3D numerical study of wire-cylinder precipitator for collecting ultrafine particles from diesel exhaust

N. Farnoosh, K. Adamiak, G. Castle
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引用次数: 3

Abstract

A precipitator section is modeled numerically in 3D to determine the collection efficiency for conductive diesel exhaust particulates. It consists of a circular tube and a wire electrode mounted at the center of the tube, supplied with a negative high dc voltage, while the tube is electrically grounded. The analytical solutions of Poisson and current continuity equations are implemented to obtain the ionic space charge density and electric potential distributions in the channel. Commercial CFD FLUENT software is used to solve the k-ε turbulent flow model, while also considering the electrical body forces. Particle charging and motion equations are solved using Discrete Phase Model (DPM) feature of the FLUENT and programming User Defined Functions (UDFs). Particles are assumed to be charged by combined field and diffusion charging mechanisms. Effects of some electrical characteristics of diesel exhaust particulates, such as charge-to-mass ratio and particle migration velocity, on collection efficiency are assessed. Patterns of particle deposition along the channel are evaluated and compared for different particle sizes. Numerical modeling of the 3D EHD flow pattern induced by corona discharge is demonstrated in the cross section of the tube when the corona wire is slightly off-center (eccentric) in an arbitrary direction.
线筒除尘器收集柴油机尾气中超细颗粒的三维数值研究
采用三维数值模拟的方法,确定了对导电性柴油机排气微粒的收集效率。它由一个圆管和一个安装在管中心的电极线组成,提供负的高直流电压,而管是电接地的。通过泊松方程和电流连续性方程的解析解,得到了通道内离子空间电荷密度和电势分布。采用商用CFD FLUENT软件求解k-ε湍流模型,同时考虑电体力。利用FLUENT的离散相位模型(DPM)特性和编程用户定义函数(udf)求解粒子的电荷和运动方程。假设粒子通过场和扩散联合带电机制带电。评估了柴油尾气微粒的电荷质量比和微粒迁移速度等电学特性对收集效率的影响。对不同粒径的颗粒沿河道沉积的模式进行了评价和比较。数值模拟了电晕导线在任意方向稍有偏离中心时,管截面内电晕放电引起的三维EHD流场。
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