Directional motion of vibrated sessile drops : a quantitative study

摘要: The directional motion of sessile drops can be induced by slanted mechanical vibrations the substrate. As previously evidenced \cite{Brunet07,Brunet09,Noblin09}, induce drop deformations which combine axisymmetric and antisymmetric modes. In this paper, we establish quantitative trends from experiments conducted within a large range parameters, namely amplitude $A$ frequency $f$ forcing, liquid viscosity $\eta$ angle between substrate forcing axis $\alpha$. These are carried out on weak-pinning substrates. For most parameters sets, averaged velocity $ grows linearly with $A$. We extract mobility, defined as $s=\frac{\Delta }{\Delta A}$. It is found that $s$ show sharp maximal value close to resonance first mode $f_p$. tends almost independent below 50 cSt, while decreases significantly for higher $\eta$. Also, it peculiar sets particularly far enough $f_p$, moves in reverse direction. Finally, draw relationship values dynamical contact angles at both sides over one period oscillation.