通过流体薄膜的软胶囊之间的毛细管相互作用
Capillary interactions between soft capsules protruding through thin fluid films
摘要：
当悬浮液干燥时，悬浮流体蒸发，留下由悬浮颗粒组成的干膜。在干燥的最后阶段，衬底上的流体膜的高度下降到低于颗粒尺寸，引起局部界面变形，导致颗粒之间的强毛细管相互作用。虽然刚性颗粒之间的毛细相互作用已经得到了很好的研究，但关于软颗粒的行为以及它们在薄膜干燥的最后阶段的柔软性的作用，还有很多东西有待理解。在这里，我们使用我们最近推出的数值方法，耦合使用晶格玻尔兹曼方法描述的流体的有限元描述的可变形物体的悬浮软颗粒的膜的干燥过程进行调查。我们测得的弹性变形和横向毛细作用力，这与以前的理论和实验工作的刚性颗粒的情况下，显示的变形变小，随着颗粒的柔软度增加，导致较弱的横向相互作用力。在大的粒子间距离，力接近刚性粒子。最后，我们调查的时间依赖性的颗粒簇的形成在后期阶段的薄膜干燥。
英文摘要：
When a suspension dries, the suspending fluid evaporates, leaving behind a dry film composed of the suspended particles. During the final stages of drying, the height of the fluid film on the substrate drops below the particle size, inducing local interface deformations that lead to strong capillary interactions among the particles. Although capillary interactions between rigid particles are well studied, much is still to be understood about the behaviour of soft particles and the role of their softness during the final stages of film drying. Here, we use our recently-introduced numerical method that couples a fluid described using the lattice Boltzmann approach to a finite element description of deformable objects to investigate the drying process of a film with suspended soft particles. Our measured menisci deformations and lateral capillary forces, which agree well with previous theoretical and experimental works in case of rigid particles, show the deformations become smaller with increasing particles softness, resulting in weaker lateral interaction forces. At large interparticle distances, the force approaches that of rigid particles. Finally, we investigate the time dependent formation of particle clusters at the late stages of the film drying.
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