Abstract
A numerical investigation on the soot laden flow of gas in a partial diesel particulate filter (PDPF) is presented based on solving the momentum equations for a continuous phase in the Euler frame and the motion equations for the dispersed phase in the Lagrangian frame. The interaction between the gas phase and the particles is considered as a one-way coupling for dilute particle concentration, while the interaction between particles and porous wall is implemented through user-definedsubroutines. To accurately track motion of nanoscale particles, the Brownian excitation and drag force as well as partial slip are taken into account in the particulate motion equation. Two methods are used to verify the gas flow model and reasonable agreements for both comparisons are observed. The effects of inlet velocity, wall permeability and particle size on the filtration efficiency and deposition distribution of the particles along with wall surface of inlet channel are quantitatively studied. The results show that (i) wall permeability plays the primary role in determining the filtration efficiency of PDPF, (ii) both upstream velocity and particle size have an effect on the initial deposition position of particles and (iii) filtration efficiency of PDPF is not markedly proportional to gas flow into inlet channels at a low wall permeability.
Highlights
As one of the most harmful components of exhaust gas from diesel engines during the last decades, particulate matter (PM) emission has aroused wide concern due to its potential effects on the atmospheric environment and human health [1,2,3,4]
This study presents a diesel particulate filters (DPFs) operated using a method of partial filtration named partial diesel particulate filter (PDPF)
A two-dimensional gas-particle two-phase flow model is applied to study the performance of PDPF
Summary
As one of the most harmful components of exhaust gas from diesel engines during the last decades, particulate matter (PM) emission has aroused wide concern due to its potential effects on the atmospheric environment and human health [1,2,3,4]. Based on years of practice, wall-flow diesel particulate filters (DPFs) have been considered as the most effective device to reduce PM emission from diesel engines to a required scope [5]. When exhaust gas from diesel engines flows through the porous wall from the inlet channel to the outlet channel, soot particles will be trapped inside or on the porous wall. As an incidental result of this structure and working mode, the exhaust back pressure will be increased inevitably with the continuous deposition of particles, worsening the power performance and economy of diesel engines. The process is known as the regeneration of DPF [7,8]
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