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Simulation of acoustic particle agglomeration in poly-dispersed aerosols

机译：多分散气溶胶中声颗粒聚集的仿真

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This report presents application of the MD for the simulation of acoustic agglomeration of poly-disperse aerosol particles. The conventional time-driven MD approach was applied and in-house developed MD code was modified for simulation purposes. The aerosol is assumed to be a system of dispersed spherical fluid particles while the agglomeration may occur between initial smaller particles sequentially forming larger particles. The modelled processes include the agglomeration due to the orthokinetic and acoustic wake mechanisms. Orthokinetic agglomeration refers to the agglomeration due to direct collisions between particles that are entrained at different velocities in the oscillatory motion of the sound field. Acoustic wake mechanisms are those that produce particle interactions through the surrounding medium because of hydrodynamic forces and the asymmetry of the flow field around the particle. It is assumed that the particles collide and agglomerate due to the interactions induced by sound waves. The aggregates formed during the agglomeration process were characterised as aggregates with a different radius to estimate the average radius of the primary particles in individual aggregates. The MD model was validated by comparison against the available analytical solutions. Finally, interaction process of two and four particles investigated and presented.
机译：本报告呈现MD的应用，以模拟多分散气溶胶颗粒的声学凝聚。应用传统的时间驱动MD方法，并在内部开发的MD代码被修改以进行仿真目的。假设气溶胶是分散的球形流体颗粒的系统，同时可以在依次形成较大颗粒的初始粒子之间发生聚集。建模的方法包括由于正交和声学唤醒机制引起的聚集。正交凝聚是指引起的颗粒之间的直接碰撞引起的聚集在声场的振荡运动中的不同速度下。声唤醒机制是由于流体动力和颗粒周围的流场的不对称性产生通过周围介质的颗粒相互作用的机构。假设颗粒由于声波引起的相互作用而碰撞和附聚。在附聚过程中形成的聚集体表征为具有不同半径的聚集体，以估计单个聚集体中初级颗粒的平均半径。通过与可用的分析解决方案进行比较验证MD模型。最后，研究和呈现了两种和四种颗粒的相互作用过程。

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