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Large eddy simulation of electrostatic effect on particle transport in particle-laden turbulent pipe flows
Journal of Electrostatics ( IF 1.8 ) Pub Date : 2020-12-21 , DOI: 10.1016/j.elstat.2020.103542
Jinzhui Li , Jun Yao , Yanlin Zhao , Chi-Hwa Wang

Electrostatic effect on particle transport in particle-laden turbulent pipe flows at Reb = 44000 was investigated by coupling LES with Lagrange particle tracking technology. The particle governing equation included drag force, lift force and electrostatic force. Triboelectrification and collision electrification were basically considered for particle charging ways in the particle-laden turbulent pipe flows. In this work, three particle St numbers (3.9, 35.6, 142.2) were considered to compare the electrostatic effect on particle behavior. It was found that in the near-wall region, electrostatics destroyed particle aggregation around the vortex structure. Particle-ejection delay effect and particle-sweep premature effect were then proposed in boundary layer due to electrostatics.

Electrostatics affected particle distribution and that became more significant with electrostatics increasing. Electrostatics prevented particles from ejecting as particle-ejection delay effect and accelerated particle moving and caused premature occurrence of particle sweep as particle-sweep premature effect. Charged particles were observed to distribute in the low-speed streaks, high-speed streaks, and the region between them, which was caused by particle-ejection delay and particle-sweep premature. It can be concluded that in the turbulent pipe flows electrostatic effect destroyed particle normal distribution under single turbulence effect.



中文翻译:

静电对含颗粒湍流管道中颗粒传输的大涡模拟

载尘湍流管道中的静电对颗粒输运的影响 [RËb 通过将LES与Lagrange粒子跟踪技术结合使用,研究了44000。粒子控制方程包括阻力,升力和静电力。满载湍流管道中的颗粒充电方式基本上考虑了摩擦带电和碰撞带电。在这项工作中,考虑了三个粒子St数(3.9、35.6、142.2)来比较静电对粒子行为的影响。发现在近壁区域,静电破坏了涡旋结构周围的颗粒聚集。由于静电,在边界层中提出了粒子喷射延迟效应和粒子扫描过早效应。

静电会影响粒子分布,并且随着静电的增加而变得更加重要。静电阻止了作为粒子喷射延迟效应的粒子喷射和加速了粒子移动,并由于粒子掠过早效应而导致了粒子扫掠的过早发生。观察到带电粒子分布在低速条纹,高速条纹以及它们之间的区域中,这是由粒子喷射延迟和粒子扫过早引起的。可以得出结论,在单湍流作用下,湍流管中的静电作用破坏了颗粒的正态分布。

更新日期:2020-12-21
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