论文标题
通过旅行超声波推进子弹和杯形纳米和微粒
Propulsion of bullet- and cup-shaped nano- and microparticles by traveling ultrasound waves
论文作者
论文摘要
近年来，通过平面旅行超声波通过平面行进超声波推进胶体颗粒引起了人们的关注。经常研究的颗粒类型是子弹形和杯形纳米和微粒。基于大量流体模拟，本文研究了子弹形颗粒的推进如何取决于其长度和直径，其中包括杯形颗粒作为对应于最小粒子长度的限制案例。讨论了由颗粒产生的流场的结构，并表明颗粒的推进强度随长度和直径而增加。在变化直径时，我们也观察到推进的符号变化。这项工作补充了以前仅针对特定纵横比解决此类颗粒的实验研究，并且提供了对颗粒的推进如何取决于其维度的理解，这将有助于选择最适合未来实验研究的粒子形状。
The propulsion of colloidal particles via planar traveling ultrasound waves has attracted increasing attention in recent years. A frequently studied type of particles is bullet-shaped and cup-shaped nano- and microparticles. Based on acoustofluidic simulations, this article investigates how the propulsion of bullet-shaped particles depends on their length and diameter, where cup-shaped particles are included as limiting cases corresponding to the smallest particle length. The structure of the flow field generated by the particles is discussed and it is shown that the particles' propulsion strength increases with their length and diameter. When varying the diameter, we observed also a sign change of the propulsion. This work complements previous experimental studies that have addressed such particles only for particular aspect ratios, and the provided understanding of how the propulsion of the particles depends on their dimensions will prospectively be helpful for the choice of particle shapes that are most suitable for future experimental studies.
