UScholar Works
 
Filters: Department: "Chemical Engineering" Collection: "ir_uspace"
26 - 50 of 62
Number of results to display per page
CreatorTitleDescriptionSubjectDate
26 Sarofim, Adel F.; Truong, ThanhKinetics of hydrogen abstraction reactions from polycyclic aromatic hydrocarbons by H atomsAn application of the Reaction Class Transition State Theory/Linear Energy Relationship (RC-TST/LER) is presented for the evaluation of the thermal rate constants of hydrogen abstraction reactions by H atoms from Polycyclic Aromatic Hydrocarbons (PAH). Two classes of reactions have been considered, ...Reaction Class Transition State Theory; Linear Energy Relationship; Hydrogen abstraction reactions2004
27 Eddings, Eric G.; Sarofim, Adel F.Thermal behavior of a high-energy material immersed in a fireOne of the uncertainties in the calculations of time-to-explosion for containers of high-energy materials immersed in fires is that of the thermal boundary at the container-explosive interface. Understanding this interface is critical in evaluating risks, safety issues and prevention mechanisms. In ...2004
28 Lighty, Joann; Sarofim, Adel F.; Eddings, Eric G.Modeling the coagulation of charged particlesOne important mechanism in the growth of soot particles is to understand the role of particle charge in the coagulation of the particles. A previously developed model has been extended to include the coagulation of charged particles. The model includes neutral particles and charged particles (up to ...Charged particles; Flame ionization; Modeling2004
29 Eddings, Eric G.; Spinti, Jennifer C.; Smith, Philip J.Soot volume fraction from extinction in JP-8 and heptane pool firesTotal extinction measurements from a multiple beam experiment using a 10mW laser diode are presented and compared to calculate soot volume fraction in heavily sooting pool fires from a 150 mm diameter pan of Jet Propulsion fuel 8 (JP-8) and heptane. Trends in attenuation are critiqued for the t...Pool fires; Jet propulsion fuel2005
30 Eddings, Eric G.; Smith, Philip J.Soot volume fraction from extinction in JP-8 and heptane pool firesTotal extinction measurements from a multiple beam experiment using a 10mW laser diode are presented and compared to calculate soot volume fraction in heavily sooting pool fires from a 150 mm diameter pan of Jet Propulsion fuel 8 (JP-8) and heptane. Trends in attenuation are critiqued for the t...Soot volume fraction; Heptane pool fires; JP-8 pool fires; Heavily sooting pool fires; Laser diagnostics2005
31 Eddings, Eric G.; Sarofim, Adel F.Modeling benzene and naphthalene formation in a premixed propylene flameThe Utah Surrogate Mechanism was used to model a fuel-rich, non-sooting premixed laminar flame of propylene at 5000 Pa with an equivalence ratio of 2.32. The simulation results were found to be satisfactory in comparison with the experimental data. For example, the measured concentration profiles of...Utah Surrogate Mechanism; Propylene; Combustion modeling; Benzene formation; Naphthalene formation2005
32 Smith, Philip J.Soot in combustion simulationsSoot is the dominant source of radiative heat transfer from most practical flames. A review is presented of historical, empirical modelling approaches for estimating heat flux from fires and flames. These historical methods have drawn on empiricism to address the role of soot while seeking methods f...Large eddy simulation; LES; Combustion simulation; Radiative heat transfer; Pool fires2005
33 Sarofim, Adel F.; Eddings, Eric G.Muiltifunctional fuel additives for reduced jet particlate emissionsUsing Government drawings, specifications, or other data included in this document for any purpose other than Government procurement does not in any way obligate the U.S. Government. The fact that the Government formulated or supplied the drawings, specifications, or other data does not license the ...2006
34 Lighty, Joann; Silcox, GeoffreyFundamentals of mercury oxidation in flue gasThis report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, ...2006
35 Ring, Terry Arthur; Eddings, Eric G.; Sarofim, Adel F.Determination of soot refractive index as a function of height in an inverse diffusion flameWith the scope of combustion diagnostics increasing, it is becoming ever more important for some of the more basic physical properties of soot to be addressed. Soot refractive index values were obtained as a function of height in a benzene inverse diffusion flame (IDF). The IDF was chosen for ease i...Inverse diffusion flame2007
36 Eddings, Eric G.; Sarofim, Adel F.Olefin chemistry in a premixed n-heptane flameThree different n-heptane mechanisms were used to simulate a fuel-rich normal heptane premixed flame in order to identify major reaction pathways for olefin formation and consumption and areas of uncertainties of these reactions. Olefins are formed mainly via ?-scission and hydrogen abstraction, and...Heptane mechanism; N-heptane; Olefin formation; Olefin consumption; Alkyl radicals2007
37 Eddings, Eric G.; Sarofim, Adel F.Mechanism reduction and generation using analysis of major fuel consumption pathways for n-heptane in premixed and diffusion flamesReaction pathway analyses were conducted for three mechanisms (designated as the Pitsch, Utah, and Lawrence Livermore National Lab) for a normal heptane premixed flame (? = 1.9) and a normal heptane opposed diffusion flame, in order to identify the relative importance of the major fuel consumption p...Pitsch mechanism; Utah mechanism; Lawrence Livermore National Lab mechanism; Mechanism reduction; Heptane premixed flame2007
38 Eddings, Eric G.; Sarofim, Adel F.; Pugmire, Ronald J.Selection of surrogates for jet fuelsAbstract: A. detailed characterisation of JP fuels is provided based on literature data for the average of 55 worldwide and 4 US Jet-A fuels. These are complemented by NMR analysis of a JP-8 that provides the fractions of the carbon in the fuel that are present as protonated, bridgehead, and non-sub...Jet propulsion fuel; Surrogates; Simulations2008
