roughness on contact angles of liquid Al on Al₂O₃.