Abstract
Water droplet on wedge-shaped pattern surface with hydrophilic and hydrophobic regions can spread spontaneously in a specific direction. In this study, we investigated the mechanism of the surface tension-driven spontaneous drop spreading behaviors by the lattice Boltzmann modeling and experimental validation. Based on the Shan-Chen (SC) type multicomponent multiphase model with an algorithm for relatively accurate contact angle measuring, we simulated four cases with various vertex angles (ψ = 15°, 20°, 28°, 35°) of wedge-shaped pattern. After then, such surfaces were fabricated and corresponding experiments were conducted. The time dependence of the droplet move distance was characterized in both the simulations and experiments with average deviation within 6.11%. Related force contour and vector analyses were presented to discuss the driving mechanism. This study is expected to shed light on the physical exploration and provide insightful hints to better tune and control the directional spreading of the surface tension-driven droplet.
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