Abstract Various industrial applications such as medical/pharmaceutical sprays, heating, ventilation and air conditioning systems, and other solid/liquid atomization processes benefit from the characterization of flow and deposition mechanisms of solid/liquid aerosols. This work aimed to experimentally study the transport of solid and liquid aerosol particles which represented aerosolized fission products in a nuclear reactor. We measured the flow field, free-stream concentration, and surface deposition of solid/liquid aerosols flowing in a horizontal square channel with Reynolds number of 750–7, 000. Particle image velocimetry (PIV) was applied to acquire the flow field characteristics such as mean velocity fields and turbulent kinetic energy. The effects of Reynolds number and particle diameter were investigated by studying the particle deposition and penetration of two micron-sized particle types. The experimental results of particle deposition velocity agreed well with the correlations published previously and with the associated numerical results. For the Reynolds numbers tested in this study, solid and liquid particle deposition was found to be governed by gravitational sedimentation. Increasing the Reynolds number for a given particle diameter increased the particle relaxation time and penetration efficiency but decreased the particle deposition velocity. Decreasing the particle diameter for a given Reynolds number increased the effect of gravitation sedimentation. By altering the surface properties with the addition of a carbon nanotube coating, the penetration was shown to decrease for the same flow conditions when compared with a smooth surface. Secondary flow vortices located in the corners, unique to turbulent flow in a square channel, were experimentally shown to increase particle deposition in the corners. Copyright © 2020 American Association for Aerosol Research

中文翻译：

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水平方形通道中固液气溶胶输运实验研究

摘要 各种工业应用，如医疗/制药喷雾、加热、通风和空调系统以及其他固/液雾化过程，都受益于固/液气溶胶的流动和沉积机制的表征。这项工作旨在通过实验研究代表核反应堆气雾化裂变产物的固体和液体气溶胶粒子的传输。我们测量了在雷诺数为 750–7, 000 的水平方形通道中流动的固体/液体气溶胶的流场、自由流浓度和表面沉积。应用粒子图像测速 (PIV) 来获取流场特征，例如作为平均速度场和湍流动能。通过研究两种微米级颗粒类型的颗粒沉积和渗透，研究了雷诺数和颗粒直径的影响。粒子沉积速度的实验结果与先前发表的相关性以及相关的数值结果非常吻合。对于本研究中测试的雷诺数，发现固体和液体颗粒沉积受重力沉降控制。对于给定的粒径，增加雷诺数会增加颗粒弛豫时间和渗透效率，但会降低颗粒沉积速度。对于给定的雷诺数，减小粒径会增加重力沉降的影响。通过添加碳纳米管涂层来改变表面特性，与光滑表面相比，在相同的流动条件下，渗透率会降低。位于角落的二次流涡流是方形通道中的湍流所特有的，实验表明会增加角落中的颗粒沉积。版权所有 © 2020 美国气溶胶研究协会