A new method was proposed to estimate the rolling angle of a droplet on a superhydrophobic surface. Based on the relationship between the adhesion work and the force moment of the spherical droplet, a rolling angle model was established. For smooth surfaces, the equation we obtained is sin α ≥, and for rough surfaces, the equation is sin α ≥. The relationship between the rolling angle, the contact angle, and the surface structure was investigated. The equations we obtained revealed the factors that have important influences on the rolling angle, including the surface roughness, the trapped air, the mass of droplet, and the chemical composition of the surface. The simulation results showed that the rolling angle decreases with the increases of the contact angle, the surface roughness, the proportion of trapped air, the weight of the droplet, and the hydrophobicity of the surface material. These results agreed well with the most widely used explanation of other researchers.
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