Multichannel Simulation of Soot Oxidation in Diesel Particulate Filters

Catalyzed diesel particulate filter modeling

“…Bissett originally neglected radiative heat transport, but Konstandopoulos et al (2001) incorporate it in their original multidimensional formulation for completeness. However, in this article, they mention that this term is insignificant for typical regeneration applications and it does not appear in their later continuum-based modeling articles (Konstandopoulos et al 2003a ). A few years later, Haralampous et al state that, during regeneration, high temperatures can develop as well as significant axial temperature gradients (Haralampous et al 2003.…”

“…For the outlet channel equations, the density and velo city of the gas in the wall layer used in the flux term are also evaluated at the interface: Although the areaconserved formulation is not necessary for the outlet channel, writing the equations in this manner allows for different geometries to be used similar to work previously accomplished by Konstandopoulos et al (2003bKonstandopoulos et al ( , 2005 . The area-conserved format more accurately tracks mass conservation in situations of varying geometry and matches the experimental data better in situations of medium to heavy loading events as shown in Figure 10 .…”

“…Because the focus of this article is modeling involving the classic Bissett versions, the authors do not include a description of other multidimensional models in the literature that do not follow the Bissett energy equation approach (Aoki Konstandopoulos et al (2001) , who simplify a multidimensional DPF model by using a continuum description of the filter (Gropi and Tronconi 1996 ). This formulation involves implementing an effective thermal conductivity tensor (Haralampous et al 2003, Konstandopoulos et al 2003a, Kostoglou et al 2003:…”

Update on the Science and Technology of Diesel Particulate Filters

“…Direct demonstration of soot-catalyst contact effects on diesel soot oxidation in filters has been published in 67) . A mathematical description of the incomplete sootcatalyst contact, the so-called "Two-Layer Model" was introduced a decade ago, and it has been since incorporated into state-of-the-art DPF simulators 68,69,70,71) .…”

“…The virtual sensor is programmed to take this into account by containing information on the flow resistance of ashloaded filter materials 38) . Using such tests in conjunction with a state-of-theart real-time DPF simulator 70,71) , it is possible to calibrate and to fully integrate model-based regeneration strategies with the soot virtual sensor module (see 86 for an early description of such strategies). Our current implementation relies on maintaining a target soot mass load in the DPF by injecting a quantity of fuel upstream of the DOC at appropriate instants.…”