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Skip to Search Results- 1Ahsan, Hamza
- 1Chen, Kerry
- 1Dickau, Matthew A
- 1Falahati, Farjad
- 1Ferraz Albani, Luis A
- 1Graves, Brian M
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Characterization of Particulate Matter Morphology and Volatility for Two Direct-Injection Engines
DownloadFall 2015
Particulate matter emitted from two direct injection engines has been characterized by morphology, volatility, mass-mobility exponent, effective density, and size distribution using tandem measurements from a centrifugal particle mass analyzer (CPMA) and differential mobility analyzers (DMA). The...
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Development and Applications of an Emissions Micro-Simulation Tool for Transportation Infrastructure Design
DownloadFall 2014
Transportation emissions constitute a significant portion of overall emissions inventories, and contribute to air quality health concerns. Reductions in transportation emissions can be achieved through efficient design of infrastructure, effective policy and regulation, and informed planning...
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Spring 2019
A general-purpose aerosol conditioning device called the Universal Aerosol Conditioner has been designed and tested. The device can condition the aerosol in multiple ways. It can dilute the aerosol with particle-free air, dilute only the gas-phase component of the aerosol without diluting the...
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Estimation of the Evaporation Rate of an Isolated Water Microdroplet Subjected to Infrared Radiative Heating
DownloadFall 2014
A combined numerical-experimental investigation was performed to study the influence of infrared radiation on the evaporation of a single-component droplet in the range between 10 and 50 micrometers, under different environmental conditions of relative humidity and temperature of air. A numerical...
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Experimental Investigation of the Effect of NaCl Additive on the Formation and Evolution of Particles in a Diffusion Flame
DownloadSpring 2017
Formation and evolution of nano-particles in a laminar co-flow methane diffusion flame were investigated under two conditions: a pure methane flame and a methane flame doped with NaCl particles. Samples of nano-particles from different heights above the burner were extracted by a probe sampling...
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Experimental study of methane decarbonization to produce hydrogen using a laminar premixed flame
DownloadSpring 2018
Hydrogen is a promising source of energy with various applications. The most common method of producing hydrogen is steam reforming of methane; however, thermal cracking of methane can be used alternatively for hydrogen production with less CO2 emissions. In this study, thermal cracking of...
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Experimental Study on the Carbon Conversion Efficiency and Emission Indices of a Lab-Scale Air-Assisted Flare
DownloadSpring 2019
A lab-scale coflow burner was used to investigate the effect of air assist on the carbon conversion efficiency (CCE) and emission indices (EIs) of industrial flare operations in the upstream and downstream energy sectors of the oil and gas industry. A 25.4 mm diameter burner was constructed of...
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Improving Measurements of the Mixing State and Mass Concentration of Particulate Emissions from Aircraft Engines
DownloadSpring 2016
This research is focused towards improving techniques used to measure particulate emissions from aircraft engines, on two fronts: first, to characterize and quantify the mixing state of particulate emissions; and second, to calibrate black carbon mass instruments with a traceable mass...
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Mass-Mobility Measurements of Aircraft Particulate Matter Using a Novel Measurement Method: A Centrifugal Particle Mass Analyzer and Differential Mobility Spectrometer System
DownloadFall 2013
Mass-mobility measurements using a centrifugal particle mass analyzer (CPMA) and differential mobility spectrometer (DMS) are demonstrated. The CPMA, which classifies an aerosol by mass-to-charge ratio, is used upstream of a DMS, which measures the mobility size distribution of the...
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Measurements of Methane Pyrolysis in a Constant Volume Batch Reactor at High Temperatures and Pressures
DownloadFall 2021
Methane pyrolysis is a process used to generate hydrogen gas and carbon black without the creation of carbon dioxide. Methane pyrolysis in a constant volume batch reactor was investigated at temperatures of 892 K, 1093 K, and 1292 K with reaction times of 15 s, 30 s, 60 s, 180 s, and 300 s with...