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.
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Showing 1 to 17 of 17 for “"gas mixing"”.
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Gas mixing in beds of fluidized solids
Thesis (Sc.D.) Massachusetts Institute of Technology. Dept. of Chemical Engineering, 1950.
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A Computational Model of Inert Gas Mixing in the Lung
Inert gases are used as markers or contrast agents in experimental and imaging methods that measure lung function. The premise is that by analysing the expired concentrations of inert gas, or by quantifying their distribution from \textit{in vivo} imaging, information can be gained about the …
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Hydrodynamics, Mixing, and Mass Transfer in Bubble Columns with Internals
… the effects of vertical cooling internals on the gas hydrodynamics, gas mixing, and mass transfer. In addition, this study attempts to develop and validate models that can simulate the radial gas velocity profile and axial gas mixing in the presence and absence of internals. Finally, this work …
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Gas- and solid-mixing behavior in a vibrated-bed microreactor with rapid switching of catalyst between gas atmospheres
… The purpose of this microreactor was to simulate gas- and solid-mixing in a hot-flow microreactor system. The latter is being developed to study carbon deposition rates for continuous Fischer-Tropsch synthesis from a low H₂:CO gas with rapid switching of catalyst between gas atmospheres. The …
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Partial Melting on FeO-Rich Asteroids: Insights to the First Stage of Planetary Differentiation
… the brachinite meteorites through 1-atmosphere, gas-mixing partial melting experiments of an FeO-rich chondritic meteorite.These meteorites represent a continuum of partial melting, akin to that seen in the acapulcoite-lodranite clan of primitive achondrites. Mineral compositions and oxygen …
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Increased Anaerobic Digestion Efficiency via the Use of Thermal Hydrolysis
… digestion to kill pathogens, generate methane gas and reduce odors so the sludge can be safely land applied. In an attempt to reduce sludge volumes and improve sludge dewatering properties, the use of thermal hydrolysis (TH), a sludge pretreatment method, has been adopted by numerous wastewater …
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Advancing Cold Spray for Additive Manufacturing: A Study on Particle Morphology, Gas Nature, and Particle Preheating
… as aluminum and stainless steel, the concept of mixing the propellant gas was introduced in the second objective. Considering the relative costs of gases, powder, electricity, and labour, the second paper focuses on the concept of optimizing the amount of helium to produce the minimum component …
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Phase equilibrium investigations of the Adirondack Class basalts from the Gusev plains, Gusev crater, Mars
… 1390 °C in a piston cylinder apparatus and l-atm gas mixing furnace. The composition is multiply saturated with olivine, orthopyroxene, and spinel on the liquidus at 1310 °C and 1.0 GPa, or 85 km depth on Mars, placing an upper limit constraint on the thickness of the Martian lithosphere at the …
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Sensitivity of methanol-to-olefin reaction to axial gas dispersion: determination in a vibrated-bed microreactor
… of Methanol-To-Olefin (MTO) reaction to axial gas dispersion. It comprises a rectangular horizontal duct, 12.7 mm in height, 25.4 mm in width, variable in length, charged with a 1-mm-deep layer of HZSM-5 catalyst. The microreactor is constructed of aluminum alloy and heated with cartridge …
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Downdraft gasification of biomass
… were to investigate the parameters affecting the gasification process within downdraft gasifiers using biomass feedstocks. In addition to investigations with an open-core gasifier, a novel open-topped throated gasifier was designed and used. A sampling system was designed and installed to …
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NMR response of liquids and of natural gas mixtures
… detecting and characterizing formation oils and gases. This work involves NMR laboratory experiments at a 1 H frequency of 2 MHz. Thermodynamic and transport properties are established by sample preparation or are obtained by measurement or are based on available data. Then, the connection …
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Development of a microreactor system for unsteady-state Fischer- Tropsch synthesis
… “heat-tray.” This reactor involves a supernatant gas flowing over a shallow fluidized bed of catalyst particles. Three systems were built: (1) a vibrofluidized-bed microreactor system for obtaining baseline carbon deposition infonnation under industrially important reaction conditions; (2) a …
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Thermochemical modeling and chemical vapor deposition of two-phase borides in the Hf-Si-B-Cl-H system
… HfB₂-SiB₆ or HfB₂-SiB₄ coatings. The SOLGASMIX-PV computer program was used for these calculations, which were based on ZrCl₄, SiCl₄ BCl₃, and H₂ reactant gases. An array of temperatures (1100, 1300, and 1500K), total pressures (0.02, 0.1, and 1 atm.) and excess hydrogen concentrations …
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Electron beam processing and spectroscopic characterisation of 2D materials and novel nanostructures
… under a constant partial pressure of a precursor gas. A highly focused beam can be used to deposit or etch nanoscale structures on a solid substrate. This technique differentiates itself from classical growth methods through other unique aspects, which include; growth of fully realised …
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The chemical evolution of galaxies explored through multi-object integral field spectroscopy
… via a series of physical processes relating to gas flows into and out of the galaxy. Inflows of gas from the surrounding cosmic web provide fuel for star formation, which subsequently causes an enrichment of the interstellar medium (ISM) with the metals produced within stars, whilst …
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Development of a Novel Multi-Parameter Monitoring Tool for Optimisation and Environmental Compliance of Anaerobic Digestion Technology
… to lower conversion efficiencies and reduced biogas production. Another challenge for AD plants is related to the fact that they can be a source of odours, which can lead to complaints from neighbours living close by or close to digestate land spreading areas. Except for gaseous measurements …
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The crystal chemistry of hibonite: an indicator for oxygen fugacity during Solar nebula condensation?
… earlier in the condensation sequence of a hot gas having Solar composition. Among these minerals, Ti-rich clinopyroxenes, Ca(Mg,Al,Ti)(Si,Al)2O6, and hibonite, Ca(Al,Mg,Ti)12O19, have been used to estimate the fO2 during the Solar Nebula condensation, producing contradictory results, with …