Topology optimization of electrode patterns for electroosmotic micromixer
Topology optimization of electrode patterns for electroosmotic micromixer
复制标题
电渗微混合器电极图案的拓扑优化
DOI：
10.1016/j.ijheatmasstransfer.2018.06.065
复制
发表时间：
2018-11-01
影响因子：
5.2
通讯作者：
Korvink, Jan G.
中科院分区：
文献类型：
--
作者：
Deng, Yongbo;Zhou, Teng;Korvink, Jan G.
在微通道等有限的微流体空间中，电渗是一种方便的库仑力机制，用于电驱动流体中存在的带电粒子和离子，并通过拖曳力泵送电解液本身。电极对的形状和位置（其感应电荷与流体接触）决定了电场，从而决定了由此产生的流体动力学速度分布。在本文中，我们讨论了此类驱动机制中电极对模式的逆向设计。我们的方法是使用拓扑优化来逆向确定电极对的模式。优化过程需要对所需流体行为进行数学描述，然后驱动电极对的模式以实现目标性能。我们演示了该过程的行为，该过程将纳维-斯托克斯方程与电荷传输耦合起来，以实现层流微流的高效电渗微混合器。我们表明，该过程允许在选定参数变化的影响下研究此类微流，从而探索实现最佳设备性能的设计空间。这种开发的方法在表面结构的拓扑优化上是新颖的，以控制体积性能及其在其他体积域的低维表面上的实现，其中材料插值在狄利克雷和纽曼类型的边界条件之间实现。 (C) 2018 Elsevier Ltd. 保留所有权利。
In confined microfluidic spaces such as microchannels, electroosmosis is a convenient Coulomb-force mechanism used to electrically actuate charged particles and ions presented in the fluid and pump the electrolytic fluid itself through drag forces. The shape and position of electrode pairs, whose induced charges are in contact with the fluid, determine the electric field and hence the resulting fluid-dynamic velocity distribution. In this paper, we address the inverse design of the electrode-pair patterns in such actuation mechanisms. Our approach is to use topology optimization to inversely determine the patterns of an electrode pair. The optimization procedure requires a mathematical description of the desired fluid behaviour, and then drives the patterns of the electrode pairs to achieve the goal performance. We demonstrate the behaviour of the procedure, which couples the Navier-Stokes equations with charge transportation, to implement an efficient electroosmotic micromixer for laminar microflow. We show that the procedure allows to investigate such microflows under the influence of selected parameter variations, thereby exploring the design space towards optimal device performance. This developed method is novel on the topology optimization of a surface structure to control bulk performance and its implementation over a lower-dimensional surface of an otherwise volumetric domain, where the material interpolation is implemented between Dirichlet and Newmann types of boundary conditions. (C) 2018 Elsevier Ltd. All rights reserved.