Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

OP-II-9(a) Particle size 100nm (b)Fig. 1. (a) Profiles of axial velocity at different axial positions in the channel for gas (solid line) and sootparticles (dots). (b) Through-wall gas velocity for different amounts of collected soot.was substituted by a series of mono-dispersed particle distributions, whose size and volumefraction was calculated by means of the so-called direct quadrature method of moments [3].The cake resistance coefficient is generally higher than that of the filter, thus entailingthat the soot cake immediately becomes the only considerable resistance, and the sootthrough-wall velocity profile evolves towards an «iso-permeability» constant profile (Fig. 1-b), characterized by a constant thickness of the soot layer. However, the ever-changingdriving conditions generate a variable cake thickness along the axial coordinate, whichinfluence the dynamics of the regeneration process, modelled by inclusion in the code of sootcombustion kinetics determined experimentally.A wide range of operating conditions are considered in this work, for which a largeamount of experimental data within our research group are available for comparison andvalidation. The developed model represents a unique design tool for diesel particulate trapswith minimum space occupancy and maximum filtration efficiency and is being exploited ona specific contract with a major car manufacturer.AcknowledgementsThe European Community financial support for the ATLANTIS project is gratefullyacknowledged.References1. L. Schiller & Z. Naumann. Z. Ver. Deutsch. Ing., 77 (1935) 318.2. A. Konstandopoulos et al., SAE Paper 2000-01-1016, (2000) 593.3. D.L. Marchisio & R. Fox, Journal of Aerosol Science, 36 (2005) 43.91