Lattice Boltzmann Simulations of Multiphase Dielectric Fluids.
Lattice Boltzmann Simulations of Multiphase Dielectric Fluids.
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DOI：
10.1021/acs.langmuir.1c00606
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发表时间：
2021-06
期刊：
影响因子：
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通讯作者：
É. Ruiz-Gutiérrez;A. Edwards;G. McHale;M. Newton;G. Wells;C. Brown;R. Ledesma‐Aguilar
中科院分区：
文献类型：
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作者：
É. Ruiz-Gutiérrez;A. Edwards;G. McHale;M. Newton;G. Wells;C. Brown;R. Ledesma‐Aguilar
电场对介电液体的动态效应称为液体介电泳。它被广泛用于多种工业和科学应用，包括喷墨打印，微加工和光学设备。液体介电电泳的数值模拟对于理解该现象的基本物理学是必要的，但也可以探索可能难以或昂贵的实验实现的情况。然而，这种建模是具有挑战性的，因为需要同时求解静电和流体动力学方程。在这里，我们制定了一个新的格子玻尔兹曼方法能够在一个单一的框架内与电场耦合的不混溶的介电流体的动力学建模，从而消除了使用单独的算法来解决静电和流体动力学方程的需要。我们通过与解析解和先前报道的实验结果进行比较来验证数值方法。除了基准的方法，我们研究了液滴的扩散使用介电润湿设置和量化的机制驱动液滴的表观接触角的变化与施加的电压。我们的方法提供了一个有用的工具来研究液体介电电泳，并可以用来模拟一般的介电流体，如液-液和液-气系统。
The dynamic effect of an electric field on dielectric liquids is called liquid dielectrophoresis. It is widely used in several industrial and scientific applications, including inkjet printing, microfabrication, and optical devices. Numerical simulations of liquid-dielectrophoresis are necessary to understand the fundamental physics of the phenomenon, but also to explore situations that might be difficult or expensive to implement experimentally. However, such modeling is challenging, as one needs to solve the electrostatic and fluid dynamics equations simultaneously. Here, we formulate a new lattice-Boltzmann method capable of modeling the dynamics of immiscible dielectric fluids coupled with electric fields within a single framework, thus eliminating the need of using separate algorithms to solve the electrostatic and fluid dynamics equations. We validate the numerical method by comparing it with analytical solutions and previously reported experimental results. Beyond the benchmarking of the method, we study the spreading of a droplet using a dielectrowetting setup and quantify the mechanism driving the variation of the apparent contact angle of the droplet with the applied voltage. Our method provides a useful tool to study liquid-dielectrophoresis and can be used to model dielectric fluids in general, such as liquid-liquid and liquid-gas systems.