Modeling the mass transfer of semivolatile organics in combustion aerosols

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Environmental Science and Technology; (United States)

DOI:https://doi.org/10.1021/es00062a011· OSTI ID:6645174

Odum, J R; Yu, J; Kamens, R M ^[1]

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1. Univ. of North Carolina, Chapel Hill, NC (United States)

A radial diffusion model was developed to describe the dynamic mass transfer of semivolatile organics into and out of combustion aerosols. The model combustion aerosol consists of a solid carbon core that is surrounded by a viscous, liquid-like, organic layer. Diffusion takes place only within the organic layer and is controlled by mass transfer at the particle surface. Modeling of semivolatiles requires the tuning of two separate parameters: a diffusion coefficient (D) and a surface mass transfer coefficient ([alpha]). Preliminary testing of the model on the uptake of deuterated pyrene by diesel exhaust aerosol at a temperature of 25[degree]C suggests that diffusion coefficients for PAH are of the order of 10[sup [minus]15] cm[sup 2]/s and that surface mass transfer coefficients for pyrene are of the order of 10[sup [minus]10] cm/s. 24 refs., 8 figs.

• OSTI ID: 6645174
• Journal Information: Environmental Science and Technology; (United States), Journal Name: Environmental Science and Technology; (United States) Vol. 28:13; ISSN ESTHAG; ISSN 0013-936X
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330102 -- Internal Combustion Engines-- Diesel
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
54 ENVIRONMENTAL SCIENCES
540110*
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
AEROSOLS
AROMATICS
COLLOIDS
COMBUSTION PRODUCTS
CONDENSED AROMATICS
DEUTERIUM COMPOUNDS
DIESEL ENGINES
DIFFUSION
DISPERSIONS
ENGINES
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
HUMIDITY
HYDROCARBONS
HYDROGEN COMPOUNDS
INTERNAL COMBUSTION ENGINES
MASS TRANSFER
MATHEMATICAL MODELS
MATTER
ORGANIC COMPOUNDS
POLYCYCLIC AROMATIC HYDROCARBONS
PYRENE
SAMPLING
SMOG
SOLS
TEMPERATURE DEPENDENCE
VOLATILE MATTER
WASTES