39 Eddings, Eric G.; Sarofim, Adel F.Journey from n-heptane to liquid transportation fuels. 1. The role of the allylic radicals and its related species in aromatic precursor chemistryThe Utah normal heptane mechanism compiled from submechanisms in the literature was extended into a detailed normal decane combustion mechanism, which is a subset of the Utah surrogate mechanisms. Few species have greater impact on the concentrations of other species than the allyl radical CH2CHCH2....Utah Surrogate Mechanisms; Heptane mechanism; Decane combustion mechanism; Allyl radical; Aromatic precursors2008
40 Eddings, Eric G.; Sarofim, Adel F.Pollutant emissions from gasoline combustion. 1. Dependence on fuel structural functionalitiesTo study the formation of air pollutants and soot precursors (e.g., acetylene, 1,3-butadiene, benzene, and higher aromatics) from aliphatic and aromatic fractions of gasoline fuels, the Utah Surrogate Mechanisms is extended to include submechanisms of gasoline surrogate compounds using a set of mech...Pollutant emissions; Soot precursors; Gasoline surrogate compounds; Utah Surrogate Mechanisms2008
41 Sutherland, James Clayton; Kerstein, Alan R.; Chen, Jaqueline H.An evaluation of the one-dimensional turbulence model: comparison with direct numerical simulation of CO/H2 jets with extinction and reignitionAbstract A variant of the One-Dimensional Turbulence (ODT) model formulated in an Eulerian reference frame is applied to a planar nonpre mixed turbulent jet flame and results from the model prediction are compared with DNS data. The model employed herein solves the full set of conservation equation...2010
42 Sutherland, James Clayton; Kerstein, Alan R.A unified approach to the various formulations of the one-dimensional-turbulence modelThe One-Dimensional Turbulence (ODT) model has been successfully applied as a stand-alone model for predicting turbulence statistics in both nonreacting and reacting flows. There are several formulations of the model in the literature, and most of the variable-density formulations do not clearly dis...2010
43 Whitty, Kevin J.A system for measuring bubble voidage and frequency around tubes immersed in a fluidized bed of particlesGas-solid fluidized beds are common in chemical processing and energy production industries. These types of reactors frequently have banks of tubes immersed within the bed to provide heating or cooling, and it is important that the fluid dynamics within these bundles is efficient and uniform. This p...2010
44 Ring, Terry ArthurVerification of analytic energy moments for the one-dimensional energy dependent neutron diffusion equation with MCNP5 and Attila-7.1.0The energy dependent neutron diffusion equation (EDNDE) is converted into a moment equation which is solved analytically for the 1-D problem of a bare sphere of pure 235U. The normalized moments 0-5 generated analytically are compared to normalized energy moments, from Monte Carlo N Particle 5 versi...2012-01-01
45 Ring, Terry ArthurValidation of energy moments from the one-dimensional energy dependent neutron diffusion equation, MCNP5 and Attila-7.1.0 with the GODIVA experimentNormalized neutron energy moments (moments) from the one-dimensional energy dependent neutron diffusion equation (EDNDE), Monte Carlo N Particle 5 version 1.40 (MCNP5) and Attila-7.1.0-beta version (Attila) are validated with the GODIVA experiment (GODIVA). Energy moments 0-5 for all three methods a...2012-01-01
46 Whitty, Kevin J.A pulse-width modulation controlled wire-mesh heater apparatus for investigation of solid fuel pyrolysisA novel wire mesh heater apparatus has been developed to study the devolatilization of solid fuels under pressurized conditions at well-controlled heating rates on the order of 1000 K/s. The apparatus combines direct current and pulse-width modulation with a fast-acting and high current-capacity re...2012-01-01
47 Sutherland, James ClaytonA filter-independent model identification technique for turbulent combustion modelingIn this paper, we address a method to reduce the number of species equations that must be solved via application of Principal Component Analysis (PCA). This technique provides a robust methodology to reduce the number of species equations by identifying correlations in state-space and defining new v...2012-01-01
48 Lighty, JoannThe role of open innovation in development of futuristic technologies for carbon capture in coal-fired power plants: an academic perspectiveCoal is an important fossil fuel resource for electricity generation which also contributes to significant CO2 emissions. The process of capturing carbon dioxide for utilization and sequestration is an important area of research in this domain. Academia-industry collaborations are playing a signific...2012-01-01
49 Ring, Terry ArthurRoom temperature co-precipitation synthesis of magnetite nanoparticles in a large pH window with different basesMagnetite nanoparticles (Fe3O4) represent the most promising materials in medical applications. To favor high-drug or enzyme loading on the nanoparticles, they are incorporated into mesoporous materials to form a hybrid support with the consequent reduction of magnetization saturation. The direct sy...2013-01-01
50 Ring, Terry ArthurGrowth kinetics of hexagonal sub-micrometric β-tricalcium phosphate particles in ethylene glycolRecently, uniform, non-agglomerated, hexagonal b-tricalcium phosphate (b-TCP) platelets (diameter 400-1700 nm, h 100-200 nm) were obtained at fairly moderate temperatures (90-170 C) by precipitation in ethylene glycol. Unfortunately, the platelet aspect ratios (diameter/thickness) obtained in the ...2014-01-01
26 - 50 of 62