Numerical Study of the Evaporation Effects on the Microdroplet Dynamics in Digital Microfluidic Biochips  

作　　者：Ali Ahmadi Matt Dale Buat Mina Hoorfar 

机构地区：[1]School of Engineering, University of British Columbia, Kelowna V1V1V7, Canada

出　　处：《Journal of Mechanics Engineering and Automation》2011年第5期401-406,共6页机械工程与自动化（英文版）

摘　　要：In this paper, an electrohydrodynamic approach is used to model and study dynamics of evaporating microdroplets in digital microfluidic systems. A numerical eleetrohydrodynamic approach is used to calculate the driving force and shear force （due to the walls）. Effects of contact line pinning is considered by adding a three-phase contact line force, and also considering dynamic contact angle which modifies the mierodroplet boundary conditions. Since air is used as the filler fluid, the drag force is neglected. Although energy equation is not solved （constant temperature assumption）, effects of the evaporation is considered from two aspects： It is shown that an additional force is needed to balance the dynamic equation of the mierodroplet motion. Also, at each time step the microdroplet interface has to be deformed due to the change in the microdroplet radius. Important findings of the proposed model includes the transient velocity and displacement of the microdroplet as well as the driving and opposing forces acting on the microdroplet as functions of time. It is shown that mass loss due to evaporation tends to accelerate the droplet; whereas the competitive effect of the reduced driving force decelerates the droplet at the end of motion. The modeling results indicate that evaporation plays a crucial role in microdroplet motion by changing the force balance and the microdroplet boundary condition.

关 键 词：Digital microfluidic MICRODROPLET EVAPORATION electrohydrodynamic. 

分 类 号：P435[天文地球—大气科学及气象学] TQ114.26[化学工程—无机化工]