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Effect of Ambient Dilution on Coagulation of Particulate Matter in a Turbulent Dispersing Plume
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 04, 2002 by SAE International in United States
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In recent years, there has been an increasing need for accurately predicting the nucleation, coagulation, and dynamics of particulate matter (PM) emissions from diesel engines. The proposed United Sates Environmental Protection Agency (USEPA) standard on fine particles, is focused on allowing levels of 50 μg/m3 annual average concentration of PM10 (particles smaller than 10 μm aerodynamic diameter) and an additional annual average standard of 15 μg/m3 of fine particles smaller than 2.5 μm in the atmosphere. Existing legislation for particulates is however, based on measurement by mass but not on the particle number density. The current system does not properly account for the small particulates, mostly of the nucleation type, which have an insignificant mass despite being present in very high numbers. These small particulates in high numbers can contribute extremely large surface areas for biological interaction, and they can pose a serious health threat. To this end, the public health community, automotive industry and aerosol physicists are focusing their attention on developing sampling and measurement techniques that will enable a better understanding of the origin and fate of combustion generated particulate matter (soot). This paper discusses a numerical model that includes the effect of ambient dilution on coagulation of particulate matter emissions in the exhaust plume of a heavy-duty diesel-fueled truck. The integro-differential formulation of polydisperse coagulation equation is solved for the time dependent PM concentration using a semi-implicit finite difference scheme. In these simulations, measured PM data at 20″ (0.51 m) near the plume source is used as an initial condition. The PM size distribution and concentration variations at any spatial location are predicted by the numerical algorithm. This computational model is also validated with the experimental data collected by the West Virginia University researchers.
CitationKim, D., Gautam, M., and Gera, D., "Effect of Ambient Dilution on Coagulation of Particulate Matter in a Turbulent Dispersing Plume," SAE Technical Paper 2002-01-0652, 2002, https://doi.org/10.4271/2002-01-0652.
- Ahlvik, P. Ntxiachristos, L. Keskinen, J. Virtanen, A. 1998 “Real Time Measurements of Diesel Particle Size Distribution with an Electrical Low Pressure Impactor” SAE 980410
- Boyce, J. Mehta, S. Gautam, M. Clark, N.N. 2000 “Heavy Duty Diesel Truck Research in the ODU/Langley Wind Tunnel (CRC E-43)” 10 th CRC On-Road Vehicle Emissions Workshop San Diego, California March 27-29 2000
- Brown, J.E. Calyton, M.J. Harris, D.B. King, F.G. Jr. 2000 “Comparison of the Particle Size Distribution of Heavy-Duty Diesel Exhaust Using a Dilution Tailpipe Sampler and an In-Plume Sampler During On-Road Operation” Journal of Air & Waste Management Association 50 1407 1416
- Gautam, M. Xu, Z. Ayala, A. Mehta, S. 2000 “Diesel Exhaust Plume Studies: Wind Tunnel Experiments and Modeling” Fourth ETH Nanoparticle Measurement Workshop August 7 - 9 2000 Zurich
- Jacobson, M.Z. Turco, R.P. Jensen, E.J. Toon, O.B. 1994 “Modeling Coagulation among Particles of Different Composition and Size” Atmospheric Environment 28 1327 1338
- Kim, D-.H. Gautam, M. Gera, D. 2001 “On the Prediction of Concentration Variations in a Dispersing Heavy-Duty Truck Exhaust Plume Using k-ε Turbulent Closure” Atmospheric Environment , Vol. 35 ( 31 ), pp. 5267 75
- Kim, D 2002 On the Nucleation and Coagulation Modes in the Formation of Particulate Matter Inside an Exhaust Plume of a Diesel Vehicle West Virginia University, Department of Mechanical and Aerospace Engineering
- Kittleson, D.B. 1998 “Engines and Nanoparticles: a Review” Journal of Aerosol Science 29 575 588
- Mountain, R.D. Mulholland, G.W. Baum, H. 1986 “Simulation of aerosol agglomeration in the free molecular and continuum flow regimes” Journal of Collid and Interface Science 114 1 67 81
- Muller, H. 1928 “Zur Allgemeinen Theorie der Raschen Koagulation” Kolloidchemische Beihefte 27 223 50
- Pilinis, C. Seinfeld, J.H. 1987 “Continued development of a general equilibrium model for inorganic multicomponent atmospheric aerosols” Atmospheric environment 21 2453 2366
- Seinfeld, J.H. Pandis, S.N. 1997 Atmospheric Chemistry and Physics: From Air Pollution to Climate Change John Wiley & Sons, Inc. 605 Third Ave, New York, NY 10158
- Tambour, Y. Seinfeld, J.H. 1980 “Solution of the Discrete Coagulation Equation” Journal of Colloid Interface Science 74 260 272
- Tsang, T.H. Brock, J.R. 1983 “Simulation of condensation aerosol growth by condensation and evaporation” Aerosol Science and Technology 2 311 320
- Whitby, K.T. 1985 The modal Aerosol Dynamics Model, Part 1. Solution of the Internal Term of General Dynamic Equation of Aerosols Report to the U.S. EPA Department of Mechanical Engineering, University of Minnesota Minneapolis, MN
- Willeke, K. Baron, P. A. 1992 Aerosol Measurement: Principles Techniques and Applications Van Nostrand Reinhold 115 Fifth Avenue, New York, NY 10003
- Yom, K. Brock, J.R. 1984 Private Communication, Department of Chemical Engineering University of Texas Austin, TX