A New Approach for Modeling of the Surfactant Effect on a Sessile Oil Drop Motion

In this paper, we study the surfactant effect on the motion of an immersed sessile drop. We propose a new approach for the contact-line dynamic, involving forces acting on the drop motion such as the friction force from the wall and the mechanical force balance from the three-phase contact line. The drop shape formula is determined by the principle of minimization surface energy, subjected to mass conservation. Our numerical simulations show that the proposed model is in agreement with the experimental results which performs that surfactant alters the wettability of a surface to become more water-wet.