Modeling the deformation and breakup of a surfactant-coated droplet on a roughness solid surface in shear flow

A surfactant-coated droplet attached to a rough wall subjected shear flow is investigated using coupled lattice Boltzmann with the finite difference method, where contact angle hysteresis model introduced into method characterize surface roughness. The first verified by equilibrium of semi-circular setting on bottom plane. It then adopted explore surfactant role motion and deformation two representative windows. For window (0°, 180°), i.e., line remains pinned, addition surfactants promotes hinders increasing effective capillary number. However, for (70°, 110°), always deformation. Finally, breakup presented. breakup.