Growth and Restructuring Phenomena of Deposits in Particulate Filters

Paper #:
  • 2018-01-1265

Published:
  • 2018-04-03
Abstract:
As in-use experience with Diesel Particulate Filters (DPFs) is growing a need for better understanding of deposit structure, growth dynamics and their evolution arises. In the present paper we address a number of deposit growth and restructuring phenomena within DPFs with the aim to improve particulate filter soot load estimation, ash management and filter material selection/optimization. To this end we investigate the dynamic factors that quantify the amount of particles that are stored within the wall, the restructuring of soot induced by condensation of liquids and the role of ashes. We demonstrate that particle accumulation inside the porous wall is dynamically controlled by the dimensionless Peclet number and provide a procedure for its estimation. Restructuring phenomena affecting the flow resistance of the deposits are identified and a novel model of simulating a restructured deposit is developed and validated against experimental data. Overall the better understanding of such phenomena can lead to improved on-board model based control of emission control systems.
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