A numerical technique to simulate display pixels based on electrowetting
A numerical technique to simulate display pixels based on electrowetting
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DOI：
10.1007/s10404-015-1581-5
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发表时间：
2015-08-01
影响因子：
2.8
通讯作者：
Mugele, Frieder
中科院分区：
文献类型：
--
作者：
Roghair, Ivo;Musterd, Michiel;Mugele, Frieder
本文提出了一种数值模拟技术来计算导电和非导电流体在外加电场作用下的界面变形以及液-液-固三相接触线的运动。该技术基于OpenFOAM框架中实现的流体体积法，使用相分数参数来跟踪不同的相。我们通过将电效应方程——高斯定律和电荷输运方程——与流体流动的Navier-Stokes方程耦合来解决复合电流体动力学问题。具体来说，我们使用多域方法来求解系统的固体和液体介电部分的电场。引入Cox-Voinov边界条件来描述运动接触线的动态接触角。我们用解析解提出了几个基准问题来验证仿真模型。随后，将该模型用于研究基于电润湿的显示像素的动力学。我们证明了打开和关闭像素的模拟结果与相同参考几何形状的实验测试之间具有良好的定性一致性。
We present a numerical simulation technique to calculate the deformation of interfaces between a conductive and non-conductive fluid as well as the motion of liquid-liquid-solid three-phase contact lines under the influence of externally applied electric fields in electrowetting configuration. The technique is based on the volume of fluid method as implemented in the OpenFOAM framework, using a phase fraction parameter to track the different phases. We solve the combined electrohydrodynamic problem by coupling the equations for electric effects-Gauss's law and a charge transport equation-to the Navier-Stokes equations of fluid flow. Specifically, we use a multi-domain approach to solving for the electric field in the solid and liquid dielectric parts of the system. A Cox-Voinov boundary condition is introduced to describe the dynamic contact angle of moving contact lines. We present several benchmark problems with analytical solutions to validate the simulation model. Subsequently, the model is used to study the dynamics of an electrowetting-based display pixel. We demonstrate good qualitative agreement between simulation results of the opening and closing of a pixel with experimental tests of the identical reference geometry.