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 37 for “"particle-scale"”.
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Understanding bulk behavior of particulate materials from particle scale simulations
… bulk behaviors of particulate materials from particle scale simulations. Packing properties of assembly of particles are investigated first, focusing on the effects of particle size, surface energy, and aspect ratio on the coordination number, porosity, and packing structures. The simulation …
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Development of particle-scale simulation methods for multiphase flow study
<p>This dissertation is focused on the particle-scale numerical simulations in two areas: fast pyrolysis of biomass particles and interactions of fuel drops and heated walls.</p> <p>The first topic is the fast pyrolysis of biomass materials, an effective means to convert biomass into useful energy …
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Parallel implementation and application of particle scale heat transfer in the Discrete Element Method
… high fidelity Discrete Element Method (DEM) for particle scale simulations coupled to Computational Fluid Dynamics (CFD) requires large simulation times and limits application to small particulate systems. The overall goal of this research is to develop and implement parallelization techniques …
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CFD-DEM MODELLING OF PARTICLE-GAS REACTIVE FLOWS AND ITS APPLICATION IN BLAST FURNACE REGIONS
The ironmaking blast furnace involves complex particle-gas reactive flows, which are crucial for determining the efficiency and effectiveness of iron production. A fundamental understanding of these intricate reactive flows is essential for optimizing furnace operation and performance. This thesis …
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Laboratory Experiments Investigating Entrainment By Debris Flows
… of the debris flow. The mechanics underlying the particle entrainment are not well-understood. Existing models for the entrainment process include those that explicitly consider stress ratios, the angle of inclination, and the particle fluxes relative to those achieved under steady conditions. …
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Advances in the Hyperspectral Imaging Microscope Spectrometer Method, and Application for Measuring the Spectral Reflectance of Light Absorbing Aerosols from the South Cascades, Colorado Rockies, and Iceland
Snow and glaciers are receding at a global scale. Warming temperatures are often identified as the dominant cause of this decline; however, deposition of light absorbing aerosols (LAA), including black carbon, mineral dust and organics onto snow and glacier surfaces can be an even larger driver of …
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Mathematical modelling of agglomerate scale phenomena in heap bioleaching
… modelling has moved from models that emphasize particle scale processes to models that emph8size bulk scale processes. In many cases however, the particle scale effects in these bulk scale models are quite simplified. This thesis aims to provide a means for the systematic integration of particle …
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Laboratory Debris Flow Experiments: A Study of Erosion
… ϕN generally decreases. We then consider particle scale dynamics that drive these macroscopic results including segregation mechanisms, inter-particle collisions, and relative roughness.
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CFD-DEM modelling of liquid-solid-gas flow in rotary drums and an application in solar panel leaching
… gases and the typically nonspherical nature of particles in the rotary drums, this thesis developed an unresolved reactive superquadric computational fluid dynamics-discrete element method (CFD-DEM) coupled with the volume of fluid (VOF) to describe the complex behaviours of …
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Micromechanical Aspects of Aging in Granular Soils
… dissolution of silica and precipitation at the particle contacts, cementation due to microbiological activity, internal stress redistribution caused by particle crushing, and buckling of the load chains due to particle slippage. New evidence points out that internal and time-dependent changes in …
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Predictions of leachate generation from minerals processing waste deposits
… such as intrinsic chemical kinetics, intra-particle diffusion, external mass transfer and hydrodynamic considerations are lumped into a single parameter. The result of this approach is an effective reaction rate for the release of hazardous constituents from a volume element of the waste …
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Energy localization and heat generation in composite energetic systems under high-frequency mechanical excitation
… bonded explosives, as well as single energetic particles embedded within a viscoelastic binder, is studied. In this work, the fundamental mechanisms associated with the conversion of high-frequency mechanical excitation to heat as applied to these composite energetic systems are thoroughly …
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Experimental and computational analysis of random cylinder packings with applications
… ordering, orientational ordering, and the particle-particle contacts. Furthermore, the void space in the packings was expressed as a pore network, which retains topological and geometrical information. The significance of this approach is that any irregular continuous porous space can be …
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Hydrodynamics Of Trickle Bed Reactors: Measurements And Modeling
… case a closed form approach of coupling bed and particle scale solution within CFD framework was presented.
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Modeling ignition and extinction in condensed phase combustion
… oxide, can predict the events observed at the particle scale in the experiments. Furthermore, the characteristics of a steady diffusion flame that arises at the interfaces of two condensed phase reactant (titanium-boron) and gas reactant (methane-air) streams that form an opposed counterflow …
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Direct numerical simulation of bubble-bubble and droplet-droplet interaction using a Surface Thin Film model
… the simulation of dispersed multiphase flow. The particle-particle and particle-fluid interactions in this class of flows play an important role on the hydrodynamics and fluid transport phenomena that govern the overall flow behaviour. Accurate computational modelling of the particle-particle and …
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Degradation Mechanisms and Applications in Ion Intercalation Materials
… level, LiBs operate at a micrometer lengthscale, but consist of many active material nanoparticles which participate in reversible electrochemical reactions that store and release energy. These particles control the crucial processes for energy storage in macroscopic devices, generating a …
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Indirect selective laser sintering of ceramics
… binder is added to effectively glues the ceramic particles together during shaping. Selective Laser Sintering (SLS) is capable of producing small complex polymer features, but how this capability translates to indirect SLS of ceramics is an open question. This dissertation aims to systematically …
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Gasification and combustion modeling for porous char particles
Gasification and combustion of porous char particles occurs in many industrial applications. Reactor-scale outputs of importance depend critically on processes that occur at the particle-scale. Because char particles often possess a wide range of pore sizes and react under varying operating …
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Fundamental Studies of Chemical Looping Combustion with Oxygen Uncoupling (CLOU) of Biomass Char
… which utilises lattice oxygen contained in solid particles of an inorganic oxide (the ‘oxygen carrier’) to combust fuels, enabling the collection of products of combustion (CO₂ and H₂O) undiluted with nitrogen. It offers, therefore, an attractive method for capturing CO₂ for use or for …
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