Investigation of particle dispersion and deposition in a channel with elliptic obstructions using lattice Boltzmann method

2012 7th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) Pub Date : 2012-03-05 DOI:10.1109/NEMS.2012.6196830

A. Tehrani, A. Moosavi

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引用次数: 1

Abstract

Particle transport and deposition in a channel flow with elliptic obstruction is studied. Numerical simulation of fluid flow is performed using two-dimensional lattice Boltzmann method, while one-way coupling Lagrangian method for particle tracking is used. Standard particles are injected in the inlet of the channel. Gravity, Drag force, Brownian forces, and the Saffman lift are considered in equation of particle motion. The influence of geometrical parameter, ellipse aspect ratio, is studied on dispersion and deposition of particles as well as the flow parameters, such as Reynolds number. In addition, the effect of particles size -particles of 0.01-10μm in diameter- on dispersion and deposition patterns is studied. Results reveal more inertial and gravitational trapping on obstacle surface for particles of larger diameter and obstacles of higher aspect ratio. In addition, the Brownian diffusion and the vortexes formed behind the obstacle, which occurs in high Reynolds numbers, dominantly affect finer particles trajectories.

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用晶格玻尔兹曼方法研究粒子在椭圆形障碍物沟道中的弥散和沉积

研究了具有椭圆形障碍物的通道流中粒子的输运和沉积。采用二维晶格玻尔兹曼方法对流体流动进行数值模拟，采用单向耦合拉格朗日方法对粒子进行跟踪。在通道入口注入标准颗粒。在粒子运动方程中考虑了重力、阻力、布朗力和萨弗曼升力。研究了椭圆长径比等几何参数和雷诺数等流动参数对颗粒弥散和沉积的影响。此外，还研究了0.01 ~ 10μm粒径对分散和沉积模式的影响。结果表明，粒径越大、长径比越大，障碍物表面的惯性和引力捕获越明显。此外，在高雷诺数条件下发生的布朗扩散和障碍物后形成的涡流主要影响细颗粒的运动轨迹。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2012 7th IEEE International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)

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