Conferences, Lectures, & Seminars
Events for September
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Combustion Chemistry: Contributions From Theory
Wed, Sep 03, 2008 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Stephen J. KlippensteinChemical Sciences and Engineering DivisionArgonne National Laboratory Argonne, IL, 60439, USAA quantitative understanding of the chemistry of combustion is central to the improved performance of combustion devices. Advanced engine designs require an enhanced understanding of the ignition process. There is also continued interest in decreasing the production of pollutants such as NOx and soot particles. Chemical models of combustion employ rate coefficients for hundreds to thousands of reactions. The past 10 years have seen a major advance in the predictive capabilities of gas phase theoretical chemical kinetics. Thus, many of the rate coefficients in combustion models are now being obtained from theoretical studies. We will review our contributions to the kinetics of some key combustion reactions including studies of (i) NOx formation and removal, (ii) aromatic ring formation, (iii) fuel decomposition, and (iv) hydrocarbon oxidation. These studies will illustrate the recent progress in theoretical kinetics, while also emphasizing the synergy provided by detailed comparisons with experiment.
Location: Staufer Lecture Hall (SLH) 102
Audiences: Everyone Is Invited
Contact: April Mundy
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Development of Multilayer Thermoelectric Energy Harvesters
Wed, Sep 10, 2008 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Shih-Ming Yang, ProfessorDepartment of Aeronautics and AstronauticsNational Cheng Kung UniversityTaiwan, ROCABSTRACTA novel micro thermo-electric generator (μTEG) design is developed to harvest thermal gradient. Compared with conventional in-plan and cross-plan design, the μTEG is in hybrid configuration in which the heat flux from the top to bottom surface is confined passing through the in-plane P- and N-thermolegs. The thermolegs (thermal couples) of poly silicon are isolated by a cavity to prevent heat loss and maintain the temperature gradient thereby improving the output power. Analyses show that the μTEG performance can be further improved by stacking multilayered thermolegs and adapting low-dimensional thermoelectric materials. Design verification on a two-layered µTEG by TSMC 0.35μm 2P4M CMOS foundry process shows that the thermoleg design of 120 × 4 μm (length x width) has the highest power factor of 0.0427 µW/cm2 K2 and voltage factor of 3.417 V/cm2K2. The energy harvesters can be applied to autonomous sensor nodes.
Location: Staufer Lecture Hall (SLH) 102
Audiences: Everyone Is Invited
Contact: April Mundy
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New Metric for Regulation of Diesel Vehicle Emissions
Wed, Sep 24, 2008 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
New Metric for Regulation of Diesel Vehicle Emissions Heejung Jung Professor Dept. of Mechanical Engineering & CE-CERT
University of California
Riverside, CA 92507 As regulatory limits in California and the US for 2007 heavy-duty diesel engines introduce dramatic reductions in PM emissions, there is considerable interest in new emission metrology that can more accurately measure low PM levels. One such metrology, particle number measurement, has been extensively investigated in Europe as part of Europe's Particle Measurement Program (PMP) for light-duty diesel vehicles. This program has put forth a new methodology, including instrument specifications and sampling protocols, for "solid" particle number measurements. While counting only solid particles results in better precision, it may not be fully indicative of the diesel PM exhaust components of interest from a health effects perspective. The PMP protocol still represents a significant advancement as it is currently the only methodology with low enough detection limits to produce precise measurements of Diesel Particulate Filter (DPF) equipped engines. Evaluation study of the PMP methodology will be presented.Location: Stauffer Science Lecture Hall, Room 102 (SLH 102)
Audiences: Everyone Is Invited
Contact: April Mundy