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Modeling deposition of particles in vertical square ventilation duct flows

机译：模拟垂直方形通风管道流中的颗粒沉积

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摘要

The presence, flow, and distribution of particle in heating, ventilation, and air-conditioning (HVAC) ducts influence the quality of air in buildings and hence the health of building occupants. To shed a better light on the flow of particles in HVAC ducts this a paper has considered the effects of drag, lift force, gravity, Brownian diffusion, and turbulent diffusion on the dimensionless deposition velocity of particles in smooth vertical ventilation ducts using fully developed and developing velocity profiles. Based on the Reynolds stress transport model (RSM) at two different air velocities, 3.0 m/s and 7.0 m/s, the afore-mentioned effects were predicted using Reynolds-averaged Navier-Stokes (RANS)-Lagrangian simula-tion on square shaped ducts under vertical flows. Preliminary results suggest that the gravity of particles does not directly change the dimensionless deposition velocity in vertical flows. Nevertheless, the gravity of particles contributes to changing the Saffman lift force. It is thus the Saffman lift force that directly changes the dimensionless deposition velocity of particles in vertical flows. In addition, the difference in the dimensionless deposition velocities between fully developed and developing flows is owing to the turbulent diffusion, turbulent intensity, and needless to say, the Saffman lift force under different dimensionless particle relaxation time.
机译：加热，通风和空调（HVAC）管道中颗粒的存在，流动和分布会影响建筑物中的空气质量，从而影响建筑物居民的健康。为了更好地了解HVAC管道中的颗粒流，本文充分考虑了阻力，升力，重力，布朗扩散和湍流扩散对光滑垂直通风管道中颗粒无量纲沉积速度的影响。发展速度剖面。基于两种不同风速下的雷诺应力传递模型（RSM），分别为3.0 m / s和7.0 m / s，使用雷诺平均Navier-Stokes（RANS）-拉格朗日模拟法在正方形上预测了上述影响垂直流下的异形管道。初步结果表明，颗粒的重力不会直接改变垂直流中无量纲的沉积速度。然而，粒子的重力有助于改变萨夫曼升力。因此，正是萨夫曼提升力直接改变了垂直流中颗粒的无量纲沉积速度。另外，充分发展的和发展中的流动之间的无量纲沉积速度的差异是由于湍流扩散，湍流强度以及不用说，在不同的无量纲颗粒弛豫时间下的萨夫曼提升力所致。

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