Abstract Chinese cooking produces large numbers of particles that can cause both indoor and outdoor air quality problems. To reduce the extraction of particles to the outdoor air, this investigation studied capture efficiency of a rotating disk in an exhaust hood. The studies were performed experimentally in a wind tunnel and numerically by computational fluid dynamics (CFD) models with the Lagrangian method for tracking particle trajectories. The experimental data were used to identify the best turbulence model among the three tested in the CFD simulations. The results show that the capture efficiency increased with disk rotation speed and particle size but decreased with exhaust airflow rate. The CFD simulations provided detailed information about the mechanisms by which particles of different sizes were captured by the rotating disk. CFD was then used to explore two methods for improving the capture efficiency: adding more wires to the middle and outer zones of the disk, and using two layers of disks. Both methods can increase the capture efficiency of the rotating disk at an acceptable pressure loss. Copyright © 2020 American Association for Aerosol Research

中文翻译：

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通过厨房排烟罩中的旋转盘捕获颗粒

摘要 中式烹饪会产生大量颗粒，导致室内和室外空气质量问题。为了减少室外空气中的颗粒物提取，本研究研究了排气罩中旋转盘的捕获效率。这些研究是在风洞中通过实验进行的，并通过计算流体动力学 (CFD) 模型和用于跟踪粒子轨迹的拉格朗日方法进行数值计算。实验数据用于在 CFD 模拟中测试的三个中确定最佳湍流模型。结果表明，捕集效率随着圆盘转速和颗粒尺寸的增加而增加，但随着排风量的增加而降低。CFD 模拟提供了有关不同尺寸粒子被旋转盘捕获的机制的详细信息。然后使用 CFD 探索了两种提高捕获效率的方法：在磁盘的中间和外部区域添加更多电线，以及使用两层磁盘。这两种方法都可以在可接受的压力损失下提高转盘的捕获效率。版权所有 © 2020 美国气溶胶研究协会