Experimental study on the motion of droplets excited by Lamb waves on an inclined non-piezoelectric substrate

Abstract

The motion of water droplets induced by Lamb waves on an inclined glass substrate, which is excited by a single phase transducer (SPT), has been investigated in this study. There are three main factors that affect the motion, namely, input power, droplet volume, and plate inclination angle. When the droplet volume and plate inclination angle are fixed, the velocities of the two (advancing and receding) edges of the droplet are found to be strongly related to the input power. Moreover, under a certain input power and a certain droplet volume, the larger the angle, the higher the velocities of the advancing and receding edges of the droplet. However, the droplet velocity is not proportional to the droplet volume under a certain input power and a certain angle. In addition, two-dimensional time-dependent incompressible Navier–Stokes equations of the droplet on the inclined glass slope are investigated.