10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Effect of Pore Structures on Filtration Performance of Diesel Particulate Filters Based on 3-D Simulation
CHENG CHANG, Qisheng Ou, Yun Liang, David Y. H. Pui, University of Minnesota
Abstract Number: 935 Working Group: Control and Mitigation
Abstract Diesel particulate filters (DPFs) are widely used on diesel engines after-treatment system to mitigate the particulate matter emission. It was found experimentally that pore structures of DPF substrate greatly affected its pressure drop and filtration efficiency. Efforts have been made to correlate substrate pore structure and its filtration performance employing numerical simulations. A large number of numerical methods have been developed to simulate the filtration process, however, mainly based on modeled pore structures which could not sufficiently present the realistic structure of filter substrates. 3-D simulation of DPF performances is rarely reported. In this study, the pore size distribution and porosity of substrates were measured by both mercury porosimetry and X-ray micro-computed tomography (μ-CT). The filtration performance of DPFs was further predicted based on the 3-D micro-structure from μ-CT scans, which was compared with the experimental characterizations. Substrates with different pore structures were then established, from which the effect of porosity and pore size distribution on the particulate deposition in the substrates and filtration performance was further discussed. The results showed that there was a good agreement between the predicted values and experimental results. The most penetrating particle size varied with pore size distribution. In addition, the operational conditions, such as testing temperature and velocity, were found to significantly influence the filtration efficiency.