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Experimental and numerical study of airflow pattern and particle dispersion in a vertical ventilation duct

机译：垂直通风管道中气流模式和颗粒扩散的实验和数值研究

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A numerical simulation has been conducted to investigate the behavior of airflow and the dispersion of size-dependent particles in the ventilation duct. To examine the prediction accuracy for our numerical simulation, we compared computational fluid dynamics (CFD) results with particle image velocimetry (PIV) measurement data of airflow in an isothermal duct model. The low Reynolds number type k-ε turbulent model was selected for further calculation because its predictions were the most accurate in this study. A size-dependent particle transport approach, combining the Eulerian approach with low Reynolds k-ε turbulent model and Lagrangian particle trajectory tracking, was adopted to investigate the airflow pattern and particle removal efficiency in the ventilation duct. Two scenarios, one with and one without a baffle, were also compared to determine the effects on the particle transport mechanisms. We compared the effectiveness of particle removal as by using the simulated results, which showed that the fraction of coarse particles retained were higher than the fraction of fine particles retained. We found that a vertical duct with a baffle in a perfect sink condition on the wall surfaces increased particle deposition and decreased particle escape. Because of the two opposing particle removal mechanisms, i.e., deposition and escape, the impact of thermophoresis on particle retaining behavior was not as significant as that of airflow velocities.
机译：进行了数值模拟，以研究气流的行为以及尺寸依赖性颗粒在通风管道中的分散。为了检查数值模拟的预测准确性，我们在等温风管模型中将计算流体动力学（CFD）结果与气流的颗粒图像测速（PIV）测量数据进行了比较。选择低雷诺数类型的k-ε湍流模型进行进一步计算，因为其预测在本研究中最准确。采用尺寸依赖的颗粒传输方法，将欧拉方法与低雷诺兹k-ε湍流模型和拉格朗日颗粒轨迹跟踪相结合，以研究通风管道中的气流模式和颗粒去除效率。还比较了两种情况，一种有挡板，一种没有挡板，以确定对粒子传输机制的影响。我们通过模拟结果比较了颗粒去除的有效性，结果表明保留的粗颗粒比例高于保留的细颗粒比例。我们发现，在壁面具有理想下沉状态的带有挡板的垂直风道增加了颗粒沉积，并减少了颗粒逸出。由于两种相反的颗粒去除机理，即沉积和逸出，热泳对颗粒保持性能的影响不如气流速度显着。

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