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Axial flow cyclone for segregation and collection of ultrafine particles: Theoretical and experimental study

机译：轴流旋流器分离和收集超细颗粒：理论和实验研究

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In this study, an axial flow cyclone was designed, fabricated, and evaluated at different conditions of air flow rates (Q(0)) and low-pressure environments (P), especially for the segregation and collection of ultrafine particles. An evaporation/condensation type of aerosol generation system consisting of tube furnace and mixing chamber was employed to produce test aerosols. The test aerosol was then classified by a differential mobility analyzer (DMA) and number concentration was measured by a condensation nuclei counter (CNC) and an electrometer upstream and downstream of the cyclone, respectively. The s-shaped curve of the collection efficiency in submicron particle size range was obtained to be similar to the traditional cyclone found in the literatures when the particles were largerthan 40 nm at Q(0) = 1.07, 0.455 L(STP)/min, and P= 4.8-500 Torr. The curve was found to be fitted very well by a serniempirical equation described in this paper. Forparticles smaller than 40 nm, however, the collection efficiency was unusually increased as the particle diameter was decreased due to the fact that the diffusion deposition becomes the dominant collection mechanism in the low pressure conditions. A model composed of centrifugal force and diffusion deposition is presented and used to fit the experimental data. The cyclone was demonstrated to separate and collect ultrafine particles effectively in the tested vacuum conditions.
机译：在这项研究中，设计了轴流旋风分离器，并在不同的空气流量（Q（0））和低压环境（P）条件下对其进行了评估，特别是对于超细颗粒的分离和收集。由管式炉和混合室组成的蒸发/冷凝型气雾生成系统被用来生产测试气雾。然后用差示迁移率分析仪（DMA）对测试气溶胶进行分类，并分别通过旋风分离器上游和下游的缩合核计数器（CNC）和静电计测量浓度。当颗粒在Q（0）= 1.07，0.455 L（STP）/ min时大于40 nm时，获得亚微米粒径范围内收集效率的s形曲线类似于文献中发现的传统旋风分离器。和P = 4.8-500托。通过本文中描述的经验方程，发现曲线拟合得很好。但是，对于小于40 nm的颗粒，由于扩散沉积在低压条件下成为主要的收集机理，因此随着粒径的减小，收集效率会异常增加。提出了由离心力和扩散沉积组成的模型，并将其用于拟合实验数据。在测试的真空条件下，旋风分离器可以有效地分离和收集超细颗粒。

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