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 17 of 17 for “"Non-equilibrium effects"”.
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Translational Non-Equilibrium Effects in Reactive Dynamics of Detonations
… with transverse shocks. The role of out-of-equilibrium phenomena in these waves remains unclear despite extensive research on the underlying physics. On the small scales, translational non-equilibrium associated with shocks, as postulated by Zel’dovich, may significantly affect the …
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Non-equilibrium effects on in-tube condensation from superheated vapor
… as long as the refrigerant flow is in thermal equilibrium. However, thermal equilibrium almost never happens during a heat transfer process due to the temperature gradient required by the Newton’s cooling law. During a condensation process, the vapor refrigerant has the highest temperature at …
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Minimal stochastic models for non-equilibrium effects and atomic-scale friction phenomena
Diese Dissertation behandelt minimale stochastische Modelle im Überlappungsbereich von atomarer Reibung und Nichtgleichgewichts-Phänomenen der Brown'schen Molekularbewegung. Der thematische Schwerpunkt liegt dabei auf der Untersuchung von dynamischen Effekten in Zwei- und Mehrteilchen-Systemen, in …
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Modeling of non-equilibrium effects on a double wedge configuration in hypersonic flows
… flows characterized by thermal and chemical non-equilibrium phenomena. The accurate modeling of non-equilibrium effects relies on knowledge of reaction rate constants and relaxation parameters, often extrapolated outside their range of applicability. The objective of this thesis is the …
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Machine learning approach to model the microstructure and strength of nickel superalloys
… in speed, retrainability, incorporation of non-equilibrium effects, and the effective inclusion of computational data. By incorporating domain knowledge, it is shown that such GPR models can extrapolate into regions of composition space which include elements unseen during the training …
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Modeling of high enthalpy flows for hypersonic re-entry and ground-based arc-jet testing
… Navier-Stokes equations in thermo-chemical non-equilibrium with Spalart-Allmaras turbulence closure is outlined, along with models for thermodynamics, chemical kinetics, transport properties, and the applied electric field. The electric field and the Joule heating term are computed using a …
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A Computational Model for Two-Phase Ejector Flow
… the ejector. The poorly understood two-phase, non-equilibrium flow occuring in the ejector complicates this task. The CFD code is based on a parabolic two-fluid model. The applicable two-phase flow conservation equations are presented. Also described are the interfacial interaction terms, …
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Flooding and non-equilibrium in counter-current flows with reference to pressurised water reactors
… area varied with pressure. Whilst this phenomenon was not directly related to the PWR refill problem, it was an interesting feature in its own right. Use was made of previous experimental results for steam-water mixtures on similar test sections, in conjunction with the present air-water data, …
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Effective kinetic description of non-equilibrium dynamics in small and large collision systems
… with few produced particles may require a non-equilibrium description of the dynamics. In this work we describe equilibrium and non-equilibrium effects in hadronic collisions ranging from small to large systems within model descriptions based on kinetic theory and compare to hydrodynamics. …
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Spin-mixing and transport through superconducting interlayers in ferromagnetic Josephson junctions
… spin-orbit coupling. The research focuses on equilibrium spin-transport through intermediary superconducting regions for which experimental and theoretical studies are limited. The behaviour of singlet and triplet pair components in Nb/Cr/Fe/Nb/Fe/Cr/Nb Josephson devices demonstrates that …
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Optimization of Hypersonic Airbreathing Propulsion Systems through Mixed Analysis Methods
… models were created, the first of which uses equilibrium chemistry to estimate the state of the flow throughout the combustor and nozzle. Going one step further, the second model uses a set of canonical reactors to capture the non-equilibrium effects that may exist in the combustor/nozzle. The …
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Dynamical Aspects of Topological Quantum Systems
… can arise in systems that are driven out of equilibrium or coupled to their surroundings, which are not described by ground state physics. Firstly, we consider systems undergoing unitary time evolution due to some external driving. We show how the entanglement features of the time-dependent …
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Establishing scale inhibitor retention mechanisms in pure adsorption and coupled adsorption/precipitation treatments
… use one mechanistic description or another. The equilibrium adsorption isotherm determines the general nature and extent of the scale inhibitor return process in the low concentration flow regime. However, the additional SI “loading” within the near wellbore formation may be greatly enhanced by …
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Detailed simulations of bubble-cluster dynamics
… incorporates first-order pressure and velocity non-equilibrium effects while preserving interface conditions for equilibrium flows, even within the thin diffused mixture region. The finite-volume numerical solver is also integrated in a multi-resolution Adaptive Mesh Refinement (AMR) framework …
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Reduced-order model framework for thermochemical non-equilibrium hypersonic flows
… is extremely complex and involves many different non-equilibrium physical phenomena occurring on many different time-scales. As a result, work focused on modeling this type of flowfield has been hindered by inaccurate physical and chemical models. For example, the conventional approach to model …
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Multi-scale modeling of laser induced breakdown in non-equilibrium plasmas
… control and ignition of combustible mixtures). A non-equilibrium model for laser-plasma interaction has been developed and validated for the purpose of this study. The computational framework has been, then, used to investigate the plasma kernel dynamics under different ambient conditions (e.g., …
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Strongly correlated quantum fluids and effective thermalization in non-Markovian driven-dissipative photonic systems
… many-body system whenever the interference effects related to the underlying wave nature of its elementary constituents can not be neglected anymore, and a naive classical description in terms of interacting billiard balls fails to catch its most essential features. This interference …