Classification of Volatile Engine Particles

Journal Article · Tue Jan 01 04:00:00 EST 2013 · Aerosol Air Quality Research

DOI:https://doi.org/10.4209/aaqr.2013.01.0011· OSTI ID:1090482

Cheng, Mengdawn ^[1]

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1. ORNL

Volatile particles cannot be detected at the engine exhaust by an aerosol detector. They are formed when the exhaust is mixed with ambient air downstream. Lack of a precise definition of volatile engine particles has been an impediment to engine manufacturers and regulatory agencies involved in the development of an effective control strategy. It is beyond doubt that volatile particles from combustion sources contribute to the atmospheric particulate burden, and the effect of that contribution is a critical issue in the ongoing research in the areas of air quality and climate change. A new instrument, called volatile particle separator (VPS), has been developed. It utilizes a proprietary microporous metallic membrane to separate particles from vapors. VPS data were used in the development of a two-parameter function to quantitatively classify, for the first time, the volatilization behavior of engine particles. The value of parameter A describes the volatilization potential of an aerosol. A nonvolatile particle has a larger A-value than a volatile one. The value of parameter k, an effective evaporation energy barrier, is found to be much smaller for small engine particles than that for large engine particles. The VPS instrument provides a means beyond just being a volatile particle remover; it enables a numerical definition to characterize volatile engine particles.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: ORNL work for others
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1090482
• Journal Information: Aerosol Air Quality Research, Journal Name: Aerosol Air Quality Research Journal Issue: 5 Vol. 13; ISSN 1680-8584
• Country of Publication: United States
• Language: English

Related Subjects

Engine emission
Particle separation
Ultrafine aerosol.
Volatilization