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 29 for “"Reactive flow"”.
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Reactive flow visualization through high-speed optical laser diagnostics
… laser diagnostics to visualize: 1) The turbulent flow field with particle image velocimetry (PIV); and 2) the distribution of combustion radicals, by planar laser-induced fluorescence (PLIF). This allows for the visualization of the flame surface behavior, while at the same time linking it to …
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Study of reactive flow, ground deformation and real-time tomography with applications on CO₂ sequestration
… Experiments and a new computational model on the reactive flow of carbonic acid in limestone, an assessment of the surface uplift owing to sequestration of CO₂ in a carbonate saline aquifer, and a validation of a new, real-time, tomography method that monitors the velocity change resulting from …
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Numerical study of the reactive flow in a two-stream, coaxial-jet, axisymmetric bluff-body combustor
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Developing NMR/MRI Techniques for Characterisation of Reactive Transport in Porous Media
Reactive flow in porous media is a complex transport phenomenon which involves the simultaneous flow and reaction of a fluid in a porous medium and plays a critical role in improving our understanding of carbon sequestration. When CO<sub>2</sub> is introduced into a storage site, which might be a …
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The numerical solution of reacting flow problems
… technique for solving mathematical models of reactive flow. Two main issues of concern when solving these problems are large computational costs and numerical instabilities and inaccuracies. Over the past decades, many numerical techniques have been suggested for the solution of reacting flow …
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Transient Computational Fluid Dynamic Modeling of Baffled Tube Ram Accelerator
… operating characteristics in inert and reactive mixtures. The minimum entrance Mach number that allowed supersonic projectile transit through a baffled tube filled with inert gas and the thrust generated in reactive flow were examined. The primary parameters considered were …
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Parallel Multigrid Method for Adaptive Finite Elements with Application to 3D Flow Problems
… consideration arise from chemically reacting flows. A focal point is the analysis of a finite element discretization with stabilized finite elements of degree two. Aspects of error estimation, solution techniques and mesh adaptivity are discussed with regard to the Navier-Stokes equations. …
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Adaptive Finite Element Methods for Parameter Identification Problems
… of chemical models in multidimensional reactive flow problems.
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Malicious data detection in state estimation leveraging system losses & estimation of perturbed parameters
… quantities to attacks. We compare real and reactive flow and injection measurements as potential indicators of attack. The use of parameter estimation as a means of detecting attack is also investigated. For this the state vector is augmented with known system parameters, allowing both to be …
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Adaptive Finite Element Computation of Chemical Flow Reactors
The main interest in the simulation of flow reactors is the comprehension of the complex interplay between flow, mixing processes and reaction processes. To describe the chemical and physical processes taking place in reactive flows, many chemical species are to be considered with often a few …
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Study of geometry effects on local corrosion rates for Lbe loop
… local corrosion phenomenon. A simple study on reactive flow was carried out by using STAR-CD + CHEMKIN, which is designed for solving reactions both in flow and on surface. In addition, a self-developed code using the finite difference method was employed to reveal how mass transfer is affected …
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Dynamic mesh adaption for supersonic combustion waves modeled with detailed reaction mechanisms
… to resolve the <br>disparate physical scales of reactive flow problems. <br>In our numerical scheme, we combine the dynamic mesh adaption with <br>an explicit as well as implicit upwind finite volume scheme, <br>time scale splitting, adaptive local time stepping, and source term <br>integration …
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Gaseous Reactive Flows Around Catalytically Combusting Micro-Wires
The reactive flow around catalytically coated cylinders was investigated experimentally in the regime of Reynolds and Peclet numbers that are relevant to small-scale power generation. Methane and propane combustion was established on the surface of the catalyst by placing a small-diameter wire in …
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On the simulation and modeling for the reaction mechanism and solid state detonation phenomena in non-conventional explosives
… for the simulation of 1D hydrodynamic model for reactive flow with general EOS adjacent to a vacuum interface. We connected a series of numerical methods, including approximate Riemann solver, splitting method, higher-order interpolation and vacuum tracking method combined with the general …
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Ghost granophyre: A new texture with implications for plagiogranite differentiation and Ti-in-Quartz thermometry
… new model for plagiogranite differentiation via reactive flow of recently described low temperature silicate liquids which span the magmatic-hydrothermal transition, as well as a way to make granophyre without the involvement of a silicate melt. These findings expand the definition of the term …
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Chemical and Thermochemical Wave Behavior in Multiphase Fluid Flow Through Permeable Media: Wave-Wave Interactions
The flow of reactive fluids through permeable media creates regions of constant composition for purely reactive flow. These regions are separated by waves, which mark the change in composition from one region to the next. We develop a theory which elucidates the interactions of these chemical waves …
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Physics-informed neural surrogates for next-generation aerothermochemical modeling
… fundamental physical process in a wide range of reactive flow environments, spanning planetary entry and astrophysical flows to plasma-assisted combustion and flow control. State-to-state (StS) collisional–radiative (CR) models provide the highest level of physical fidelity by explicitly …
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Development of high-speed laser diagnostics for the study of advanced propulsion systems
… propulsion systems involves highly turbulent reactive flow conditions, often beyond the limits of our physicochemical understanding. It is a challenge to produce reliable combustion as localized extinction and instabilities are highly transient in nature. It is in this effort that the …
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Three Dimensional Laser Diagnostics for Turbulent Flows and Flames
… and practical applications, turbulent flows and flames have been under extensive and intensive research for a long time. Turbulent flows and flames of interests to practice inherently have three-dimensional (3D) spatial structures, and therefore diagnostic techniques that can …
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Structure-Preserving High Performance Computational Methods for Transport in Porous Media
… need for improving the performance of subsurface flow and transport simulations has become an area of active research. Two of the most well known numerical deficiencies that the pop- ular formulations and existing simulation packages suffer from are the inability to meet the non-negative …
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