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Search Publications by: William Sean McGivern (Fed)

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Displaying 1 - 25 of 34

Binary Diffusion Coefficients for Fluorocarbons in Nitrogen

July 20, 2021
Author(s)
William Sean McGivern, Jeffrey A. Manion
Binary gas-phase diffusion coefficients, of interest in physical models of atmospheric and combustion chemistry, have been measured in N2 for the homologous series of refrigerant-related (fluoro)methanes CH4, CH3F, CH2F2, and CHF3. Values have been

Diaphragmless Single Pulse Shock Tube for High-Temperature Chemical Kinetics Studies

June 3, 2019
Author(s)
William Sean McGivern, Iftikhar A. Awan, Jeffrey A. Manion
Single pulse shock tubes are effective tools for measuring chemical kinetics at high temperatures, typically (900–1400) K. However, the use of a diaphragm for shock generation leads to significant shock-to- shock inconsistencies in temperature for a

Theory and Experiment of Binary Diffusion Coefficient of n-Alkanes in Dilute Gases

September 27, 2016
Author(s)
Changran Liu, William S. McGivern, Jeffrey A. Manion, Hai Wang
Binary diffusion coefficients were measured for n-pentane, n-hexane and n-octane in helium and of n-pentane in nitrogen over the temperature range of (300 - 600) K, using reversed-flow gas chromatography. A generalized, analytical theory was proposed for

Quantitative Evidence for Organic Peroxy Radical Photochemistry

December 12, 2014
Author(s)
William S. McGivern, Joseph Klems
Quantitative evidence for the importance of alkyl peroxy photochemistry in the formation of secondary organic aerosol at 254 nm. Dodecanoic acid has been oxidized extensively in a flow cell by photolytically generated hydroxyl radicals to create particles

Alkylperoxy Radical Photochemistry in Organic Aerosol Formation Processes

December 9, 2013
Author(s)
Alicia Kalafut-Pettibone, Joseph Klems, Donald R. Burgess Jr., William S. McGivern
Recent studies have shown that 254 nm light can be used to generate organic aerosol from iodoalkane/air mixtures via photodissociation of the C−I bond and subsequent oxidation of the single radical isomer. We examine organic aerosol formed from 1

Reversed-Flow Chromatographic Determination of Binary Diffusion Coefficients

September 19, 2011
Author(s)
William S. McGivern, Jeffrey A. Manion
A reversed-flow chromatographic apparatus for the measurement of binary diffusion coefficients is described. Hydrocarbons are detected using flame ionization detection, and inert species can be detected by thermal conductivity. We have measured the binary

The Decomposition and Isomerization of 5-Methylhex-1-yl Radical

July 9, 2010
Author(s)
Iftikhar A. Awan, William S. McGivern, Wing Tsang, Jeffrey A. Manion
The decomposition and isomerization reactions of the 5-methylhex-1-yl radical (1-5MeH) have been studied at temperatures of 889 K to 1064 K and pressures of 1.6 bar to 2.2 bar using the single pulse shock tube technique. The radical of interest was

Soot Precursors from Real Fuels: The Unimolecular Reactions of Fuel Radicals

October 16, 2008
Author(s)
Wing Tsang, Iftikhar A. Awan, William Sean McGivern, Jeffrey A. Manion
This paper describes studies aimed at defining in a quantitative fashion the cracking pattern of fuel radicals under combustion conditions. The experimental procedure involves studies using a single pulse shock tube and combining the observations with