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A 2-D Diesel Particulate Filter Regeneration Model

A 2-D Diesel Particulate Filter Regeneration Model. Yu Zhang. Diesel particulate filter (DPF) collects diesel particulate (mainly soot) emissions. A soot layer is formed over a porous wall and removed by combustion (This soot layer removing process is referred as regeneration)

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A 2-D Diesel Particulate Filter Regeneration Model

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  1. A 2-D Diesel Particulate Filter Regeneration Model Yu Zhang

  2. Diesel particulate filter (DPF) collects diesel particulate (mainly soot) emissions. A soot layer is formed over a porous wall and removed by combustion (This soot layer removing process is referred as regeneration) A 2-D time-dependent model for the cross-section of a filter channel is formed to get a better understanding of the DPF regeneration process Introduction symmetry Inlet channel Soot layer Porous wall outlet channel symmetry

  3. Momentum Balances Navier-Stokes equation: ( in open channel) Brinkman equation: (soot layer and porous wall) Mass Balance Maxwell-Stefan diffusion and convection Energy Balance Governing Equations

  4. Governing Equations • Chemical reactions • Reaction rate • Heat source

  5. Model Formulation Plug Plug

  6. Solution • T distribution at 200s and 500s • P distribution at 0s and 500s

  7. Solution • Soot layer thickness distribution

  8. Validation • Exhaust back pressure comparison • Soot layer thickness distribution without considering chemical reactions Literature Calculated

  9. Parametric Study T=350K T=400K T=420K

  10. Conclusion • Soot layer thickness distribution is non-uniform due to the non-uniform temperature distribution along the filter channel • Soot layer thickness is sensitive to the exhaust temperature. As exhaust temperature increases, the soot layer thickness decreases significantly

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