Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 44 for “"elevated pressures"”.
-
Ignition Delay Times of Natural Gas/Hydrogen Blends at Elevated Pressures
… 80%; equivalence ratios of 0.3, 0.5, or 1; and pressures of 1, 10, or 30 atm. Temperatures ranged from 1092 K to 1722 K, and all mixtures were diluted in 90% Ar. Correlations for each combination were developed from the ignition delay times and, using these correlations, a factor sensitivity …
-
Flow Regime Transitions at Elevated Pressures in Vertical Two-Phase Flow
Made available in DSpace on 2014-12-09T17:13:39Z (GMT). No. of bitstreams: 1 6706548.pdf: 8726536 bytes, checksum: 8929d6a41e10eef5d3b339b5acbc3e81 (MD5) Previous issue date: 1966
-
Numerical Modelling of Sooting Laminar Diffusion Flames at Elevated Pressures and Microgravity
… devices, which typically operate at high pressures, and fire suppression systems in space. Flames display significant changes under microgravity and high-pressure conditions as compared to normal-gravity flames at atmospheric pressure, but the exact causes of these changes are not …
-
PVTX and Raman Spectral Properties of Fluids at Elevated Pressures and Temperatures
… is experimentally determined at temperatures and pressures relevant to magmatic-hydrothermal systems using synthetic fluid inclusions. The partitioning behavior is then combined with literature data to calculate the Na/K ratio of the original silicate melt phase in a magma body before the …
-
Quartz solubility in potassium hydroxide solutions under elevated pressures and temperatures with some geological applications
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1954.
-
Computational fluid dynamics simulations of oxy-coal combustion for carbon capture at atmospheric and elevated pressures
… because of the enhanced reaction rates at elevated pressures. Therefore, the burner can be operated at a higher burner velocity at elevated operating pressure, which results in a much higher coal throughput using the same reactor size. For instance, the thermal load can be increased from 3 …
-
Electrokinetic and Chemical Aspects of Transport of Chloride Brines Through Compacted Smectite Layers at Elevated Pressures (Electroosmosis, Streaming, Conductivity)
Solutions of NaCl and NaCl-CaCl were forced through clay plugs made by compacting the 0.2 to 2.0 micron size fraction of Cheto montmorillonite. The concentration of NaCl solution was either 1.10 m or 1.087 m, and that of NaCl-CaCl(,2) solution was 0.92 m in NaCl and 0.075 m in CaCl(,2). Clay plug …
-
Steam Electrolysis Coupled with CO2 Conversion in a Pressurized Proton Conducting Solid Oxide Electrolysis Cell
… Although no liquid hydrocarbons were produced at elevated pressures, the H-SOEC was able to synthesize CO, H2 and CH4 from steam and CO2. The electrochemical performance of this cell was modest with a maximum current density of 42 mA cm-2 (at 5 V), due to the presence of mass transfer limitations …
-
Ignition and Combustion of Boron Particles in Hydrogen/oxygen Combustion Products at 30 to 150 Atmospheres
… demonstrate that boron particle lifetimes at elevated pressures are sufficiently short to make these particles suitable for additives to propellants and that smaller 1-10 $\mu$m sized particles, which have still shorter lifetimes, may be appropriate for addition to explosives.
-
Flame Studies on Conventional, Alternative, and Surrogate Jet Fuels, and Their Reference Hydrocarbons
… By extending the flame propagation studies to elevated pressures up to 3 atm, it is found that the flame speed results at elevated pressures are consistent in the trend with atmospheric results. Further attempts are made to identify and quantify the effects of preheat temperature and pressure …
-
Improving Off-line and On-line Supercritical Fluid Extraction Techniques by Elevating the Post-Restrictor Pressure
… trapping becomes much simpler when working at elevated pressures as the need for sorbent trapping is virtually eliminated and solvent trapping may be conducted with much less difficulty. Elevated post-restrictor pressures were found to be very beneficial for on-line work as well. SFE/GC was …
-
Flame-flow interaction during premixed and stratified swirl flame flashback in an annular swirl combustor
… These flashback experiments are conducted at pressures ranging from 1 to 5 atm. To understand the flame-flow interaction physics, I developed a novel analysis methodology for low-turbulence fully-premixed methane-air swirl flame flashback, by stacking the planar flame profiles and …
-
Experimental Characterization of Heat Transfer and Fluid Flow in TCR Fuel Elements under Varying Operational Conditions
… cooling medium, with experiments carried out at pressures ranging from 300 to 600 psi and temperatures spanning 100°C to 300°C. Critical parameters, including inlet and outlet gas temperatures, wall temperatures at both ends of the core, and coolant flow rates were monitored to evaluate thermal …
-
Exploration and Development of Electrically Controllable Gel and Solid Propellants
… atmospheric conditions, and then finally under elevated pressures. The first study explores the ability to electrically control the decomposition characteristics of various solid oxidizers. Typical composite solid propellants are composed of solid fuels and oxidizers and isolating the oxidizer …
-
Pressure Variation Assisted Fiber Extraction and Development of High Performance Natural Fiber Composites and Nanocomposites
… hemicelluloses, and lignin. When subjected to elevated pressures and temperatures, we are able to get access to some of these natural polymers and use them as a matrix material for composite fabrication. Therefore, fabrication of composite materials without addition of synthetic polymers is …
-
Small angle scattering characterisation of micellar systems and templated architectures
… surfactant solution were also subjected to elevated pressures of varying gas atmospheres. Detailed modelling of the in-situ SANS experiments revealed information of the size and shape of the micelles at a number of different pressures. Also reported in this thesis is the characterisation of …
-
In Situ Flame Structure Imaging of Composite Propellants using High-Speed Planar Laser-Induced Fluorescence
… 150 μm display similar flame structures for the pressures investigated (0.1-0.7 MPa). For propellants with AP particles larger than about 150 μm, all propellants burning at 1 atm display jet-like flames above individual coarse AP crystals. If the coarse AP concentration is high enough, group …
-
Modeling and validation of a syntactic foam lining for noise control devices for fluid power systems
… compliance in these devices, especially at elevated pressures, is through a liner made of syntactic foam, which in this case is a urethane host matrix with embedded hollow, polymer microspheres. The material properties at elevated pressure are unknown by the liner manufacturer, but are known …
-
Novel Conceptual Design And Anlysis Of Polymer Derived Ceramic Mems Sensors For Gas Turbine Environment
… include high temperatures (500-1500°C), elevated pressures (200-400 psi), pressure oscillations, corrosive environments (oxidizing conditions, gaseous alkali, and water vapors), surface coating or fouling, and high particulate loading. Several technologies are currently underdeveloped for …
Page 1 of 3