Design and Performance of a Pumped Counterflow Virtual Impactor
Design and Performance of a Pumped Counterflow Virtual Impactor
复制标题
泵送逆流虚拟冲击器的设计和性能
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
D. Murphy
中科院分区：
文献类型：
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作者：
J. Boulter;D. Cziczo;A. Middlebrook;D. Thomson;D. Murphy
逆流虚拟碰撞利用与颗粒运动方向相反的气流将它们与气体和更小的颗粒分离开来。在过去，这种装置利用飞机飞行或风洞流动来给粒子提供动量。在这里，我们描述了一种装置的设计和性能，称为抽水逆流虚拟冲击器（PCVI），它使用真空泵来提供流量。我们表明，该装置能够以亚微米的截止直径进行惯性分离，颗粒增强接近输出流与输入流的比率，并将输出流中的环境气体替换为另一种可能更适合下游分析技术的气体。输入气体和小于截止直径的颗粒的截留率可超过99.9%。
Counterflow virtual impaction uses a flow of gas in a direction opposite the motion of the particles to separate them from gas and smaller particles. In the past such devices have used aircraft flight or wind tunnel flow to impart momentum to the particles. Here we describe the design and performance of an apparatus, termed a pumped counterflow virtual impactor (PCVI), which uses a vacuum pump to provide the flow. We show that this device is capable of inertial separation with a sub-micrometer cutoff diameter, particle enhancement approaching the ratio of the output to the input flow, and replacement of the ambient gas in the output flow with another gas that may be more suitable for downstream analysis techniques. Rejection of input gas and particles smaller than the cutoff diameter can exceed 99.9%.