Numerical Simulation of Digital Microfluidics Based on Electrodynamic Model
Because of its simple structure, low consumption of energy but strong driving forces, Electrowetting on Dielectric (EWOD) is used most frequently in digital microfluidics for manipulation and control of droplets. However, the internal mechanism of EWOD has not yet been come to an agreement. Aiming at the doubt and divarication about EWOD in digital microfluidics, in this paper, the internal mechanism of EWOD was explained through numerical simulation based on Electrodynamic model. First, the mathematical expression of electrodynamic actuation force acting on the surface of droplet was deduced, and then the boundary conditions for the governing equation of droplet were confirmed. Before studying the mechanism of EWOD through numerical simulation, the influence of mesh grids division on simulation results was analyzed and the feasibility of the above-mentioned simulation model was verified by comparing numerical simulation results with theoretical ratiocination. Last but not least, we compared the Electrodynamic actuation force acting on the surface of droplet among three different kinds of digital microfluidics’ structure, which have the same three-phase contact line but different area of contact domain. Analytical results showed that electrodynamic actuation force generated solely by accumulation of induced charges in contact domain was more than three times as much as that generated merely by accumulation of induced charges at three-phase contact line. Induced charges accumulated on both three-phase contact line and contact area of droplet were dedicated to EWOD, but contact area played a major role in the change of contact angle of droplet.
Chen Liguo Ling Mingxiang Liu Deli Sun Lilin
Robotics and Microsystems Center, Soochow university, Suzhou, China State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin, China
国际会议
长春
英文
1-5
2011-08-29（万方平台首次上网日期，不代表论文的发表时间）