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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Derivation and Solution of the General Dynamic Equation for Fine Particulate Matter Emitted from Internal Combustion Engines

Get access (open in a dialog) DOI: 10.1615/IHTC12.4450
6 pages

Résumé

The main objective of this work is to develop a theoretical model for the interpretation of remote sensing measurements of particles concentrations emitted by motor vehicles. Particles growth and turbulent diffusion are discussed in this paper. These processes, together with convection and sedimentation, determine the size distribution function of the particles, N. AGe neral Dynamic Equation (GDE) has been derived for steady state, which governs the dependence on space of N. The GDE is modified for the number concentration of the particles, M, by using the functional relationship between N and M, involving the Gamma distribution function. This equation has a known analytical solution. Theoretical results of the solutions to the GDE equation (for M) and the diffusion coefficient are presented. The results show that fine particles are dispersed in a narrow zone inside the plume of the exhaust gases. This is because the diffusion coefficient becomes smaller as the particle diameter increases, and the exhaust gas temperature decreases.