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 32 for “"Chemical reactors"”.
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Nonlinear analysis and control of chemical reactors
… that is useful for modeling and controlling chemical reactors. The motivation for this work originates from a few reports which have demonstrated in the past that the nonlinear spectral method offers a useful mathematical framework for classifying and quantifying nonlinear complexities of …
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Numerical Simulations of Thermo-Fluid Phenomena in Microwave Heated Packed and Fluidized Beds
… fields such as drying, material processing, and chemical reactors. Microwaves offer several advantages over conventional heating methods: 1) microwaves deposit heat directly in the material without convection or radiation, 2) microwave heating is easy and efficient to implement, and 3) microwave …
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Fluidodinamica bifase in condotti elicoidali per applicazioni nucleari
… for air conditioning and refrigeration systems, chemical reactors, and nuclear power plants is due to their heat transfer high efficiency and their compactness. Depending on specific applications of these components, for adequate design purposes, it is important to have a full knowledge of fluid …
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Microfluidic synthesis of colloidal nanomaterials
… the application of classical techniques of chemical reaction engineering to design chemical reactors that cannot be realized easily at the macroscale, and that closely approach theoretical 'idealized' reactor configurations. In addition, the microfluidic format allows precisely controlled …
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Comparative phosphorus removals using modified activated sludge processes
… phosphorus removal efficiencies in biological reactors. 2. Higher mean solids residence times result in higher phosphorus removal efficiencies in strictly chemical reactors. 3. Calcium-phosphate precipitation can occur in continuous flow reactors in a normal activated sludge pH range (7.5-8.5) …
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Characterization and systems integration of microreactors
… to create highly instrumented, micro-scale chemical reactors that bring with them the potential for new analytical capabilities, point-of-use synthesis, and highly parallel screening methods. However, the use of integrated circuit-like reaction devices, such as the MIT thin-film …
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Scalable multiphase microchemical systems for direct fluorination
Microchemical systems or microreactors refer to a new class of continuous reactors that have feature sizes in the submillimeter range. In particular, microfabricated chemical reactors are built using silicon-based photolithographic fabrication techniques that were originally developed to create …
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Fiber optic hydrogen sensing utilizing facet etched palladium nano-apertures
… such as those found in combustion engines or chemical reactors. The first part of this thesis details current work in the field and the need for accurate hydrogen sensors. Next is the background theory, design, and fabrication of the C-shaped aperture, which is used for its high transmission …
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Dynamic reduced order modeling of entrained flow gasifiers
… properties, drying and devolatilization, chemical kinetics, fluid dynamics, heat transfer, pollutant formation, slag behavior and syngas cooling. The ROM employs a reactor network model (RNM) that approximates complex fluid mixing and recirculation using a series of idealized chemical …
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Investigation of new renewable energy-based multigeneration systems for Saudi Arabia
… and 64%, respectively. For all systems, the chemical reactors are modelled using the Aspen Plus, which helps determine the best oxygen-to-biomass fraction in the gasifier as 15% at the turbine inlet temperature of 1500°C for System 1, the optimum methanol synthesis temperature in the range of …
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Design and Modeling of a Novel Direct Carbon Molten Carbonate Fuel Cell with Porous Bed Electrodes
… equations that describe the transport and electrochemical processes taking place in both the anode and cathode and a methodology for solving these equations. Literature correlations from multi-phase packed-bed chemical reactors were used to estimate phase hold-up and mass transfer coefficients. CO …
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Spatio-Temporal Dynamics of Reaction Zones in Catalytic Monolith Reactors
Catalytic monolith reactors are widely used in exhaust after-treatment systems. Unlike traditional chemical reactors which are commonly operated around certain steady-states, monolith reactors are almost always in transient states due to the nature of their applications. In this work, we studied …
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The application of laser measurement techniques to the pneumatic transport of fine particles
… conveyed pneumatically, for example in transport chemical reactors, in drag reducing flows, and in certain heat transfer processes, the particles are generally much larger than the usual seeding particles, and thus do not travel at the same velocity as the carrier fluid. During this investigation, …
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Development of a selective substrate metallization process via electorless gel plating
… which immerses the component to be coated into a chemical medium. The plating baths usually operate at temperature greater than 70°C and a pH greater than 12. Alumina is stable in this environment but AlN corrodes. An electroless gold gel plating process was developed which selectively plates …
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Oscillatory Flow Mechanism for Enhanced Heat Transfer
… for this research such as removing heat from chemical reactors, electrical devices and other enclosed environments such as submarines, underground facilities and so forth. Many parameters can be varied to maximize the convective heat transfer. These parameters include the amplitude and …
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Collaborative Simulation of Reacting Flow and Controller in Chemical Looping Systems
As chemical reactors and industrial processes become more complex and diverse, process controllers are increasingly required to optimise system performance and ensure stable operation. This is particularly true in energy-intensive industries, where multiphase reactive systems are highly dynamic and …
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Dynamics of quasi-two-dimensional turbulent jets
… turbulent jets is relevant to chemical reactors, the coking process in oil refinement, as well as rivers flowing into lakes or oceans. In the event of a spillage of pollutants into a river, it is critical to understand how these agents disperse with the flow in order to assess …
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On the Chemistry of Molecules Containing Silicon, Phosphorus, and Sulfur in the Interstellar Medium
… at providing new experimental data for astrochemical modeling and probing the fundamental chemistry underlying the phenomena investigated. The core of this thesis is the study of the reactivity in the gas phase of ions related to the third-period elements Si+, P+, and H2CS+, for which the …
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Modelling and Control of Chemical Processes using Local Linear Model Networks
… made fast progress in numerous fields, such as chemical process engineering. The modelling and control may face some challenges as the procedures applied to chemical reactors and processes are nonlinear. Therefore, the aim of this research is to overcome these challenges by applying a local …
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