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A Detailed Modeling Study of Propane Oxidation

Description: A detailed chemical kinetic mechanism has been used to simulate ignition delay times recorded by a number of experimental shock tube studies over the temperature range 900 {le} T {le} 1800 K, in the pressure range 0.75-40 atm and in the equivalence ratio range 0.5 {le} {phi} {le} 2.0. Flame speed measurements at 1 atm in the equivalence ratio range 0.4 {le} {phi} {le} 1.8 have also been simulated. Both of these data sets, particularly those recorded at high pressure, are of particular importanc… more
Date: March 19, 2004
Creator: Westbrook, C. K.; Jayaweera, T. M.; Pitz, W. J. & Curran, H. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Vacuum Technology

Description: The environmental condition called vacuum is created any time the pressure of a gas is reduced compared to atmospheric pressure. On earth we typically create a vacuum by connecting a pump capable of moving gas to a relatively leak free vessel. Through operation of the gas pump the number of gas molecules per unit volume is decreased within the vessel. As soon as one creates a vacuum natural forces (in this case entropy) work to restore equilibrium pressure; the practical effect of this is that … more
Date: October 15, 2004
Creator: Biltoft, P. J.
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
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Critical Heat Flux in Inclined Rectangular Narrow Gaps

Description: In light of the TMI-2 accident, in which the reactor vessel lower head survived the attack by molten core material, the in-vessel retention strategy was suggested to benefit from cooling the debris through a gap between the lower head and the core material. The GAMMA 1D (Gap Apparatus Mitigating Melt Attack One Dimensional) tests were conducted to investigate the critical heat flux (CHF) in narrow gaps with varying surface orientations. The CHF in an inclined gap, especially in case of the down… more
Date: June 1, 2004
Creator: Kim, Jeong J.; Kim, Yong H.; Kim, Seong J.; Noh, Sang W.; Suh, Kune Y.; Rempe, Joy L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Year 2 Biomass Utilization: Final Technical Report

Description: This Energy & Environmental Research Center (EERC) Year 2 Biomass Utilization Final Technical Report summarizes multiple projects in biopower or bioenergy, transportation biofuels, and bioproducts. A prototype of a novel advanced power system, termed the high-temperature air furnace (HITAF), was tested for performance while converting biomass and coal blends to energy. Three biomass fuels--wood residue or hog fuel, corn stover, and switchgrass--and Wyoming subbituminous coal were acquired for c… more
Date: November 1, 2004
Creator: Zygarlicke, Christopher J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermodynamics of Hydrogen Production from Dimethyl Ether Steam Reforming and Hydrolysis

Description: The thermodynamic analyses of producing a hydrogen-rich fuel-cell feed from the process of dimethyl ether (DME) steam reforming were investigated as a function of steam-to-carbon ratio (0-4), temperature (100 C-600 C), pressure (1-5 atm), and product species: acetylene, ethanol, methanol, ethylene, methyl-ethyl ether, formaldehyde, formic acid, acetone, n-propanol, ethane and isopropyl alcohol. Results of the thermodynamic processing of dimethyl ether with steam indicate the complete conversion… more
Date: October 1, 2004
Creator: Semelsberger, T.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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KINETICS OF DIRECT OXIDATION OF H2S IN COAL GAS TO ELEMENTAL SULFUR

Description: The direct oxidation of H{sub 2}S to elemental sulfur in the presence of SO{sub 2} is ideally suited for coal gas from commercial gasifiers with a quench system to remove essentially all the trace contaminants except H{sub 2}S. This direct oxidation process has the potential to produce a super clean coal gas more economically than both conventional amine-based processes and the hot-gas desulfurization using regenerable metal oxide sorbents followed by Direct Sulfur Recovery Process. The objecti… more
Date: January 1, 2004
Creator: Kwon, K.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ADVANCED HEAT EXCHANGERS USING TUNABLE NANOSCALE-MOLECULAR ASSEMBLY

Description: Steam condensation heat transfer on smooth horizontal tubes and enhanced tubes (TURBO-CDI and TURBO-CSL) along with nanoscale hydrophobic coated tubes was studied experimentally. Hydrophobic coatings have been created through self-assembled mono layers (SAMs) on copper alloy (99.9% Cu, 0.1% P) surfaces to enhance steam condensation through dropwise condensation. In general, a SAM system with a long-chain, hydrophobic group is nano-resistant, meaning that such a system forms a protective hydroph… more
Date: January 1, 2004
Creator: Kim, Kwang J.; Bell, Thomas W.; Vemuri, Srinivas & Govindaraju, Sailaja
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fundamental Investigation of Fuel Transformations in Pulverized Coal Combustion and Gasification Technologies Annual Report

Description: The goal of this project is to carry out the necessary experiments and analyses to extend leading submodels of coal transformations to the new conditions anticipated in next-generation energy technologies. During the first two projects years, significant progress was made on most of the tasks, as described in detail in the two previous annual reports. In the current third annual report, we report in detail on the BYU task on the properties and intrinsic reactivities of chars prepared at high-pr… more
Date: January 1, 2004
Creator: Hurt, Robert; Calo, Joseph; Fletcher, Thomas & Sayre, Alan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Alternative Ionization Methods for Particle Mass Spectrometry

Description: The objective of this project is to enhance the capabilities of a real-time airborne particle mass spectrometer by implementing matrix-independent methods for sample ionization. The enhancements should result in improved sensitivity for trace substances and, more importantly, permit quantitative determination of the presence of target species in microparticle samples on an individual particle basis. We have used two different approaches to eliminate matrix effects on quantitative accuracy. Both… more
Date: June 1, 2004
Creator: Whitten, William & Reilly, Peter T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurement of Shear Strength in BCC Materials Subjected to Moderate Pressures

Description: An experimental procedure is reported to perform shear tests on specimens held under moderately high hydrostatic pressures (on the order of 10 GPa). The mechanical behavior of materials subjected to such pressures, varies substantially from that observed at atmospheric pressure or even pressures typically attained during industrial processing. These differences must be incorporated into models such as the Steinberg-Guinan hardening model or discrete dislocation dynamics simulations. The goal of… more
Date: February 17, 2004
Creator: Bonner, B.; Leblanc, M.; Lassila, D.; Field, D. & Escobedo, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Boiling Visualization and Critical Heat Flux Phenomena In Narrow Rectangular Gap

Description: An experimental study was performed to investifate the pool boling critical hear flux (CHF) on one-dimensional inclined rectangular channels with narrow gaps by changing the orientation of a copper test heater assembly. In a pool of saturated water at atmospheric pressure, the test parameters include the gap sizes of 1,2,5, and 10 mm, andthe surface orientation angles from the downward facing position (180 degrees) to the vertical position (90 degress) respectively.
Date: December 1, 2004
Creator: Kim, J. J.; Kim, Y. H.; Kim, S. J.; Noh, S. W.; Suh, K. Y.; Rempe, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effect of pressure on the luminescence emissions in CuGaSe2

Description: We present the results of a pressure-dependent photoluminescence (PL) study on CuGaSe{sub 2} films grown on GaAs substrate by metalorganic vapor phase epitaxy. The low-temperature PL spectra of the CuGaSe{sub 2} samples measured at atmospheric pressure are dominated by one near band-edge exciton luminescence line and two strong and relatively broad emissions associated with donor acceptor pairs (DAP). All the observed luminescence emission lines shift toward higher energy with increasing pressu… more
Date: July 13, 2004
Creator: Shan, W.; Walukiewicz, W.; Wu, J.; Yu, K. M.; Ager, J. W., III; Siebentritt, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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