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 324 for “"Multi-Phase"”.
-
Multi-Phase Smart Converter for PV System
… on this alternative PV system configuration, a multi-phase smart converter with single controller is proposed as a low cost panel-level MPPT solution. This proposal can largely reduce cost by saving MPPT controllers, current and voltage sensors without sacrificing energy production. The …
-
Multi phase numerical modelling of thickening and sedimentation
… susepnsion are represented as separate phases with distinct concentrations and velocities. A multiphase representation of the settling process gives greater detail of the interactions present between the particulates. The build up of the sediment as well as a prediction of the …
-
Wide-bandwidth digital controller for multi-phase converters
… practical wide bandwidth digital controller for multiphase buck converters. Traditional implementations of multiphase converters have a performance comparable to single-phase implementations, with a bandwidth limited to a fraction of the per-phase switching frequency Fsw. The goal of this project …
-
Mixed-solution, multi-phase single-well reservoir model, A
Includes bibliographical references (pages 101-103).
-
Microscopic Strain Localization and Damage in Multi-phase Alloys
… microscopic strain localization and damage in multiphase alloys is challenging. In addition to distinct phase-specific properties, extra complexities arise from a broad spectrum of morphology and spatial distribution of phases. Multiple deformation mechanisms can also occur simultaneously, …
-
Numerical Methods for Compressible Multi-phase flows with Surface Tension
… series of computation methods for compressible multi-phase flows with capillary effects based upon the full seven-equation Baer-Nunziato model. For that reason, there are some numerical methods to obtain high accuracy solutions, which will be shown here. First, a high resolution shock capturing …
-
Laboratory experiments of multi-phase plumes in stratification and crossflow
… of droplets and bubbles were measured using a phase Doppler particle analyzer. To control particle size, sediment was also used; sediment size was measured using a micrometer. Slip velocities among all buoyancy sources ranged from 3 to 35 cm/s. Stratified experiments investigated the dependence …
-
Experimental Study of Multi-phase Flow Hydrodynamics in Stirring Tanks
… cells are widely used stirring tanks in phase separation where multiphase flow is involved. Flotation refers to the process in which air bubbles selectively pick up hydrophobic particles and separate them from hydrophilic solids. This technology is used throughout the mining industry as …
-
Quantitative phase-field modeling of crack propagation in multi-phase materials
… capable of designing micro-architectures of phases to improve fracture toughness and damage tolerance of ZrB<sub>2</sub>-based ultra-high temperature ceramics (UHTCs). A quantitative phase-field model based on the regularized formulation of Griffith’s theory is presented for crack propagation …
-
FINITE ELEMENT METHODS AND MACHINE LEARNING FOR SOME MULTI-PHASE PROBLEMS
… studies novel computational methodologies for multi-phase problems. The first part of the thesis focus on computational models for complex interface coupled flow problems. The problem is studied both numerically and analytically. More specifically, an unfitted finite ele- ment approach for the …
-
Dynamic and stimuli-responsive multi-phase emulsion droplets for optical components
… imaging, sensing, and display technologies. Multi-phase emulsions are micro-scale droplets formed from multiple immiscible material components suspended in a fluid medium. An interesting aspect of these droplets is that by tailoring the chemistry of the surrounding medium it is possible to …
-
A novel concept of series connected multi-phase, multi-motor drive systems
… control of more than one electric motor. These multi-motor drives are generally available in two configurations. The first one consists of a number of three-phase voltage source inverters (VSI) connected in parallel to a common DC link, each inverter feeding a three-phase AC motor. This …
-
A Unified Model for Multi-Phase Flow and Heat Transfer in Wellbores
<p>Multiphase flow is a common occurrence in the chemical and petroleum industries. The objective of this study was to apply the principles of multiphase flow to the production of petroleum fluids. A unified model was developed to predict the pressure profiles in wellbores using models available in …
-
Mass flow measurement of multi-phase mixtures by means of tomographic techniques
… long-term goal of this research is to develop a multi-phase flowmeter for the on-line monitoring of an airlift used in an offshore mining application. This requires the measurement of both the individual component volume fractions and their velocities. Tomography provides a convenient …
-
Experimental and Numerical Study of Multi- Phase Flow in a Coaxial Air Jet
… that did not exist. The next paper described two phase flow created by the introduction of polymer particles into the air stream to the central air jet. A sheet of laser light and high speed digital imaging were used to determine the particle velocities, which varied widely because the particle …
-
Multi-Phase Mediator Analysis of a Social Cognitive Church-Based Physical Activity Intervention
This study tested an integrated social cognitive model of physical activity intention formation, onset, and maintenance among sedentary participants (N = 465) in a church-based, social cognitive, physical activity intervention. Three separate models were tested via structural equation modeling. …
-
An integrated peridynamics-finite volume based multi-phase flow, geomechanics and hydraulic fracture model
… the interaction of hydraulic fractures with multi-scale heterogeneities such as natural fractures, stress/barrier layers, bedding planes, shale laminations, and mineralogy. Moreover, hydraulic fractures originating from different clusters or stages in a multi-stage, multi-cluster treatment …
-
Computational fluid dynamics modelling of multi-phase flow transition in presence of solid particles.
Multi-phase flow is the type of flow common in the oil and gas industry, as oil reservoirs contain mixtures of oil, gas and water with sand particles from sandstone reservoirs. Accurate design of oil and gas production equipment greatly depends on detailed understanding of this flow phenomena. …
Page 1 of 17