Theoretical Analyses of Aerosol Aging on a Substrate without Wall-Effects by a Cross-Flow
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Published:2011-12-14
Issue:1
Volume:5
Page:106-113
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ISSN:1874-2823
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Container-title:The Open Atmospheric Science Journal
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language:en
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Short-container-title:TOASCJ
Author:
P. Cowin James,Yang Xin,Yu Xiao-Ying,J. Iedema Martin
Abstract
Long time (~1day) aging or reactions of aerosol is typically studied using either large aerosol chambers (>10 m3) or particles supported on a substrate to minimize wall effects. To avoid wall effects in the latter, it is often essential that the wall reactivity be extremely small (<10-5 reactions per encounter) and that the particle loadings be very small (<1 pg/cm2) to eliminate transport-limited trace gas depletion near the particles and substrate. We evaluate here a cross-flow approach, which greatly reduces these constraints. Particles are to be supported on a micromesh (~50% or more open area) through which the reactive gas is drawn at around a few hundred cm/s. The analysis shows how the competitions between flow and diffusion establishes a “zone of isolation” several microns wide around each reactive particle, outside of which the reactivity of other particles or the substrate is irrelevant to the local reactions. This cross-flow approach reduces the effects of substrate and collective particle reactivity typically orders of magnitude, and will facilitate aging studies of
supported aerosols.
Publisher
Bentham Science Publishers Ltd.
Subject
Atmospheric Science
Cited by
1 articles.
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