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An Asymptotic Analysis of Differential Electrical Mobility Classifiers

机译:差分电迁移率分类器的渐近分析

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摘要

An asymptotic analysis of balanced flow operations of differential mobility analyzers (DMAs) and a new class of instruments that includes opposed migration aerosol classifiers (OMACs) and inclined grid mobility analyzers (IGMAs) provides new insights into the similarities and differences between the devices. The characteristic scalings of different instruments found from minimal models are shown to relate the resolving powers, dynamic ranges, and efficiencies of most such devices. The resolving powers of all of the instruments in the nondiffusive regime of high voltage classifications, , is determined by the ratio of the flow rate of the separation gas (sheath or crossflow) to that of the aerosol. At low voltage, when diffusion degrades the classification, the OMAC and the IGMA share an factor advantage in dynamic range of mobilities over the DMA, although the OMAC also suffers greater losses because diffusion immediately deposits particles onto its porous electrodes. On the basis of this analysis, a single master operating diagram is proposed for DMAs, OMACs, and IGMAs. Analysis of this operating diagram and its consequences for the design of differential electrical mobility classifiers suggests that OMACs and IGMAs also have advantages over DMAs in design flexibility and miniaturization. Most importantly, OMACs and IGMAs may outperform DMAs for the currently difficult classification of particles with diameters less than 10 nm. On the other hand, DMAs are more amenable to voltage scanning-mode operation to enable accelerated size distribution measurements, whereas it is most convenient to operate OMACs and IGMAs in voltage stepping-mode operation.
机译:差动迁移率分析器(DMA)的平衡流操作的渐近分析以及包括相对的迁移气溶胶分级器(OMAC)和倾斜网格迁移率分析器(IGMA)在内的一类新型仪器为设备之间的异同提供了新的见解。从最小模型中发现的不同仪器的特性缩放比例显示出与大多数此类设备的分辨能力,动态范围和效率相关。在高压分类的非扩散状态下,所有仪器的分辨能力取决于分离气体(鞘流或错流)的流速与气溶胶流速的比值。在低电压下,当扩散使分类降级时,OMAC和IGMA在迁移率的动态范围方面比DMA共享一个因素优势,尽管OMAC也遭受更大的损失,因为扩散会立即将颗粒沉积到其多孔电极上。在此分析的基础上,为DMA,OMAC和IGMA提出了一个主操作图。分析该工作图及其对差分电迁移率分类器设计的影响,表明OMAC和IGMA在设计灵活性和小型化方面也比DMA具有优势。最重要的是,对于目前直径小于10 nm的困难分类,OMAC和IGMA可能胜过DMA。另一方面,DMA更适合于电压扫描模式操作以实现加速的大小分布测量,而在电压步进模式操作中操作OMAC和IGMA最方便。

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  • 来源
    《Aerosol Science and Technology》 |2011年第6期|p.727-739|共13页
  • 作者单位

    Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-18 00:57:40

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