论文标题
晶格玻尔兹曼（Boltzmann）的干颗粒悬浮液模拟
Lattice Boltzmann simulations of drying suspensions of soft particles
论文作者
论文摘要
在胶体悬浮液的干燥过程中颗粒的排序对于确定所得膜的特性至关重要。例如，微观不均匀性会导致形成裂纹和缺陷，从而大大恶化膜的质量。这种类型的问题是固有的多尺度，在这里我们使用我们最近开发的方法在数值上进行研究，以模拟多组分流体中的软聚合物胶囊。我们专注于颗粒柔软度对干燥阶段膜微结构的影响，以及它与缺陷的形成方式。我们通过测量Voronoi熵和各向同性顺序参数来量化颗粒的顺序。令人惊讶的是，当颗粒的柔软度增加时，两种可观察到的表现都表现出非单调的行为。我们进一步研究了在蒸发阶段的粒子相互作用与微观结构变化之间的相关性。我们观察到，刚性颗粒会形成链状结构，当颗粒柔软度增加时，它们往往会散布成小簇。
The ordering of particles in the drying process of a colloidal suspension is crucial in determining the properties of the resulting film. For example, microscopic inhomogeneities can lead to the formation of cracks and defects that can deteriorate the quality of the film considerably. This type of problem is inherently multiscale and here we study it numerically, using our recently developed method for the simulation of soft polymeric capsules in multicomponent fluids. We focus on the effect of the particle softness on the film microstructure during the drying phase and how it relates to the formation of defects. We quantify the order of the particles by measuring both the Voronoi entropy and the isotropic order parameter. Surprisingly, both observables exhibit a non-monotonic behaviour when the softness of the particles is increased. We further investigate the correlation between the interparticle interaction and the change in the microstructure during the evaporation phase. We observe that the rigid particles form chain-like structures that tend to scatter into small clusters when the particle softness is increased.
