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The dynamics of electrically charged soot particles in a premixed ethylene flame

机译：预混乙烯火焰中带电烟灰颗粒的动力学

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摘要

A tandem differential mobility analyzer (DMA) is used to measure selectively the size distributions of soot particles carrying 0, ±1, ±2, ±3, and ±4 units of electrical charge. Near soot inception the size distribution is unimodal, with a mean diameter < 3 nm, and the particles are electrically neutral. With increasing height above the burner a bimodal size distribution evolves. The lower size mode remains electrically neutral with increasing height in the flame and retains its shape and intensity. In contrast, the upper mode includes progressively higher fractions of charged particles that reach levels of 33% positively and 33% negatively charged. At a fixed height, the size distribution narrows and shifts to a larger diameter as the number of charges per particle increases. At a fixed particle size, the number of charges obeys a Boltzmann distribution which is independent of height in the flame. These dynamics are examined in the context of a coagulation model that includes Coulomb forces and assumes small fractions of +1 and -1 particles are rapidly formed shortly after soot inception. The predictions closely mimic the observed evolution in charged particle size distributions and reproduce the experimentally observed Boltzmann charge distributions.
机译：串联微分迁移率分析仪（DMA）用于选择性地测量携带0，±1、2、3和4单位电荷的烟灰颗粒的尺寸分布。在接近烟灰开始时，尺寸分布是单峰的，平均直径<3 nm，并且颗粒是电中性的。随着燃烧器上方高度的增加，出现双峰尺寸分布。较低尺寸的模式会随着火焰高度的增加而保持电中性，并保持其形状和强度。相反，较高模式包括逐渐增加的带电粒子部分，这些带电粒子的正电荷级别达到33％，负电荷级别达到33％。在固定高度处，随着每个粒子的电荷数量增加，尺寸分布变窄并移动到更大的直径。在固定的粒径下，电荷数服从玻尔兹曼分布，而玻尔兹曼分布与火焰高度无关。在包括库仑力的凝结模型的上下文中检查了这些动力学，并假设在烟ot开始后不久就迅速形成了小部分的+1和-1颗粒。这些预测紧密模拟了观察到的带电粒度分布的演变，并重现了实验观察到的玻耳兹曼电荷分布。

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