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 645 for “"Multiphase"”.
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Multiphase Fountains
… the rise height and entrainment of axisymmetric multiphase fountains. The aim of this thesis is to improve our understanding of these fundamental flows frequently observed in industry and nature. In each chapter we present a series of laboratory experiments and we employ various dye …
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Electrohydrodynamic manipulation of multiphase fluids
In microfluidic devices, the fluid can be manipulated either as continuous streams or droplets. The latter is particularly attractive as individual droplets can not only move but also split and fuse, thus offer a greater flexibility in applications such as a laboratory-on- a-chip. In this thesis, a …
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Vibrations for improving multiphase contact
Present work demonstrates the use of vibrations to enhance performance of two multi-phase contacting systems: a bubble column for gas-liquid contacting (physical absorption) and a Piston Oscillating Monolith Reactor (POMR) for gas-liquid-solid contacting (catalytic reactions). In a bubble column …
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Multiphase Flows In Vertical Pipelines
… and numerical models have been employed to model multiphase flow behavior and have been showing good agreement against experimental providing then a robust tool for the modeling of multiphase flows. Throughout this dissertation, different techniques of two-phase flow modeling through vertical …
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The Stability of Multiphase Suspensions
When sufficient quantities of buoyant particles are mixed with a sedimenting suspension of heavy particles, the two types of solids undergo rapid lateral segregation from each other. Streams containing the less populous species form and flow through a concentrated continuum suspension of the more …
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Experiments on Stratified Multiphase Plumes
Buoyant plumes are flows of great interest to engineers and geologists alike with applications varying from chemical engineering processes to explosive volcanic eruption columns. Single-phase plumes have been well studied and the flow’s behaviour is generally well understood, however many examples …
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Multiphase Hydrodynamics in Flotation Systems
Flotation is a complex, multiphase process used to separate minerals. Four problems central to the fundamentals of the flotation process were studied. A multiphase grid turbulence experiment was conducted to verify particle collision models. The slip velocities of solid particles and bubbles were …
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Lead pursuit control of multiphase drives
Los accionamientos multifásicos, compuestos por una máquina eléctrica de más de tres fases alimentada por un convertidor de potencia, han atraído recientemente un importante interés en la comunidad investigadora debido a las ventajas que presentan frente a las máquinas trifásicas convencionales. …
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Multiphase Electrical Machines for Vehicular Traction
L'abstract è presente nell'allegato / the abstract is in the attachment
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Computational studies of viscoelastic multiphase flows
A finite element code based on the level set method is developed for performing two and three dimensional direct numerical simulations (DNS) of viscoelastic two-phase flow problems. The Oldroyd-B constitutive equation is used to model the viscoelastic liquid. The code is used to study transient and …
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Multiphase flows in polymer microfluidic systems
… of segmented reagents using pressure-driven multiphase flow in microchannels is a promising technology for high throughput microfluidic bioassays. Separation and encapsulation of the target reagents with another inert fluid provide many advantages over single phase flow in microfluidic …
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Lattice Boltzmann simulations of multiphase flows
… Method (LBM) for the purpose of simulating multiphase flows relevant to Air Conditioning and Refrigeration Center (ACRC) applications. Other methodologies have been used to simulate multiphase flow including finite volume based Navier-Stokes solvers. These methods have found reasonable …
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Multiphase CFD modelling of stirred tanks
… involving gas-liquid systems, the need for multiphase modelling of stirred tanks became increasingly important. This has led to more research studies involving multiphase flows. Most of the work reported showed good prediction of the velocity data and the power draw, reasonable turbulence …
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Multiphase immiscible flow through porous media
A finite element model is developed for multiphase flow through soil involving three immiscible fluids: namely air, water, and an organic fluid. A variational method is employed for the finite element formulation corresponding to the coupled differential equations governing the flow of the three …
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Subpixel Resolution Schemes for Multiphase Flows
This effort explores novel sub-resolution particle center estimation algorithms for Digital Particle Tracking Velocimetry (DPIV). The errors of these new methods were classified through Monte-Carlo simulations. These schemes provide direct measurements of the apparent particle image diameter and …
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Structure-property relationships of multiphase copolymers
Over the years there have been many studies on the theoretical and phenomenalogical aspects of starblock, di- and tri-block copolymer systems with very narrow molecular weight distributions. However, in many real multiblock systems the effect of such variables as; chemical composition distribution, …
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Engineering properties of multiphase block copolymers
… ≃16,000) could be obtained as either single or multiphase systems depending upon their previous thermal history. Homogeneous films, with a single intermediate Tg, were obtained via solution casting, whereas compression molding provided films exhibiting two Tg's. Subsequent DSC studies pointed …
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PWM strategies for multilevel multiphase AC drives
… width modulation (PWM) strategies for multilevel multiphase ac drives have been analysed in this thesis. The large amount of published work in the area of multiphase drives recognises their advantages compared to the standard three-phase solutions. Some of them arc improved power sharing …
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