Electrical driven rolling behavior of water droplet on a super hydrophobic surface

The paper aims at studying the electrical driven rolling behavior of water droplet on a super-hydrophobic surface under electrical field. Firstly, Parallel plate electrodes and super-hydrophobic surface (contact angle > 150°) are adopted. Experiments are conducted to investigate deformation and rolling behavior of water droplet on super-hydrophobic surface when A.C voltage is applied. Secondly, Electrical field distribution of water droplet on super-hydrophobic surface is simulated with Finite Element Method (FEM). Electrostatic stress that drives water droplet to roll is calculated by combing electrical field distribution results with Maxwell stress tensor. Simulation and calculation results indicated electrostatic force had a tendency to drive water droplet to roll.