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Turbulent coagulation of micron and submicron particles in swirling flow

机译：微米和亚微米颗粒的湍流凝结在旋转流动中

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Coagulation of fine particles in turbulent swirling flow is investigated experimentally and numerically. First, different swirl producers are compared and helical blade is adopted due to its enhanced diffusion and convection in the radial direction. Then, study on structural parameters of helical blade is carried out, the result shows that smaller diameter of inner blades or shorter axial spacing between inner and outer blades can create better performance. Finally, research on the effect of operating parameters is conducted. The result implies that lower velocity or higher particle concentration helps improve coagulation performance, since diffusion and particle interaction are strongly affected by the turbulent two-phase flow field. The patterns of coagulation for micron and submicron particles are slightly different due to varied particle dynamics, specifically, breakup is an important factor for larger particles. Rising temperature has positive effect on coagulation of submicron particles because of enhanced thermal motions. Comparatively, the thermal effect is negligible for the micron particles. The study analyzed the mechanism behind turbulent coagulation in swirling flow, from which directions for optimal design are provided.
机译：在实验和数值上研究湍流旋转流动中的细颗粒的凝结。首先，使用不同的旋流生产者，并且由于其在径向方向上的增强扩散和对流而采用螺旋刀片。然后，执行螺旋刀片的结构参数的研究，结果表明内叶片的较小直径或内叶片之间的较短轴向间隔可以产生更好的性能。最后，对操作参数的影响进行了研究。结果意味着较低的速度或更高的颗粒浓度有助于改善凝固性能，因为扩散和颗粒相互作用受到湍流两相流场的强烈影响。由于多种颗粒动力学，微米和亚微米颗粒的凝血模式略有不同，具体而言，分离是较大颗粒的重要因素。由于增强的热运动，上升温度对亚微米颗粒的凝固具有积极影响。相比之下，微米颗粒可忽略不计。该研究分析了旋转流动湍流凝结后的机制，提供了优化设计的方向。

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