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Use of a Berner Low-Pressure Impactor at Low Inlet Pressures. Application to the Study of Aerosols and Vapors at High Temperature

机译:在低进口压力下使用Berner低压冲击器。在高温气溶胶和蒸气研究中的应用

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摘要

The behavior of a Berner-type low-pressure impactor operated at low inlet pressures (down to 0.04 bar) has been studied both theoretically and experimentally. The stage cut diameters have been found to decrease with inlet pressure, the general behavior of the impactor being similar to that of the atmospheric case down to 0.1 bar. At this inlet pressure, particles in the range 3-100 nm are classified along six different impactor stages, which offer the possibility of studying, e.g., freshly nucleated aerosols. The impactor so operated has been applied to the study of aerosol formation in biomass combustion, connected to the exit of a probe used in a previous work. The results presented in this article confirm and complement the conclusions of that work regarding submicron particle formation (i.e., nucleation of alkali sulfate occurs first and is followed by chloride condensation at lower temperatures) and also illustrate the possibilities of the impactor operated at low pressures. Finally, the relevance of diffusion on the collection efficiency of the successive stages is briefly discussed.
机译:理论上和实验上都研究了在低进口压力(低至0.04 bar)下运行的Berner型低压冲击器的性能。已经发现,级切割直径随入口压力而减小,冲击器的一般性能类似于大气压情况下低至0.1 bar的情况。在此入口压力下,沿着六个不同的撞击级将3-100 nm范围内的颗粒分类,这为研究例如新成核的气溶胶提供了可能性。如此操作的撞击器已被用于研究生物质燃烧中的气溶胶形成,该撞击器与先前工作中使用的探针的出口相连。本文提供的结果证实并补充了有关亚微米颗粒形成的工作结论(即首先发生碱金属硫酸盐的成核,然后在较低温度下发生氯化物缩合),还说明了撞击器在低压下运行的可能性。最后,简要讨论了扩散与后续阶段收集效率的相关性。

著录项

  • 来源
    《Aerosol Science and Technology》 |2011年第7期|p.861-871|共11页
  • 作者单位

    LITEC, CSIC (Spanish Council for Scientific Research), Zaragoza, Spain Fluid Mechanics Group/LITEC, University of Zaragoza, Zaragoza, Spain;

  • 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 00:57:41

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