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Transport mechanisms of airborne particulate matters in partitioned indoor environment

机译：分隔室内环境中空气中颗粒物的传输机制

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摘要

The main objective of this study is to investigate the transport mechanisms of size-dependent airborne particulate matters in partitioned indoor environment. A three-dimensional Lagrangian particle tracking model is developed herein and validated by reliable experimental measurement. Four major particle-driving mechanisms (the gravitational force, the drag force, the Brownian motion force and the Saffman lift force) are considered in the model. Five kinds of particle transport mechanism scenarios are performed, including the dynamic equation scenario (all considered), the Brownian-motion-neglected scenario, the drag-force-neglected scenario, the lift-force-neglected scenario, and the inertial-force-neglected scenario (neglecting both the drag force and lift force). Seven different particle aerodynamic diameters (10, 5, 2.5, 1, 0.5, 0.1 and 0.05 urn), ranging from coarse to ultra-fine particle ranges, are used to investigate the relationship between particle size and each transport mechanism scenario. The results show that the influence of the drag force and the inertial force is significant for particle diameter larger than 1 μm, and the Brownian motion force is important for particle diameter smaller than 0.5 μm. The Saffman lift force cannot be neglected in a specific range of particle sizes between 2.5 and 5 μm.
机译：这项研究的主要目的是研究在分隔的室内环境中取决于尺寸的空气传播颗粒物的传输机制。本文开发了三维拉格朗日粒子跟踪模型，并通过可靠的实验测量对其进行了验证。模型中考虑了四个主要的粒子驱动机制（重力，阻力，布朗运动力和萨夫曼升力）。进行了五种粒子传输机制情景，包括动态方程情景（均已考虑），布朗运动忽略情景，拖动力忽略情景，升力忽略情景和惯性力情景。被忽略的情况（同时忽略了阻力和升力）。从粗颗粒到超细颗粒范围的七个不同的颗粒空气动力学直径（10、5、2.5、1、0.5、0.1和0.05 urn）用于研究颗粒尺寸与每种传输机制方案之间的关系。结果表明，对于大于1μm的粒径，拖曳力和惯性力的影响显着，对于小于0.5μm的粒径，布朗运动力则很重要。在2.5至5μm的特定粒径范围内，不能忽略萨夫曼提升力。

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