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Particle trapping in merging flow junctions by fluid-solute-colloid boundary interactions
Physical Review Fluids ( IF 2.7 ) Pub Date : 
Sangwoo Shin, Jesse T. Ault, Kazumi Toda-Peters, and Amy Q. Shen

Merging of different streams in channel junctions represents a common mixing process that occurs in systems ranging from soda fountains and bathtub faucets to chemical plants and microfluidic devices. Here, we report a spontaneous trapping of colloidal particles in a merging flow junction when the merging streams have a salinity contrast. We show that the particle trapping is a consequence of non-equilibrium interactions between the particles, solutes, channel, and the freestream flow. A delicate balance of transport processes results in a stable near-wall vortex that traps the particles. We use 3-D particle visualization and numerical simulations to provide a rigorous understanding of the observed phenomenon. Such trapping mechanism is unique from the well-known inertial trapping enabled by vortex breakdown [Proc. Natl. Acad. Sci. U.S.A. 111, 4770 (2014)], or the solute-mediated trapping enabled by diffusiophoresis [Phys. Rev. X 7, 041038 (2017)], as the current trapping is facilitated by both the solute and the inertial effects, suggesting a new mechanism for particle trapping in flow networks.

中文翻译:

流体-溶质-胶体边界相互作用在融合流路中的颗粒捕集

通道连接处不同流的合并代表了常见的混合过程,该过程发生在从苏打水和浴缸龙头到化工厂和微流控设备的系统中。在这里,我们报告当合并的流具有盐度对比时,在合并的流结中自发地捕获胶体颗粒。我们表明,颗粒捕集是颗粒,溶质,通道和自由流之间非平衡相互作用的结果。传输过程之间的微妙平衡会导致捕获颗粒的近壁涡旋稳定。我们使用3-D粒子可视化和数值模拟来提供对观察到的现象的严格理解。这种诱捕机制与已知的由涡旋破坏引起的惯性诱捕是独特的。Natl。学院 科学 美国111,4770(2014)],或通过扩散电泳实现溶质介导的捕获[Phys。Rev. X 7,041038(2017)],因为溶质和惯性效应都促进了电流俘获,这提出了一种在流动网络中进行粒子俘获的新机制。
更新日期:2020-01-24
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