Analysis of depinning behavior of drop on chemically heterogeneous surface

作者：Bing He, Chunyan Qin, Sihao Zhou, Binghai Wen · 发表于：Physical Review Fluids · 年份：2020 · DOI：10.1103/physrevfluids.5.114003 · 被引用次数：18 · 研究领域：Surface Modification and Superhydrophobicity、Fluid Dynamics and Heat Transfer、Nanomaterials and Printing Technologies

Three types of depinning behaviors of a drop on a heterogeneous surface are numerically investigated. Depinning is found to occur due to two processes: slow- and fast-moving. A dynamic equilibrium results from competition between gravity and the capillary force in the whole drop. At the microscopic scale, based on measurement of the real-time contact angle, the local force balance in the contact line region is maintained by the unbalanced Young's force and the substrate resistance in the slow-moving stage, while the unbalanced Young's force provides the driving force for contact line motion in the fast-moving stage.