Texas Tech University , Edward E. Whitacre Jr. College of Engineering, Department of Mechanical Engineering, P.O. Box 41021, Lubbock, Texas 79409, United States.
Texas Tech University , Edward E. Whitacre Jr. College of Engineering, Department of Chemical Engineering, Sixth Street and Canton Avenue, Lubbock, Texas 79409, United States.
Langmuir. 2018 Jan 23;34(3):904-916. doi: 10.1021/acs.langmuir.7b02448. Epub 2017 Sep 26.
A Stokesian dynamics simulation of the effect of surface Couette flow on the microstructure of particles irreversibly adsorbed to an interface is presented. Rather than modeling both bulk phases, the interface, and particles in a full 3D simulation, known interfacial interactions between adsorbed particles are used to create a 2D model from a top down perspective. This novel methodology is easy to implement and computationally inexpensive, which makes it favorable to simulate behavior of particles under applied flow at fluid-fluid interfaces. The methodology is used to examine microstructure deformation of monodisperse, rigid spherical colloids with repulsive interactions when a surface Couette flow is imposed. Simulation results compare favorably to experimental results taken from literature, showing that interparticle forces must be 1 order of magnitude greater than viscous drag for microstructure to transition from aligned particle strings to rotation of local hexagonal domains. Additionally, it is demonstrated that hydrodynamic interactions between particles play a significant role in the magnitude of these microstructure deformations.
本文提出了一种斯托克斯动力学模拟，研究了表面库埃特流对不可逆吸附到界面上的颗粒微观结构的影响。该模拟不是在全 3D 模拟中同时建模整个相、界面和颗粒，而是从自上而下的角度利用已知的吸附颗粒之间的界面相互作用创建 2D 模型。这种新颖的方法易于实现且计算成本低，非常适合模拟流固界面下颗粒在施加流场中的行为。该方法用于研究在施加表面库埃特流时具有排斥相互作用的单分散刚性球形胶体的微观结构变形。模拟结果与文献中的实验结果非常吻合，表明颗粒间的相互作用力必须比粘性阻力大 1 个数量级，微观结构才能从对齐的颗粒链转变为局部六边形区域的旋转。此外，还表明颗粒间的流体动力学相互作用对这些微观结构变形的幅度有重要影响。
