Lattice Boltzmann simulation of capillary interactions among colloidal particles
Lattice Boltzmann simulation of capillary interactions among colloidal particles
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DOI：
10.1016/j.camwa.2007.08.027
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发表时间：
2008-04
期刊：
影响因子：
--
通讯作者：
J. Onishi;A. Kawasaki;Yu Chen;H. Ohashi
中科院分区：
文献类型：
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作者：
J. Onishi;A. Kawasaki;Yu Chen;H. Ohashi
我们提出了一个用于动态模拟附着在流体界面上的胶体颗粒的数值模型。本文提出了一种新的耦合方法，将胶体颗粒的牛顿动力学和流体相的格子Boltzmann方法结合起来，以考虑颗粒表面的润湿性。利用这一特性，除了静电和流体动力学相互作用之外，还可以模拟胶体颗粒的毛细管相互作用。为了验证所提出的模型，我们进行数值模拟的稳定流周围的正方形阵列的圆柱体，在静止的溶剂中的移动粒子的瞬态动力学，以及附着到多组分流体界面的胶体粒子的接触角。此外，我们应用当前的模型来模拟两个胶体颗粒在流体界面处的毛细相互作用。相关的物理参数对颗粒的动力学，特别是润湿性和重力的影响，进行了研究。
We present a numerical model for dynamic simulation of colloidal particles attached to a fluid interface. A new coupling method is proposed for combining Newtonian dynamics for colloidal particles and the lattice Boltzmann method for fluid phases so as to account for the wetting properties of particle surfaces. With this feature, capillary interaction of colloidal particles, in addition to electrostatic and hydrodynamic interactions, can be simulated. For the validation of the proposed model, we perform numerical simulations of the steady flow around a square array of cylinders, the transient dynamics of a moving particle in the quiescent solvent, as well as the contact angle of a colloidal particle attached to the multi-component fluid interface. Further, we apply the current model to simulate capillary interactions between two colloidal particles at a fluid interface. Effects of the relevant physical parameters on the dynamics of the particles, in particular, wettability and gravity, are investigated.