(180l) Investigation of Lateral Drop Motion By Centrifugal Adhesion Balance (CAB)

Akash K. Jena¹, Sirui Tang¹, Semih Gulec¹, Sakshi Yadav¹, Rafael Tadmor^1,2

1. Dan F. Smith Department of Chemical Engineering, Lamar University, Beaumont TX 77710
2. Department of Mechanical Engineering, Ben Gurion University, Beer Sheva, Israel

Drop sliding motion is invariably affected by many factors which include topography, ambient conditions, and the substances or chemicals used. With increasing force in the lateral direction that is exerted on the drop, there is an observable trend by which to correlate drop motion and these factors. The point at which the drop has slid is detailed as the onset of motion in the plot, including the fast motion period that entails the drop sliding off the surface. Also, throughout the sliding period, another value correlation is determined known as the interfacial modulus, G_s, which is associated with the resistance of the outermost layer of the solid substrate to the liquid. Hence, determining these values, we conducted experiments with increasing centrifugal force (force in lateral direction) to determine trends in position, contact angles, and G_s. Also, a correlation between lateral force extremities and normal force conditions was observed which also helped us expand the characteristic of the interfacial modulus value. All these parameters, such as G_s, onset of motion, contact angles were compared with different substrates, conditions, and chemicals used.