复杂流动中各向异性颗粒的聚焦效应
Anisotropic Particles Focusing Effect in Complex Flows
摘要：
有限尺寸效应可以导致中性浮力颗粒表现出与示踪颗粒不同的动力学特性，并且可以改变它们在流体流动中的传输特性。在这里，我们调查的颗粒的形状对他们的分散在二维复杂的流动的效果。结合数值模拟与实验室实验，我们表明，各向同性和各向异性形状的颗粒表现出不同的拉格朗日相干结构，在给定的流场内的不同的分散现象。棒状粒子的实验表明，在涡核附近的聚焦效应。我们提出了一个简单的模型，描述了在二维流中的中性浮力椭球粒子的动态，并表明，粒子的纵横比和方向相关的力可以产生聚集现象的漩涡。
英文摘要：
Finite size effects can lead neutrally buoyant particles to exhibit different dynamics than tracer particles, and can alter their transport properties in fluid flows. Here we investigate the effect of the particle's shape on their dispersion in 2-dimensional complex flows. Combining numerical simulations with laboratory experiments, we show that particles with isotropic and anisotropic shapes exhibit different Lagrangian coherent structures, resulting in distinct dispersion phenomena within a given flow field. Experiments with rod shaped particles show a focusing effect in the vicinity of vortex cores. We present a simple model that describes the dynamics of neutrally buoyant ellipsoidal particles in two-dimensional flow and show that particle aspect ratio and orientation dependent forces can generate clustering phenomena in vortices.
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