Particle segregation using crystal-like structure of capsules in wall-bounded shear flow
Particle segregation using crystal-like structure of capsules in wall-bounded shear flow
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DOI：
10.1103/physrevfluids.7.063601
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发表时间：
2022-06-10
影响因子：
2.7
通讯作者：
Imai, Yohsuke
中科院分区：
文献类型：
--
作者：
Ishida, Shunichi;Matsumoto, Ryota;Imai, Yohsuke
在壁限剪切流中，可变形颗粒形成晶体状结构[Phys。莱特牧师。 120, 268102 (2018)]。为了扩展微流体装置在颗粒分选中的适用性，我们进行了晶格玻尔兹曼模拟。在这项研究中，胶囊的晶体结构可用于分离不同尺寸的胶囊。我们将小胶囊添加到大胶囊形成晶体结构的系统中，发现小胶囊的运动随着尺寸比 R-a 的变化而显着变化。当小胶囊的尺寸与大胶囊的尺寸相当时（R-a类似于1），小胶囊被困在晶体结构中。此外，它们将晶体与大胶囊组成并以扩散方式传播。然而，当R-a接近0.6或更低时，小胶囊由于低升力速度而从晶体层耗尽，并且它们以平流方式连续移动。此外，我们发现小胶囊的硬度对这种现象只有轻微的影响。结果表明，胶囊的晶体结构可用于捕获相当尺寸的胶囊或排除较小尺寸的胶囊。这项研究的结果可以作为分离和分类不同类型软颗粒的微流体应用的实践基础。
In a wall-bounded shear flow, deformable particles form a crystal-like structure [Phys. Rev. Lett. 120, 268102 (2018)]. To expand the applicability of microfluidic devices to particle sorting, we performed a lattice Boltzmann simulation. In this study, the crystal structure of capsules can be utilized to segregate capsules of different sizes. We add small capsules into a system where large capsules form a crystal structure, and find that the movement of the small capsules changes significantly with size ratio R-a. When the sizes of the small capsules were comparable to those of the large capsules (R-a similar to 1), the small capsules are trapped in the crystal structure. In addition, they composed the crystal with the large capsules and traveled in a diffusive manner. However, when R-a similar to 0.6 or lower, the small capsules were depleted from the crystal layer due to the low lift velocity, and they continuously traveled in an advective manner. Furthermore, we found that the stiffness of the small capsules had only a slight influence on this phenomenon. The results suggest that the crystal structure of capsules can be used to trap capsules of comparable sizes or to exclude capsules of smaller sizes. The findings of this study can serve as practical basis for microfluidic applications for segregating and sorting different types of soft particles.