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 46 for “"reactor model"”.
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Development of a microchannel reactor model
… an on-board fuel processing system. Microchannel reactors have reduced mass and heat transfer limitations and are able to exploit fast intrinsic kinetics. Also, their high surface area to volume ratio reduces their size for a constant throughput, increasing their potential for miniaturised …
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Development of a computationally efficient model for the control of Ziegler-Natta catalysed industrial production of high density polyethylene
… catalysts. During grade transitions, when reactor conditions are manipulated to change polymer properties, significant quantities of off-specification product result. Implementing a model-predictive controller based on a dynamic reactor model may allow for minimising losses during …
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On-line economic optimization of a chemical reactor
… for a continuous flow stirred tank chemical reactor is designed, simulated, and installed on a pilot scale reactor. The control scheme utilizes a reaction and reactor model to predict on-line the economic optimum of a reactant concentration. In this manner the control system manipulates the …
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Modeling, Simulation, and Optimization of an Electroorganic Process Flowsheet
… for an electroorganic process flowsheet. A model of an electrochemical reactor based upon fundamental principles was developed for the electrolytic oxidation of secondary butyl alcohol to methyl ethyl ketone in an aqueous sulfuric acid solution. Experimental measurements were performed to …
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FAST-PYROLYSIS OF BIOMASS RELATED MODEL COMPOUNDS: A NOVEL APPROACH TO EXPERIMENTAL STUDY AND MODELING
… and validation of analytical methods and reactors, 2--the utilization of these methods to study pyrolysis of biomass and related models, 3--use of available biomass conversion pathways to propose potential integration with the existing fuel and chemicals markets, and 4--a proposed kinetic …
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Hybrid Dynamic Modelling of Engine Emissions on Multi-Physics Simulation Platform. A Framework Combining Dynamic and Statistical Modelling to Develop Surrogate Models of System of Internal Combustion Engine for Emission Modelling
The data-driven models used for the design of powertrain controllers are typically based on the data obtained from steady-state experiments. However, they are only valid under stable conditions and do not provide any information on the dynamic behaviour of the system. In order to capture this …
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Hybrid Dynamic Modelling of Engine Emissions on Multi-Physics Simulation Platform. A Framework Combining Dynamic and Statistical Modelling to Develop Surrogate Models of System of Internal Combustion Engine for Emission Modelling
The data-driven models used for the design of powertrain controllers are typically based on the data obtained from steady-state experiments. However, they are only valid under stable conditions and do not provide any information on the dynamic behaviour of the system. In order to capture this …
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Parameter optimization of the nonlinear and linear xenon oscillation models
… of this work was to develop a linear two-point reactor model from an existing nonlinear model and determine optimum parameters for both models in comparison to actual plant data. The importance of keeping the nonlinearity to accurately describe the xenon oscillation problem was also examined. …
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Transport-theory-equivalent diffusion coefficients for node-homogenized neutron diffusion problems in CANDU lattices
Calculation of the neutron flux in a nuclear reactor core is ideally performed by solving the neutron transport equation for a detailed-geometry model using several tens of energy groups. However, performing such detailed calculations for an entire core is prohibitively expensive from a …
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Neutron flux characterization of the Kansas State University TRIGA Mark II’s Northeast Beam Port
… the Beam Port geometry was added to the existing reactor model. Then the in-core fission rates were tallied using MCNP to provide a source term for the beam transport. The program ADVANTG was used for automated generation of weight windows to accelerate the convergence of tallies in the beam port …
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Studio e sviluppo di un motore a 2 tempi diesel veloce di nuova concezione per applicazioni automobilistiche
… mechanism for diesel oil surrogate and the modeling of turbulence/chemistry interaction through the PaSR (Partially Stirred Reactor) model. A four stroke automobile Diesel engine featuring a very close bore size is taken as a reference, for both the numerical models calibration and for a …
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IN-CORE MEASUREMENT OF DELAYED-NEUTRON PARAMETERS.
… neutron generation time applicable for a given reactor system. The method uses a least-squares fitting technique to simultaneously fit a series of transient responses produced by step changes (or rapid ramps) in reactivity of arbitrary size. The function which is least-squares fit is the exact …
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Exergetic Analysis Of Hydrogen Combustion Involving Electronically Excited Species
… to enhance combustion. PAC research involves modeling reaction mechanisms and chemical kinetics. Exergy analysis of combustion devices focuses on combustion irreversibility, including mixing, internal heat transfer, and oxidation. This novel research project merges these two branches of …
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Observer-based fault detection for nuclear reactors
This is a study of fault detection for nuclear reactor systems. Basic concepts are derived from fundamental theories on system observers. Different types of fault- actuator fault, sensor fault, and system dynamics fault can be detected and localized by studying the asymptotic response of an error …
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CFD Simulations of Chemical Looping Combustion in a Packed Bed and a Bubbling Bed Fuel Reactor
… the CFD simulations of a CLC packed bed fuel reactor with ilmenite and carbon monoxide are conducted and compared with the experiments of Galucci; the simulations are performed for hot flow with chemical reactions simulating the exact experimental conditions. The previous simulations for this …
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Multi-Physics Engine Simulation Framework for Drive Cycle Emissions Prediction. Development and Validation of a Framework for Transient Drive Cycle NOx Prediction Modelling based on Combining 1-D and 0-D Internal Combustion Engine Simulation and Statistical Meta-Modelling
… on a coupled virtual 2.0 litre Diesel engine model (GT- Suite 1-D air path model) and in-cylinder combustion model (CMCL Stochastic Reactor Model (SRM) Engine Suite). A set of steady state and drive cycle physical measurements obtained from physical engine testing on a dynamometer was …
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Kinetics and Reaction Engineering Aspects of Syngas Production by the Heterogeneously Catalysed Reverse Water Gas Shift Reaction
… were performed in a down-flow fixed bed quartz reactor at atmospheric pressure. The reverse water gas shift (RWGS) reaction was examined in both the forward and reverse direction. In addition to these experiments, the consecutive reaction of CO to CH4 was also studied. The results indicate that …
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Experimental and modeling studies of formation of products of incomplete combustion and chlorocarbon incineration
… combustion reaction mechanism from literature. Modeling of combustion process has shown different pathways of benzene formation for first (perfectly stirred) and the second (plug flow) zones of the combustor with residence time 0.007 and 0.029 sec respectively. Destruction efficiency of …
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CO and Hydrocarbon Oxidation on PD/Ceria-Zirconia/Alumina Three-Way Catalysts
… H2O, and N2. The oxidation behavior of CO and model hydrocarbons (propylene, acetylene, and ethylene) and performance of model TWCs is investigated in this dissertation to systematically evaluate trends such as self- and mutual inhibition within reaction and catalytic systems with the intent of …
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Multi-Physics Engine Simulation Framework for Drive Cycle Emissions Prediction. Development and Validation of a Framework for Transient Drive Cycle NOx Prediction Modelling based on Combining 1-D and 0-D Internal Combustion Engine Simulation and Statistical Meta-Modelling
… on a coupled virtual 2.0 litre Diesel engine model (GT- Suite 1-D air path model) and in-cylinder combustion model (CMCL Stochastic Reactor Model (SRM) Engine Suite). A set of steady state and drive cycle physical measurements obtained from physical engine testing on a dynamometer was …
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