Effect of electrode geometry on droplet velocity in open EWOD based device for digital microfluidics applications

Electro wetting-on-dielectric (EWOD) is an emerging method for handling droplet motion by applying an electric field to an array of electrodes. The dependence of droplet velocities on different electrode configuration in open EWOD system has been investigated in this work. In this paper, open configured EWOD devices with different geometries of electrodes, polydimethylsiloxane (PDMS) as a base layer are designed and fabricated. The electrowetting force is computed by analytical methods as well as by numerical methods and its effect on droplet velocity is studied in detail. The velocity of the droplet is measured by using open image processing tool.