This paper presents an original three dimensional model for fluid flow and soot deposition in the overall wall flow honeycomb DPF. First, hot-wire experimental velocity measurements carried out along the DPF outlet cross-section are shown to highlight the flow heterogeneity. Then coupled 1D local momentum and mass balance equations to describe a bundle of channels are proposed and discussed. The model is applied to simulate the loading of a bundle of channels. Two typical cases are considered to illustrate heterogeneity problems: (i) a transverse wall permeability gradient and (ii) the initial blockage of two entrance channels. In this latter case, the heterogeneity effect is found to be confined in the neighbor channels. Finally, a macroscopic form of this set of 1D local equations, obtained using a method of volume averaging applied on a cross-section filter element which consists of several unit elements, is described. First simulations of loading of a square cross-section DPF, having an initial spatial distribution of wall permeability, are performed. Results clearly show the heterogeneity distribution of both the flow and soot deposition through the DPF.


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    Title :

    3D Macroscopic Model for Fluid Flow and Soot Deposit in Wall Flow Honeycomb DPF


    Additional title:

    Sae Technical Papers


    Contributors:
    Oxarango, L. (author) / Quintard, M. (author) / Schmitz, P. (author) / Bardon, S. (author)

    Conference:

    SAE 2003 World Congress & Exhibition ; 2003



    Publication date :

    2003-03-03




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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