期刊
CHEMICAL ENGINEERING JOURNAL
卷 338, 期 -, 页码 15-26出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.01.006
关键词
Gasoline particulate filter; Particle filtration; Numerical simulation; Substrate microstructure; Particle number; Particle mass
资金
- General Motors Research and Development
- GM-UW collaborative research laboratory (CRL) program
- US Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technology Office
The state-of-the-art multiscale modeling of gasoline particulate filter (GPF) including channel scale, wall scale, and pore scale is described. The microstructures of two GPFs were experimentally characterized. The pore size distributions of the GPFs were determined by mercury porosimetry. The porosity was measured by X-ray computed tomography (CT) and found to be inhomogeneous across the substrate wall. The significance of pore size distribution with respect to filtration performance was analyzed. The predictions of filtration efficiency were improved by including the pore size distribution in the filtration model. A dynamic heterogeneous multiscale filtration (HMF) model was utilized to simulate particulate filtration on a single channel particulate filter with realistic particulate emissions from a spark-ignition direct-injection (SIDI) gasoline engine. The dynamic evolution of filter's microstructure and macroscopic filtration characteristics including mass-and number-based filtration efficiencies and pressure drop were predicted and discussed. The microstructure of the GPF substrate including inhomogeneous porosity and pore size distribution is found to significantly influence local particulate deposition inside the substrate and macroscopic filtration performance and is recommended to be resolved in the filtration model to simulate and evaluate the filtration performance of GPFs.
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