The industrial release of submicron aerosol particles at workplace could cause undue health effect on workers. To effectively capture and remove airborne particles, we need to study the characteristics of various interactive particle motion forces (drag force, Brownian force, Saffman lift force, etc.) and the dispersion of these aerosol particles in indoor air. In this study, the dominant force of submicron particles was determined by calculating the acting forces with different particle sizes. Then, a Discrete Particle Model (DPM) was used to calculate the trajectory of particle movement in turbulent thermal plume flow. Horizontal dispersity (D_H) was defined to evaluate the horizontal diffusion of the particulate matter. The impact of different particle diameters, heat source temperatures and initial relative velocities on D_H was investigated. This study showed that the main acting forces for submicron aerosol particles were drag force, Brownian force, Saffman lift force and thermophoresis force. Brownian force cannot be ignored when the particle diameter was below 0.3 µm, which would promote the irregular movement of particles in space and enhance their diffusion ability. The smaller the particle size, the higher the heat source temperature and the lower the particles' initial velocity would lead to the increase of D_H.

在工作场所工业释放亚微米气溶胶颗粒可能会对工人造成不适当的健康影响。为了有效地捕获和清除空气中的颗粒，我们需要研究各种相互作用的颗粒运动力（拖动力，布朗力，萨夫曼升力等）的特性以及这些气溶胶颗粒在室内空气中的分散情况。在这项研究中，通过计算不同粒径的作用力来确定亚微米颗粒的主导力。然后，使用离散粒子模型（DPM）来计算湍流热羽流中粒子运动的轨迹。水平分散度（d _ħ定义）以评估颗粒物质的水平扩散。研究了不同粒径，热源温度和初始相对速度对D _H的影响。研究表明，亚微米气溶胶颗粒的主要作用力为阻力，布朗力，萨夫曼升力和热泳力。当粒径小于0.3μm时，布朗力不容忽视，布朗力会促进颗粒在空间中的不规则运动并增强其扩散能力。颗粒尺寸越小，热源温度越高，颗粒的初始速度越低，导致D _H增加。