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 20 of 35 for “"Phase mixing"”.
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Multi-scale modeling tools for coupled reaction, phase equilibrium and two-phase mixing phenomena with application to supercritical water heavy oil upgrading process
… a complex process involving coupled reactions, phase equilibrium and two-phase mixing phenomena. This thesis presents the development of a range of models and tools to simulate such processes at different scales with varying levels of fidelity in describing the underlying physical phenomena. …
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Fluid Dynamics And Scale-Up Of Bubble Columns With Internals
Bubble columns and slurry bubble columns, as multiphase reactors, are favored for a wide range of applications in the chemical, biochemical, petrochemical and metallurgical industries. They are considered the reactor of choice for the Fischer Tropsch synthesis, among other applications, offering an …
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Phase Space Structure of Disequilibrium in the Milky Way
… observations of spiral structure in the vertical phase space of the Milky Way have been made. In this thesis we set out to explain these structures, using a combination of analytic modeling, simulations, and Dynamic Mode Decomposition to study explicitly their formation and evolution in the …
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Countercurrent chromatography of proteins using aqueous two-phase systems
… small organic molecules using aqueous - organic phase systems. Aqueous two - phase systems (ATPS) have been used historically to purify bio-molecules whilst retaining their biological function. This thesis focuses on extending CCC to the separation of proteins, using a model ATPS of PEG-1000 and …
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Structure-property behavior of free radical synthesized polydimethylsiloxane-polystyrene block polymers and polytetramethyleneoxide based ionene elastomers
… PS blocks changed, the morphology, the degree of phase mixing, and bulk properties of these PDMS-PS block polymers were altered as expected. At constant conversion level, the morphology of these block polymers changed from spherical PS domains in the PDMS matrix to a lamellar structure as the PDMS …
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Siloxane modified hybrid materials by the sol-gel process
… relationship study. The degree of phase mixing or the encapsulation of the siloxane phase by the inorganic oxide increases with higher TIP content. This behaviour was seen by both the dielectric and dynamic mechanical studies. The modulus and the stress to break increased with …
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Simulation of High Frequency Waves Reflected From a Turbulent Ionosphere for Spread Spectrum Systems
… received wave field is performed by using the phase screen-diffraction layer method. This scheme simulates the propagation of an HF wave in the turbulent ionosphere. Based on the forward-scatter approximation, the scheme computes sequentially the effects of phase fluctuations due to the …
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Siloxane modified polyurea and polyurethane urea segmented copolymers
… molecular weight and to more extensive microphase separation between the segments. In addition, the surface structure of segmented polyether urea and polyurethane urea copolymers were modified in two ways: siloxane urea segmented copolymers were synthesized and physically blended into the …
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Plagioclase preferred orientation in layered mylonites : evaluation of flow laws for the lower crust
… size and proportion of pyroxenes. Progressive mixing of pyroxene and plagioclase within gabbro mylonite layers is accompanied by weakening of the LPO indicating that phase mixing promotes a transition to diffusion creep processes that involve grain boundary sliding. Our results indicate that …
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Plagioclase preferred orientation in the layered mylonites : evaluation of flow laws for the lower crust
… size and proportion of pyroxenes. Progressive mixing of pyroxene and plagioclase within gabbro mylonite layers is accompanied by weakening of the LPO indicating that phase mixing promotes a transition to diffusion creep processes that involve grain boundary sliding. Our results indicate that …
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TEM/EDXS studies of phase separation in block and graft copolymers
… and distribution. Effects of the kinetics of phase-separation were also determined . Thick (approximately lmm) films cast from solvent showed more complete phase separation than either thin (about 10nm) cast films or compression-molded specimens. Spherical domains formed in alternating …
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Positron emission particle tracking applied to solid-liquid mixing in mechanically agitated vessels
… agitated vessels are widely used for various mixing operations within a wide range of industries including the chemical, pharmaceutical, food and petroleum industries. They are used for liquid blending, solid-liquid mixing, gas dispersion in liquids, heat/mass transfer enhancement and chemical …
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Mathematical Modelling of Tower Fermentation Processes
… including: (1) a model to describe liquid-phase mixing in bubble columns and tower fermenters; (2) an empirical method for predicting mixing parameters for both the backflow stirred tanks model and the axially-dispersed plug flow model; (3) a theoretical model describing oxygen mass …
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Contributions to mixing and hypocoercivity in kinetic models
… the so-called Landau damping happens through phase mixing. My contributions include a simplified linear analysis for the Vlasov–Poisson equation around the spatially homogeneous state. For the Kuramoto equation, I cover the linear analysis around general stationary states and show nonlinear …
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Design and construction of a liquid-liquid extractor utilizing ultrasonic energy
… of ultrasonic energy on mass transfer in two-phase multiple-component liquid systems. A liquid-liquid extractor incorporating an ultrasonic generator and transducer was designed and constructed to the following specifications: (1) insonation frequency of 400 kilocycles per second, (2) …
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Mechanisms of Shear Zone Localization and Raman Thermobarometry in Spinel Peridotites from the Alpine Fault, New Zealand
… euhedral grains within larger grains of the same phase. Samples from the second locality also show evidence of dislocation creep but with minimal static grain growth. This set also has a population of ultrafine grains (10µm) and millimeter scale mylonitic banding. The ultramylonite bands exhibit …
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Genesis, dynamics, and dissipation of turbulent magnetic fields
… determines the turbulent spectrum, and efficient phase mixing around current sheets, which leads to electron heating. These results advance a first-principles understanding of the origin and dynamics of cosmic magnetic fields and their implications for astrophysical phenomena.
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Cellulose-based fibers from liquid crystalline solutions
… of the fibers with L increased due to good phase mixing of CAB and L molecules in the fiber matrix.
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Polysiloxane-polyarylester block copolymers: synthesis and characterization
… the synthesis and characterization of multiphase, transparent block copolymers that are potential candidates for passive damping applications in large space structures. Relatively high molecular weight polysiloxane-polyarylester block copolymers were prepared by two different synthetic …
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Well defined graft copolymers and end functional materials: synthesis, characterization and adhesion studies
… These graft copolymers showed little or no phase mixing between the two components as evidenced by differential scanning calorimetry. It was determined by optimization studies that the reaction was complete within 50 hours at 65° C. Increases in initiator concentration surprisingly did not …
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