Grantee Research Project Results
2011 Progress Report: Quantifying the Effects of the Mixing Process in Fabricated Dilution Systems on Particulate Emission Measurements via an Integrated Experimental and Modeling Approach
EPA Grant Number: R834561Title: Quantifying the Effects of the Mixing Process in Fabricated Dilution Systems on Particulate Emission Measurements via an Integrated Experimental and Modeling Approach
Investigators: Zhang, Ke Max
Institution: Cornell University
EPA Project Officer: Chung, Serena
Project Period: May 1, 2010 through April 30, 2013 (Extended to October 30, 2013)
Project Period Covered by this Report: May 1, 2011 through April 30,2012
Project Amount: $250,000
RFA: Novel Approaches to Improving Air Pollution Emissions Information (2009) RFA Text | Recipients Lists
Research Category: Air Quality and Air Toxics , Air
Objective:
The main objective of this study is to investigate a key uncertainty in PM emissions measurement by examining the following questions: How do the mixing processes in the current constant volume sampler (CVS) systems differ from those in the real-world conditions? How do the mixing processes in the different CVS systems differ from each other? How does the mixing process interact with aerosol dynamics that affect PM measurements in the CVS systems and PM transformation in the atmosphere?
Progress Summary:
Figure 1. The geometries of the lab Tunnel and the field Tunnel
employed in Lipsky and Robinson (2005)
the two dilution tunnels. Blue represents the exhaust and red represents the dilution air, colors
betwen blue and red represents the degree of dilution.
Figure 4. TIme-averaged dilution rate of exhaust inside the dilution tunnels.
Future Activities:
We will simulate the evolutions of diesel exhaust plumes inside a full-scale wind tunnel, during on-road chasing, and in CVS emission measurement systems. The objective is to study how the mixing process in the CVS compares to that in the atmosphere, and how the difference affects PM emission measurement. In addition, we will model an ejector dilutor, which has been used in Portable Emission Measurement Systems (PEMS).
Journal Articles on this Report : 2 Displayed | Download in RIS Format
Other project views: | All 5 publications | 2 publications in selected types | All 2 journal articles |
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Type | Citation | ||
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Wang YJ, Zhang KM. Coupled turbulence and aerosol dynamics modeling of vehicle exhaust plumes using the CTAG model. Atmospheric Environment 2012;59:284-293. |
R834561 (2011) R834561 (2012) R834561 (Final) |
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Wang YJ, Yang B, Lipsky EM, Robinson AL, Zhang KM. Analyses of turbulent flow fields and aerosol dynamics of diesel engine exhaust inside two dilution sampling tunnels using the CTAG model. Environmental Science & Technology 2013;47(2):889-898. |
R834561 (2011) R834561 (2012) R834561 (Final) R834554 (Final) |
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Supplemental Keywords:
PM2.5, combustion, on-road, non-road, stationary sources, ultrafine, public health, human exposure, climate changeRelevant Websites:
Energy and the Environment Exit
Progress and Final Reports:
Original AbstractThe perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.