25th - 27th March 2015

Berlin 2015  Rideal Conference

rideal2015.de

Sponsored by:


Prof. Andrea Strzelec
Department of Mechanical Engineering, Texas A&M University

Title:
Influences of Fuel Type on Characteristics of Exhaust Particulate

Abstract:
The influences of fuel type on the characteristics of exhaust particulates impacts their oxidation behavior and in turn the regeneration of a DPF or GPF. Gasoline direct injection (GDI) and diesel particulate samples from conventional and biofuel blends have been investigated and characterized with extent oxidation using two different oxidizers O2 and NO2. BET measurements revealed differences in the surface area evolution with fuel type and with oxidizer type. Particulate matter from the combustion of biofuel or biofuel blends initially have a greater surface area than particulates from conventional fuels. This measurement is confirmed by microscopy and fringe analysis of the nanostructure (lamella length, tortuosity and lamella spacing). As the samples are oxidized, each fuel/fuel-blend follows a different surface area trajectory, but all eventually approach the theoretical value for grapheme at 90% oxidation. Notably, under O2 oxidation, none of the particulate samples follow the shrinking core model prediction. However, under NO2 oxidation all of them do. HR-TEM analysis once again confirms this measurement as well as provides evidence of differences in burning mode: O2 oxidation of PM proceeds via the Zone-II, surface and pore, burning mode, whereas NO2 oxidation proceeds via a Zone-I surface burning mode. Discussion of the various experimental techniques and observations of a wide range of particulate types will be included.

Short Bio:
Andrea Strzelec, Ph.D. Assistant Professor, Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, TX 77843 Office: (979) 862-3367, e-mail: astrzelec@tamu.edu
Professional Preparaton:
University of Wisconsin-Madison Combustion Engineering, Ph.D. 2009
Appointments:
2011-Present Assistant Professor of Mechanical Engineering, Texas A&M University
2008-Present Member, Instrument Design Team, Versatile Neutron Imaging Instrument at the Spallation Neutron Source, Oak Ridge National Laboratory
2010-2011 Post Doctoral Research Associate, Energy & Materials Group, Pacific Northwest National Laboratory
2010-2011 Honorary Post Doctoral Fellow, Engineering Physics & Nuclear Engineering, University of Wisconsin
2009-2010 Post Doctoral Research Fellow, Fuels, Engines & Emissions Research Center, Oak Ridge National Laboratory
2006-2010 Post Masters Research Fellow, Fuels, Engines & Emissions Research Center, Oak Ridge National Laboratory
2004 Summer Research Assistant, Fuels, Engines & Emissions Research, Oak Ridge National Laboratory
2003-2006 Research Assistant, Engine Research Center, University of Wisconsin
2000-2002 Research Assistant, Chemical Engineering, University of Wisconsin
Research Areas:
Emissions Control: Chemical and physical characterization studies of emissions & catalysts.
Alternative Fuels
Filtration modeling.
Reaction kinetics & reaction engineering
Non-destructive Neutron Imaging