Previous work showed that particle behaviors in ultrasonic atomization pyrolysis (UAP) reactor have a great influence on the transport and collection of particles. In this study, the effects of droplet behaviors (i.e. droplet collision and breakage) and solvent evaporation on the droplet size, flow field and collection efficiency during the preparation of ZnO particles by UAP were investigated. The collision, breakage and solvent evaporation conditions which affect the droplet size distribution and flow pattern were considered in CFD simulation based on Eulerian-Lagrangian method. The results showed that droplet collision and breakage would increase the droplet size, broaden the droplet size distribution and hinder the transport of droplets. Solvent evaporation obviously changed the flow pattern of droplets. In addition, both droplet behaviors and solvent evaporation reduced the collection efficiency. This study could provide detail information for better understanding the effect of droplet behaviors and solvent evaporation on the particle production process via UAP reactor.

中文翻译：

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超声雾化热解反应器的CFD模拟：液滴行为和溶剂蒸发的影响

先前的工作表明，超声雾化热解（UAP）反应器中的颗粒行为对颗粒的运输和收集有很大的影响。在这项研究中，研究了在UAP制备ZnO颗粒过程中，液滴行为（即液滴碰撞和破裂）和溶剂蒸发对液滴尺寸，流场和收集效率的影响。在基于欧拉-拉格朗日法的CFD模拟中考虑了影响液滴尺寸分布和流型的碰撞，破裂和溶剂蒸发条件。结果表明，液滴的碰撞和破裂会增加液滴的尺寸，加宽液滴的尺寸分布，并阻碍液滴的运输。溶剂蒸发明显改变了液滴的流动方式。此外，液滴行为和溶剂蒸发都会降低收集效率。这项研究可以提供详细的信息，以更好地了解液滴行为和溶剂蒸发对通过UAP反应器进行的颗粒生产过程的影响。