Radial diffusion and penetration of gas molecules and aerosol particles through laminar flow reactors, denuders, and sampling tubes

Analytical Chemistry
Daniel A KnopfManabu Shiraiwa

Abstract

Flow reactors, denuders, and sampling tubes are essential tools for many applications in analytical and physical chemistry and engineering. We derive a new method for determining radial diffusion effects and the penetration or transmission of gas molecules and aerosol particles through cylindrical tubes under laminar flow conditions using explicit analytical equations. In contrast to the traditional Brown method [Brown, R. L. J. Res. Natl. Bur. Stand. (U. S.) 1978, 83, 1-8] and CKD method (Cooney, D. O.; Kim, S. S.; Davis, E. J. Chem. Eng. Sci. 1974, 29, 1731-1738), the new approximation developed in this study (known as the KPS method) does not require interpolation or numerical techniques. The KPS method agrees well with the CKD method under all experimental conditions and also with the Brown method at low Sherwood numbers. At high Sherwood numbers corresponding to high uptake on the wall, flow entry effects become relevant and are considered in the KPS and CKD methods but not in the Brown method. The practical applicability of the KPS method is demonstrated by analysis of measurement data from experimental studies of rapid OH, intermediate NO3, and slow O3 uptake on various organic substrates. The KPS method also allows dete...Continue Reading

References

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Oct 25, 2011·Physical Chemistry Chemical Physics : PCCP·Daniel A KnopfJonathan H Slade
May 19, 2012·Environmental Science & Technology·Manabu ShiraiwaDaniel A Knopf

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Citations

May 12, 2021·Environmental Science & Technology·Jienan Li, Daniel A Knopf
Dec 10, 2016·The Journal of Physical Chemistry. a·Madeline R LedererRyan Z Hinrichs
Nov 17, 2020·The Journal of Physical Chemistry. a·Stephanie R SchneiderJonathan P D Abbatt

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