Abstract
Nowadays, in the after-treatment of diesel exhaust gas, a diesel particulate filter (DPF) has been used to trap nano-particles of the diesel soot. However, as there are more particles inside the filter, the pressure which corresponds to the filter backpressure increases, which worsens the fuel consumption rate, together with the abatement of the available torque. Thus, a filter with lower backpressure would be needed. To achieve this, it is necessary to utilize the information on the phenomena including both the soot transport and its removal inside the DPF, and optimize the filter substrate structure. In this paper, to obtain useful information for optimization of the filter structure, we tested seven filters with different porosities and pore sizes. The porosity and pore size were changed systematically. To consider the soot filtration, the particle-laden flow was simulated by a lattice Boltzmann method (LBM). Then, the flow field and the pressure change were discussed during the filtration process.
Highlights
It is well known that the combustion generated soot is harmful to our human health, because it is certain toxic and has carcinogenic effect [1,2]
The diesel soot in exhaust gas mainly consists of solid particles, which are generally called particulate matter (PM)
It is necessary to utilize the information on the phenomena including both the soot transport and its removal inside the diesel particulate filter (DPF), in compliance with the optimal operating conditions
Summary
It is well known that the combustion generated soot is harmful to our human health, because it is certain toxic and has carcinogenic effect [1,2]. The diesel soot in exhaust gas mainly consists of solid particles, which are generally called particulate matter (PM). The soot appears due to incomplete combustion in the diesel engine. Most of soot particles exist both in the ranges of. The smaller particles can be transported to the deeper region of our lung tissues densely packed with alveoli [3]. It would contribute to environmental degradation and global warming. In many countries including Japan, the stricter regulations on the emission of PM have been set, such as the so-called Euro VI in recent emission standards
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