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 22 for “"Non – Spherical Particles"”.
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Microscale dynamics in suspensions of non-spherical particles
… the microscale dynamics in suspensions of spherical and non-spherical particles. Two new algorithms were developed to enable studies with accurate hydrodynamics. The first algorithm was a high accuracy Stokesian Dynamics technique (SD) extended to a generic non-spherical particle shape. The …
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Learning-Based Control for Optically Trapped Non-Spherical Particles
… the momentum of light to manipulate these small particles by trapping them near the focal point of a sharply focused laser beam. Since the inception of optical trapping in 1986, it has enabled many scientific discoveries at the small scale. Many optical trapping applications involve trapping …
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Investigation of Momentum and Heat Transfer in Flow Past Suspensions of Non-Spherical Particles
… and the shape of the particle. The behavior of non-spherical particles deviates considerably from spherical particle shapes which have been studied extensively in the literature. Momentum transfer, to first-order, is driven by drag forces experienced by the particles in suspension, followed by …
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Investigation of Particle Velocity and Drag with Spherical and Non-Spherical Particles Through a Backward Facing Step
… applications exist where dispersed solid particles are transported within a turbulent accelerating or decelerating gaseous flow. The large density variation between phases creates the potential for significant differences in velocity known as velocity slip. Flow over a backward facing step …
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Study of Fluid Forces and Heat Transfer on Non-spherical Particles in Assembly Using Particle Resolved Simulation
… systems. Most of the studies have focused on spherical particle shapes, however, in most natural and industrial processes, the particle shape is seldom spherical. In fact, particle shape is one of the important parameters that can have a significant impact on momentum, heat and mass transfer, …
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Preparation of anisotropic microparticles and their behaviour at liquid interfaces
Monolayers of solid particles at the liquid- fluid interface are of considerable interest in both academia and industry. Their behaviour during compression and expansion experiments in a Langmuir trough has important implications on particle stabilisation of foams and emulsions. This has been known …
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Numerical models for rotating Lagrangian particles in turbulent flows
… aircraft engine degradation due to ingestion of non-aqueous particulates such as sand, dust, and ash. This dissertation introduces high fidelity Lagrangian particle models to account for the rotational effects of particles in complex turbulent flows. Part of the focus of the research is to …
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Optical properties of concentrated dispersions
… and concentration has been investigated for non-spherical particles in concentrated dispersions, over a range of pH and surfactant concentrations. Measurements of diffuse transmittance and reflectance required large corrections to be made £->r the presence of any specular interfaces i.e. …
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Random Packs and Their Use in Modeling High Speed Porous Flow
… by incorporating a level set scheme to pack non-spherical shapes that are more relevant in many complex materials such as HMX and pressed gun propellants. We have obtained results for dense random packs of various convex shapes such as gel capsules, cylinders, and polyhedra. As an example …
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Application of a Non-intrusive Optical Non-spherical Particle Sizing Sensor at Turboshaft Engine Inlet
… Propulsion and Power Laboratory developed a non-intrusive optical sensor that is able to characterize non-spherical particles. This sensor has been used in various applications through the years; however, most recently, the sensor has been demonstrated at the Virginia Tech M250 engine inlet. …
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Development of Bacteria-Based Bio-Hybrid Delivery Systems: Fabrication, and Characterization of Chemotaxis and Quorum Sensing
… objects. More specifically, because micro/nanoparticles are able to transport cargos efficiently and bacteria can play the role of targeted and selective delivery agents, a hybrid of these two can advance the current strategies for environmental monitoring, drug delivery and medical imaging. …
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Theory and Applications of the Aerodynamic Aerosol Classifier
… relatively new instrument, which selects aerosol particles based on their relaxation times or aerodynamic diameters. This dissertation demonstrates that the novel operating principle of the AAC has the potential to address a variety of challenges facing the field of aerosol science. To explore the …
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CFD – DEM Modeling and Parallel Implementation of Three Dimensional Non- Spherical Particulate Systems
… combustion, blood cellular systems and granular particles in fluidized beds, have often been computationally represented using spherical surfaces, even though the majority of particles in archetypal fluid-solid systems are non-spherical. While spherical particles are more cost-effective to …
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Models for sound propagation in suspensions and emulsions
… (i) with heat transfer assuming incompressible particles and (ii) with a compressible particulate phase neglecting heat transfer. Type (i) models are examined analytically and compared to scattering theory. Types (i) and (ii) are compared and brought together in a more general coupled phase …
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Particle Sensing in Gas Turbine Inlets Using Optical Measurements and Machine Learning
… are attractive for this application due to their non-intrusive nature. However, conventional optical particle measurement methods assume the particle to be spherical, which introduces large errors for measuring particles with complex and irregular shapes, such as sand, volcanic ash, and ice …
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Non-invasive Measurement of Cholesterol in Human Blood by Impedance Technique: an Investigation by Finite Element Field Modelling
The main topic of this work is detection of solid particles suspended in conductive medium and development of methodologies for determining cholesterol levels in human blood non-invasively by electrical impedance technique. The main part of this research is focused on the development of …
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Response of Electrified Micro-Jets to Electrohydrodynamic Perturbations
… density as the slender liquid segments recover spherical shapes at x~0.7, and simple varicose mode near wave numbers of unity. The phenomena observed in this work may be explained by a linear model and rationalized by the phase diagram in the space of wave number and dimensionless charge levels. …
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Multiscale simulation of heterophase polymerization : application to the synthesis of multicomponent colloidal polymer particles
… the synthesis of structured or composite polymer particles by multi-stage seeded emulsion polymerization. This type of process is used for the preparation of high performance materials where a synergistic behavior of two or more different types of polymers is obtained. Some examples include the …
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Numerické simulace transportu a depozice vláken v zjednodušeném modelu dýchacích cest
Rigid particles such as fiber particles, asbestos or MMMFs (man-made mineral fibers) are harmful to human health when inhaled because of their abundance in the atmosphere, composition, and ability to penetrate deep into human lungs. It can cause lung cancer and numerous other diseases according to …
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