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 54 for “"particle model"”.
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Optimization and State Estimation of Li Ion Cells Using Single Particle Model
… (e.g. satellite power sources). Battery modeling is a key factor to design, optimize and control Li ion cells. Due to reliability and robustness, physics-based models are of great interests with respect to empirical Equivalent Circuit (EC) models. However, the computation burden restricts …
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Detailed population balance modelling of industrial titania synthesis
… for simulating aerosol synthesis of structured particles using a stochastic method. This is developed in the context of the industrial titania (TiO2) process to enable extensive numerical characterisation of the pigmentary product. A reactor network model is used to provide a modular treatment …
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Detailed Population Balance Modelling of Titanium Dioxide Nanoparticle Synthesis
… and applies a new detailed population balance model to study the aerosol synthesis of titanium dioxide nanoparticles. It begins by exploring whether the morphological data captured by an existing detailed particle model can be used in a milling model to relate particle morphology and ultimately …
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Electrodynamic sensors and neural networks for electrical charge tomography.
… of electrodynamic signals. A single charged-particle model is developed to simulate the induction effect on a sensor by a charge. The spatial representation of the voltage induced onto sixteen sensors, placed on the boundary of a circular pipe, gives a flow distribution profile over the …
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Numerical modelling of low temperature plasma
… achieved by applying both analytic and numerical models. Low temperature plasmas are found in both technological and astrophysical contexts. Three different situations are investigated: an instability in electronegative plasmas; electron avalanches during plasma initiation; and a phenomenon called …
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Deterministic and stochastic modelling of a catalytic surface reaction
… importance both for chemical industry and as model systems for the study of pattern formation far from thermodynamic equilibrium. A reaction that has been investigated extensively in experiments is the oxidation of carbon monoxide on platinum.In the present work we first develop a mathematical …
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Morphology and polymorphism of TiO2 nanoparticles prepared in premixed stagnation flames
… the morphology and polymorphism of TiO$_2$ nanoparticles prepared in premixed stagnation flames in order to understand the factors controlling the formation of the particles. Computational models are developed and experimental measurements are performed to characterise the effect of varying …
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Stochastic modelling of silicon nanoparticle synthesis
… methods to study the aerosol synthesis of nano-particles and a new model to simulate the formation of silicon nanoparticles. Population balance modelling is used to model nanoparticle synthesis and a stochastic numerical method is used to solve the governing equations. The population balance …
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Energy levels in light nuclei
The recent application of the shell model theory to the energy level structure of light nuclei has made apparent a lack of experimental data concerning these nuclei. The impossibility of accurately criticizing the theory on the basis of available experimental results has made imperative new …
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Kinetics and transport phenomena in the chemical decomposition of copper oxychloride in the thermochemical Cu-CI Cycle
… In this thesis, a new phase change predictive model is developed and compared to the reaction rate kinetics in order to better understand the nature of resistances. A Stefan boundary condition is used in a new particle model to track the position of the moving solid-liquid interface as the …
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THERMAL MODELS OF LITHIUM-ION CELLS AND BATTERIES
<p> In this research work, a variety of thermal models for lithium-ion cells and battery systems with different materials and configurations were developed by incorporating the cell energy balance equations and the temperature-dependency of cell parameters into the different electrochemical …
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Modeling and Simulation of Bubbles and Particles
… of motion was applied to air bubbles and sand particles of several different diameters. Particle-fluid interactions observed through flow-visualization, particle concentration, particle-wall interactions, and Lagrangian statistics were all considered. These results were interpreted and compared …
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Finite size effects in the thermodynamics of the free scalar field and the interacting SU(3) plasma
… thermodynamic limits, and then we use a quasi-particle model of the SU(3) plasma to shed some light on the interplay of finite-size and generic interaction effects in the context of lattice QCD calculations.
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Simulations of Nanoparticle Synthesis in Laminar Stagnation Flames
… of a multidimensional solver for studying nanoparticle synthesis in laminar flames is presented. The governing equations are convective-diffusive-reactive partial differential equations that are discretised using the finite volume method. Detailed chemical source terms and transport …
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Electronic and structural properties of rare gas cation clusters
… of the system is based on a semi-empirical model whose parameters are obtained through the fitting of experimental and calculated properties such as bond length and dissociation energy of small clusters (N < 6). Since rare gas cation clusters are formed by closed shell atoms with one …
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Aplicação de modelos de quebra de partículas do ambiente de simulação do método dos elementos discretos no estudo de microprocessos de cominuição
… microprocesses were studied using three particle breakage models within the DEM simulation environment: The Bonded Particle Model – BPM, the Fast Breakage Model - FBM, and the Particle Replacement Model – PRM. Such models were calibrated on the basis of the median fracture energy of …
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Modeling the coupled effects of heat transfer. thermochemistry, and kinetics during biomass torrefaction
… for heat transfer limitations present in larger particles. The first component of the present torrefaction model is an analysis of the existing experimental work which results in a detailed thermochemical and grinding energy models. These models enable the prediction of reaction mass, energy, and …
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Multiscale Computational Framework for Analysis and Design of Ultra-High Performance Concrete Structural Components and Systems
… with Ultra-High Performance Concrete (UHPC). The modeling strategy utilizes the Lattice Discrete Particle Model (LDPM) to represent UHPC material and structural member response, and extends a structural-level triaxial continuum constitutive law to account for the addition of discrete fibers. The …
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Probing structure-property relationships of calcium hydroxyapatite defluoridation to enhance performance
… hydroxyapatite (HAP, Ca5(PO4)3X, where X=OH) nanoparticles (NPs) formed into pellets and used in fixed-bed column reactors are among a handful of technologies recommended by the WHO for low income contexts. In the environmental engineering discipline, HAP has historically been considered a F- …
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