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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Monte Carlo simulation of aerosol evolution in a planar mixing layer
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Monte Carlo simulation of aerosol evolution in a planar mixing layer

机译：平面混合层内气溶胶演变的蒙特卡洛模拟

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Purpose - The purpose of this paper is to investigate aerosol evolution in a planar mixing layer from a Lagrangian point of view. After using Monte Carlo (MC) method to simulate the evolution of aerosol dynamics along particles trajectories, the particles size distributions are obtained, which are unavailable in mostly used methods of moments. Design/methodology/approach - Nucleation and growth of dibutyl phthalate (DBP) particles are simulated using the quadrature method of moments in a planar mixing layer, where a fast hot stream with DBP vapor is mixing with a slow cool stream without vapor. Trajectories of aerosol particles are recorded. MC method is used to simulate the aerosol evolution along trajectories. Findings - Investigation on aerosol evolution along the trajectories prompts to classify these trajectories into three groups: first, trajectories away from the active nucleation zone; second, trajectories starting from the active nucleation zone; and third, trajectories crossing over the active nucleation zone. Particle size distributions (psds) along selected representative trajectories are investigated. The psd evolution exhibits interesting behavior due to the synthetic effects of nucleation and condensation. Condensation growth tends to narrow down the psd, and form a sharp front on the side of big particle size. Nucleation is able to broaden the psd through generating the smallest particles. The duration and strength of nucleation have significant effect on the shape of psd. Originality/value - As far as the authors knowledge, it is the first simulation of aerosol evolution that takes a Lagrangian point of view, and uses MC simulation along particles trajectories to provide the particles size distribution.
机译：目的-本文的目的是从拉格朗日角度研究平面混合层中的气溶胶演变。在使用蒙特卡洛（MC）方法模拟气溶胶动力学沿粒子轨迹的演变之后，获得了粒径分布，这在大多数常用的矩量法中是不可用的。设计/方法/方法-在平面混合层中使用矩量的正交方法模拟邻苯二甲酸二丁酯（DBP）颗粒的形核和生长，在该混合层中，具有DBP蒸气的快速热流与没有蒸气的缓慢冷却的流混合。记录气溶胶颗粒的轨迹。 MC方法用于模拟气溶胶沿轨迹的演变。研究结果-对沿着轨迹的气溶胶演化的调查提示将这些轨迹分为三类：第一，远离活动成核区的轨迹；第二，远离活动成核区的轨迹。第二，从活动成核区开始的轨迹；第三，跨越活动成核区的轨迹。研究了沿所选代表轨迹的粒度分布（psds）。由于成核和凝结的综合作用，psd演变表现出有趣的行为。凝结的增长趋向于缩小psd，并在大粒径一侧形成锋利的前端。成核能够通过产生最小的颗粒来扩大psd。成核的持续时间和强度对psd的形状有重要影响。原创性/价值-就作者所知，这是第一个采用拉格朗日观点的气溶胶演变模拟，并使用沿粒子轨迹的MC模拟来提供粒子尺寸分布。

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