Abstract
Using five samples with different porous materials of Al2TiO5, SiC, and cordierite, we numerically realized the fluid dynamics in a diesel filter (diesel particulate filter, DPF). These inner structures were obtained by X-ray CT scanning to reproduce the flow field in the real product. The porosity as well as pore size was selected systematically. Inside the DPF, the complex flow pattern appears. The maximum filtration velocity is over ten times larger than the velocity at the inlet. When the flow forcibly needs to go through the consecutive small pores along the filter’s porous walls, the resultant pressure drop becomes large. The flow path length ratio to the filter wall thickness is almost the same for all samples, and its value is only 1.2. Then, the filter backpressure closely depends on the flow pattern inside the filter, which is due to the local substrate structure. In the modified filter substrate, by enlarging the pore and reducing the resistance for the net flow, the pressure drop is largely suppressed.
Highlights
A great amount of energy has been consumed in transport facilities, including trucks, buses, and passenger cars
In this study, using five samples with different porous materials of Al2 TiO5, SiC, and cordierite, we simulated the flow inside DPF
These inner structures were obtained by the X-ray CT scanning, in order to reproduce the real flow field in the porous filter
Summary
A great amount of energy has been consumed in transport facilities, including trucks, buses, and passenger cars. It is well admitted that diesel cars have contributed to a variety of industries and services to support our society. In comparison with gasoline engines, the advantage of diesel engines is that their fuel consumption rate is relatively lower. The disadvantage is that emissions of nitrogen oxide (NOx) and small particulates (particulate matters, PM) in diesel exhaust cause a serious public health problem, such as heart and lung disease, together with environmental pollution [1,2,3]. More stringent emission limit values for NOx and PM are needed. In Europe, new exhaust emissions standards, Euro 6d-TEMP, were set
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