Detailed Characterization of Morphology and Dimensions of Diesel Particulates Via Thermophoretic Sampling

Document Number: 2001-01-3572

Date Published: September 2001

Author(s):
Kyeong Ook Lee - Argonne National Laboratory
Roger Cole - Argonne National Laboratory
Raj Sekar - Argonne National Laboratory
Mun Young Choi - Drexel Univ.
Jinyu Zhu - Univ. of Illinois at Chicago
Jinsuk Kang - Korea Advanced Inst of Science & Tech
Choongsik Bae - Korea Advanced Inst of Science & Tech

Abstract:
A thermophoretic particulate sampling device was used to investigate the detailed morphology and microstructure of diesel particulates at various engine- operating conditions. A 75 HP Caterpillar single-cylinder direct-injection diesel engine was operated to sample particulate matter from the high- temperature exhaust stream. The morphology and microstructure of the collected diesel particulates were analyzed using a high-resolution transmission electron microscope and subsequent image processing/data acquisition system. The analysis revealed that spherical primary particles were agglomerated together to form large aggregate clusters for most of engine speed and load conditions. Measured primary particle sizes ranged from 34.4 to 28.5 nm at various engine- operating conditions. The smaller primary particles observed at high engine- operating conditions were believed to be caused by particle oxidation at the high combustion temperature. A number of small and irregularly shaped particles were captured at these conditions. Graphitic structures were observed for the soot sampled at the high engine-operating conditions, while other samples from the lower engine-operating conditions displayed mostly amorphous structures. Analyses for fractal geometry of soot agglomerates suggested that the diffusion- limited particulate growth mechanism, by which chain-like particle clusters form, is predominant.

File Size: 345K
Product Status: In Stock

See other papers presented at SAE International Fall Fuels & Lubricants Meeting & Exhibition, September 2001, San Antonio, TX, USA, Session: Particulate Emissions Measurement and Control for Internal Combustion Engines (Part A&B)

Spring Fuels & Lubricants Meeting & Exhibition, May 2002, Reno, NV, USA, Session: Particulate Emissions (Part A&B)

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