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 41 for “"Entropy Production"”.
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Fluid transport and entropy production in electrochemical and microchannel droplet flows
… This thesis investigates the efficient production of hydrogen from the electrolysis of copper chloride, by predicting entropy production as a result of diffusive mass transfer. Also, this thesis investigates the possibility of producing electrical energy from waste heat produced by …
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Orthogonal Transformations of the Onsager Phenomenological Equations and Minimum Entropy Production
… processes are called reversible processes and no entropy is produced when systems undergo such processes. There is no attempt to describe phenomena which occur in systems which acre not in states of thermodynamic equilibrium. Thus, equilibrium thermodynamics cannot provide the description of …
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The principle of maximum entropy production in a simple model of a convection cell
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1992.
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A study of well-balanced finite volume methods and refinement indicators for the shallow water equations
… accurate solutions. We consider the numerical entropy production and weak local residuals as refinement indicators. Regarding the numerical entropy production, our work is the first to implement the numerical entropy production as a refinement indicator into adaptive finite volume methods used …
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A study of well-balanced finite volume methods and refinement indicators for the shallow water equations
… accurate solutions. We consider the numerical entropy production and weak local residuals as refinement indicators. Regarding the numerical entropy production, our work is the first to implement the numerical entropy production as a refinement indicator into adaptive finite volume methods used …
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Stochastic dynamics and fluctuation theorems in Brownian, feedback-controlled, and optical cavity systems
… and second-law-like inequalities are derived for entropy production associated with both the system variable and the feedback parameter, and these results are interpreted in terms of information flow. A solvable harmonic feedback model is subsequently analyzed and mapped to an equivalent …
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Effect of BLI-Type Inlet Distortion on Turbofan Engine Performance
… resulted in a 24% increase in mass-averaged entropy production along the entire fan flow path compared to the non-distorted test. A mass-averaged fan flow path efficiency was also calculated assuming an isentropic process as ideal. The non-distorted fan flow path efficiency was computed to be …
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Application of Irreversible Thermodynamics to Biological Membrane Transport Phenomena
… form we obtain a new relation between the entropy production and the state parameters (flows or forces) of the system. Active transport across a biological membrane can be studied in terms of the translation of the origin of the system in this new picture.
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Quantum technologies with superconducting artificial atoms
… theorems is demonstrated. Moreover, the entropy production is defined as a witness of irreversibility and trajectory with a negative entropy production are shown, the mean entropy production being non-negative as required by the second law.
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Fluctuation Relations for Stochastic Systems far from Equilibrium
… media enables the direct analysis of work and entropy distributions. These probability distributions are the result of a large number of repetitions of the same experiment. Due to the small scale of these experiments, the outcome can vary significantly from one realization to the next. Strong …
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Entropy generation minimization of a heat and mass exchanger for use in a humidification-dehumidification desalination system
The physical mechanisms of entropy generation in a condenser with high fractions of non-condensable gases are examined using control volume, scaling, and boundary layer techniques, with the aim of defining a criterion for minimum entropy generation rate that is useful in engineering analyses. This …
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Coupled dynamics of above- and below-ground interactions in the critical zone
… carbon, nitrogen, energy, and thermodynamic entropy fluxes. In addition, these processes are analyzed within a multi-species framework where different plant species coexist and share resources. Coexistence of species originates competitive and mutualistic interactions that impact the fluxes …
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Modeling the Non-Equilibrium Behavior of Chemically Reactive Atomistic Level Systems Using Steepest-Entropy-Ascent Quantum Thermodynamics
… (IQT) and its mathematical framework steepest-entropy-ascent quantum thermodynamics (SEA-QT) to predict the reaction kinetics at atomistic levels of chemically reactive systems in the non-equilibrium realm. IQT has emerged over the last three decades as the theory that not only unifies two of …
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An Improvement of Convection Fidelity in Euler Calculations
… contaminated by numerical diffusion and false entropy production. This numerical diffusion is also responsible for the solution dependency on the grids used and the solution reliability of the Navier-Stokes solutions with physical viscosity terms.
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On the irreversibility of collective motion in polar active matter
… stochastic thermodynamics, (stochastic) entropy production, time-reversal symmetry, the principle of detailed balance, Sekimoto’s stochastic energetics and spherical diffusions, with example applications. • Chapter 3 – Review of the Vicsek model (VM), the ‘continuous-time Vicsek model’ …
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A method for detecting nonequilibrium dynamics in active matter
… Divergence (KLD), also known as relative entropy. We estimate the KLD from a stationary time series using a k-nearest neighbors estimator, comparing the time-forwards process to the time-reversed process Using time series data of probe particles embedded in the actin cortex, we establish a …
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Some Problems in Stochastic Dynamics and Statistical Analysis of Single-Cell Biology of Cancer
… quantities, so as to explain the origin of entropy production.
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Differential and Integral Invariance of the Relativistic Vlasov-Boltzmann Equation and the Associated Invariant Variational Problem
… energy density, linear and angular momentum, and entropy production, appropriate for the description of non-ideal relativistic magnetohydrodynamics are obtained from moments of the relativistic kinetic equation.
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Phase-field simulation of freezing water droplet
… are designed such that the non-negative entropy production is guaranteed. These equations are then solved by finite-element methods using the open-source deal.ii library. Our model reproduces the Gibbs-Thomson and Clausius-Clapeyron equations, which establish the dependence of the melting …
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Impact of unsteady flow processes on the performance of a high speed axial flow compressor
… of axial blade row spacing on the level of entropy generation and the flow mechanisms that affect stage performance. The rotor shock waves that impinge on the upstream blade row result in shed vortices that convect downstream through the rotor. At the reduced axial spacing, vortices with …
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