Evolution of deep-bed filtration of engine exhaust particulates with trapped mass

Journal Article · Thu Nov 03 04:00:00 EDT 2016 · International Journal of Engine Research

DOI:https://doi.org/10.1177/1468087416675094· OSTI ID:1393753

Viswanathan, Sandeep; Rothamer, David A.; Foster, David E.; Fansler, Todd D.; Zelenyuk, Alla; Stewart, Mark L.; Bell, David M.

Micro-scale filtration experiments were performed on cordierite filter samples using particulate matter (PM) generated by a spark-ignition direct-injection (SIDI) engine fueled with tier II EEE certification gasoline. Size-resolved mass and number concentrations were obtained from several engine operating conditions. The resultant mass-mobility relationships showed weak dependence on the operating condition. An integrated particle size distribution (IPSD) method was used estimate the PM mass concentration in the exhaust stream from the SIDI engine and a heavy duty diesel (HDD) engine. The average estimated mass concentration between all conditions was ~77****** % of the gravimetric measurements performed on Teflon filters. Despite the relatively low elemental carbon fraction (~0.4 to 0.7), the IPSD mass for stoichiometric SIDI exhaust was ~83±38 % of the gravimetric measurement. Identical cordierite filter samples with properties representative of diesel particulate filters were sequentially loaded with PM from the different SIDI engine operating conditions, in order of increasing PM mass concentration. Simultaneous particle size distribution measurements upstream and downstream of the filter sample were used to evaluate filter performance evolution and the instantaneous trapped mass within the filter for two different filter face velocities. The evolution of filtration performance for the different samples was sensitive only to trapped mass, despite using PM from a wide range of operating conditions. Higher filtration velocity resulted in a more rapid shift in the most penetrating particle size towards smaller mobility diameters.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1393753
• Report Number(s): PNNL-SA-114783; 47936; KC0302020; VT0401000
• Journal Information: International Journal of Engine Research, Journal Name: International Journal of Engine Research Journal Issue: 5-6 Vol. 18; ISSN 1468-0874
• Publisher: SAGE
• Country of Publication: United States
• Language: English

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Environmental Molecular Sciences Laboratory