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research-article

Flow and Pressure Variations through Porous Filter during Soot Filtration and Regeneration

[+] Author and Article Information
Kazuhiro Yamamoto

Dep. Mech. System Eng., Nagoya University, Chikusa, Furo, Nagoya, Aichi-ken 4648603, JP
kazuhiro@mech.nagoya-u.ac.jp

Ryo Komiyama

Dep. Mech. System Eng., Nagoya University, Chikusa, Furo, Nagoya, Aichi-ken 4648603, JP
komiyama@eess.mech.nagoya-u.ac.jp

Tatsuya Sakai

Dep. Mech. System Eng., Nagoya University, Chikusa, Furo, Nagoya, Aichi-ken 4648603, JP
sakai@eess.mech.nagoya-u.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4042152 History: Received August 17, 2018; Revised November 08, 2018

Abstract

To improve air pollution, we must reduce soot particulates in vehicle exhaust gas, which are inevitably harmful to the environment as well as to human health. Many countries are setting new regulations of nanoscale particle emission. Then, a ceramic porous filter such as DPFs (diesel particulate filters) has been developed. However, as more particles are trapped inside the filter, the filter backpressure corresponding to the pressure drop across the filter increases, which could worsen the fuel consumption rate, together with the abatement of the available torque. Usually, the filter regeneration process for particle oxidation inside the filter should be periodically needed. Thus, a filter with lower pressure drop would be preferable. In the current stage, the responses of the pressure drop during both particle filtration and oxidation are not fully understood. This is because these are the small-scale processes, and it is difficult to observe the phenomena experimentally. In this study, to consider the soot filtration, the exhaust gas flow with soot particles was simulated by a lattice Boltzmann method (LBM). Then, the time-variation of the pressure was discussed, which is important for the transport phenomena in the porous filter. For comparison, the pressure drop during the filter regeneration was also simulated to show the different pressure response affected by the soot oxidation zone.

Copyright (c) 2018 by ASME
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