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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 70 for “"Conservation Equations"”.
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Computer-aided optimal design for laminar and turbulent fluid-thermal systems
… to investigate the momentum-, mass-, and energy-conservation equations for strongly coupled flow problems. Then the design sensitivities of the system response are computed and used in a numerical optimization algorithm to minimize pressure drop in flow through contractions. Both laminar and …
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Particle Diffusivity in Fully Developed Turbulent Pipe Flow of Dilute Suspensions
… relations needed for the solution of conservation equations governing multiphase flow. Particle diffusivity is also a key parameter in the modeling and scaling of systems involving multiphase flow. The present investigation is concerned with the diffusivity of small particles in …
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A theoretical plasma physics model of the plasmatron
… and reduce emissions. Solutions of the conservation equations for the arc yield temperature, pressure and velocity profiles for arcs with 0.2-0.8 A currents. Acquired knowledge was used to predict arc radius and power delivered by the arc as a function of current.
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A continental shelf bottom boundary layer model : the effects of waves, currents, and a movable bed
… continental shelf is presented. The governing equations are developed for a stratified, turbulent Ekman layer in a combined wave and current flow over a moveable sediment bed. An eddy diffusivity closure scheme that includes the effect of suspended sediment, temperature, and salinity induced …
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Estocagem por estratificação térmica de líquido em reservatório
… enormous applicability; Considering the energy conservation equations, it is proposed a transient one-dimensional semi-empirical model to the storage system, describing the temperature profile history of.the liquid and the vessel wall, during the normal operating conditions (charging, …
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Estudo analítico da convecção natural junto a uma placa inclinada para números de Prandtl baixos
… of the additional terms considered in the conservation equations are investigated separately. The perturbation equations were solved Prandtl numbers 0.733 and 0.03 and inclination angles and 60. Velocity and temperature profiles are compared to numerically for of the experimental results …
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An Experimental Investigation of the Injection Process in a Direct-Injected Natural Gas Engine Using PLIF and CARS
A set of scaling factors derived from the conservation equations effectively collapsed fuel jet penetration measurements under both motoring and stationary piston conditions. The scaling factors are based on the pseudo diameter of the jet, which is the diameter of an equivalent sonic jet expanded …
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Experimental and analytical investigation for diesel smoke elimination
… was conducted by solving the mass, momentum conservation equations, the k-$\varepsilon$ turbulence model, and the electric as well as the particle diffusion governing equations.
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Development of stable operator splitting numerical algorithms for phase-field modeling and surface diffusion applications
… phase field models. Individual terms of the conservation equations were approached by different methods using operator splitting techniques found in previous literature. In addition, dewetting of gold films due to surface diffusion was modeled to present the extendability and efficiency of …
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A Numerical Vortex Approach To Aerodynamic Modeling of SUAV/VTOL Aircraft
… uses blade element theory combined with momentum conservation equations. This model is expected to be of significant importance in the design of tail-sitter vertical take-off and landing (VTOL) aircraft, where the propeller slipstream is the primary source of air flow past the wings in some flight …
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A stage-by-stage post-stall compression system modeling technique: methodology, validation, and application
… a numerical technique to solve the nonlinear conservation equations of mass, momentum, and energy. Inputs for blade forces and shaft work are provided by a set of quasi-steady stage characteristics modified by a first order lagging equation to simulate dynamic stage characteristics. The model …
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An Improvement of Convection Fidelity in Euler Calculations
… procedure was developed to solve the Euler equations for steady, compressible, rotational, inviscid flows. The approach is aimed to achieve real inviscid solutions in Euler calculations by eliminating the numerical diffusion inherent in conventional approaches. In conventional approaches …
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One-Dimensional, Finite-Rate Model for Gas-Turbine Combustors
… is the one-dimensional, integral form of the conservation equations for multi-species, non-equilibrium, reacting mixtures. Special procedures were devised for the flow-division of the inlet flow into primary- and annular-flows, for both straight- and reverse-flow combustors. This allows the …
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Comparisons of computational methods to represent electron transport in nonequilibrium plasma devices
… the two-dimensional, time dependent model, fluid equations are solved to obtain the electron and ion densities, and Poisson's equation is solved for the electric potential. These equations can be solved using the local field approximation (LFA), employing conservation equations for the bulk …
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Modeling of solid oxide fuel cells
… Research Initiative. Further, we formulate the conservation equations in the unsteady form, allowing for analyzing the response of the MEA to imposed dynamics. As for the electrochemistry model, we additionally analyzed all the possibilities of the rate-limiting reaction and proposed …
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Analysis of the injection of a heated, turbulent jet into a moving mainstream, with emphasis on a thermal discharge in a waterway
… cross sectional area during the solution of the conservation equations (a number of previous studies assume a specific growth for the area). Realistic estimates of temperature in the effluent were acquired by accounting for heat losses in the jet flow due to forced convection and to entrainment …
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Compressible Flow Analysis of Thrust Augmenting Ejectors
… or detailed models based on the Navier -Stokes Equations and the theory of turbulent jets. The control volume approach uses integrated forms of the conservation equations of mass, momentum and energy. It is chosen in the first part of the study since it affords the best vehicle for the …
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Modeling the coupled effects of heat transfer. thermochemistry, and kinetics during biomass torrefaction
… one-dimensional single particle model where conservation equations are solved by a custom code in MATLAB. The effects of coupled thermochemical, kinetic, and heat transfer phenomena are analyzed. A comparison of two classes of torrefaction reactors (fixed/moving bed and fluidized bed) is made …
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Numerical Analysis of the Melt Pool Kinetics in Selective Laser Melting Based Additive Manufacturing of M g2Si Thermoelectric Powders
… (CFD)-based techniques were employed to solve conservation equations, enabling a detailed understanding of thermofluid dynamics, including the temperature evolution and the con- vection currents of the liquid melt within the molten pool. This approach was critical for optimizing processing …
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A study of magnetoplasmadynamic effects in turbulent supersonic flows with application to detonation and explosion
… medium. While the magnetohydrodynamic (MHD) equations share many of the mathematical characteristics of the hydrodynamic equations, numerical methods developed for the conservation equations of a magnetized plasma are complicated by the requirement that the magnetic field must be divergent …
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