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 42 for “"flux model"”.
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Two-Phase Flow Dynamics by a Five-Equation Drift Flux Model
Made available in DSpace on 2017-07-06T18:49:00Z (GMT). No. of bitstreams: 3 Kim_Chulsoo_MS.pdf: 27877982 bytes, checksum: d3e665bc705fec3b391db5aa2f76cd57 (MD5) Kim_Chulsoo_MS_ABS.pdf: 402696 bytes, checksum: 4073dbfb74579e93909191cb257c0985 (MD5) license.txt: 4813 bytes, checksum: …
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Development of a cell flux model and its application to nitrogen fixers
.Quantifying and modeling the macroscopic ecological and biogeochemical effects of cellular physiology and metabolism is a challenge: most quantitative "systems biology" models are focused at the metabolic and individual scale. In this study, we develop and apply a simplified metabolic model at the …
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Higher order approximation for combined mode heat transfer in building insulations
… the approximate solution available is the two-flux model. The two-flux model does not give good results for transient, combined mode heat transfer, through an absorbing, emitting, and anisotropically scattering medium. In this thesis a higher order approximate solution has been developed. It is …
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Applications of Neutrino Physics
… oscillation experiments on reactor neutrino flux model. We fit the largest reactor neutrino flux model error, weak magnetism, using data from experiments. We use reactor burn-up simulations in combination with a reactor neutrino flux model to demonstrate the capability of a neutrino detector …
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Linear and Nonlinear Stability Analyses of Density-Wave Oscillations in Heated Channels
… The two-phase flow is represented by the drift flux model. A constant characteristic velocity v$\sbsp{\rm o}{\*}$ is used to make the set of equations dimensionless to ensure the mutual independence of the dimensionless variables and parameters.
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Experimental investigations of oxygen-separating ion transport membranes for clean fuel synthesis
… low oxygen (sweep) surfaces influence the oxygen flux: these experimental measurements have not been available until now. A novel ITM research reactor has thus been developed which can directly sample gases at the membrane surface at high temperature flux conditions. This ITM reactor has been …
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Uncertainty Quantification and Accuracy Improvement of the Double-Sensor Conductivity Probe for Two-Phase Flow Measurement
… are analyzed: that of measurands, of the model input parameters, and of the mathematical models. A Monte Carlo uncertainty evaluation framework closely simulating the actual measuring process is developed to link various uncertainty sources to the time-averaged two-phase flow quantities …
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Modelling Transient Air-water Flows in Civil and Environmental Engineering
… First, I show that any mathematical model for free surface flows can be extended to pressurized flows. Second, the multiphase drift‐flux model is proven an adequate alternative to Navier‐ Stokes equations in civil and environmental engineering. These propositions underpin the …
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Hydrodynamics and gas holdup in a cocurrent air-water-fiber bubble column
… bubble column are identified based on the drift-flux model. Three gas flow regimes (i.e., dispersed bubble, vortical-spiral, and turbulent flow) are identified. When fiber mass fraction is higher than a certain value (which is a function of fiber type), the dispersed bubble flow regime disappears …
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The simulation of fire growth and spread within enclosures using an integrated CFD fire spread model
… relatively simple but reasonable engineering models within a CFD software framework to simulate fire in a compartment and fire growth and propagation in enclosures in which solid combustibles are involved through wall or ceiling linings. Gas phase combustion, radiation and solid fuel …
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Implications for Restoration: Effects of Riparian Vegetation and Shade on Temperature Gradients in Lower Gold Creek, Southwest Montana
… where temperature loggers were placed. A heat flux model developed by USGS was used, called the Stream Segment Temperature Model, to help determine the strength of each field component and heat fluxes on stream temperature down the length of each reach. The model was calibrated with measured …
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Implications for Restoration: Effects of Riparian Vegetation and Shade on Temperature Gradients in Lower Gold Creek, Southwest Montana
… where temperature loggers were placed. A heat flux model developed by USGS was used, called the Stream Segment Temperature Model, to help determine the strength of each field component and heat fluxes on stream temperature down the length of each reach. The model was calibrated with measured …
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Resistance-in-series modeling in high-shear rotary ultrafiltration
… of the resistance-in-series (RIS) permeate flux model to predict pressure-flux data collected in the HSR-UF of a synthetic MW fluid. Experiments were conducted using a pilot-scale HSR-UF system with a 0.11 mum average-pore size membrane at a single temperature operating temperature of …
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A Framework for the Analysis and Design of Vector Controllers for Induction Machines
… than revolutionary. The traditional current-flux model is partially responsible for this, because the control objectives (torque and flux magnitude) are implicit to the model. This work makes contributions to the understanding and performance improvement of induction machine drive systems by …
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Finite Ion Temperature, Plasma Rotation, and Electromagnetic Effects on Plasma Acceleration in the Magnetic Mirror Geometry
… The plasma dynamics was studied using a quasi-2D model in the paraxial approximation in which the effects of the radial magnetic field Br were considered up to first order. In this approximation, the general two-dimensional nonlinear equations for the axisymmetric equilibria with flow are reduced …
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Development of a quasi-dimensional diesel engine simulation for energy and availability analysis
A quasi-dimensional multi-zone combustion model and a radiation heat transfer model are developed for the study of turbocharged diesel engine performance and energy and availability balance. The quasi-dimensional multi-zone combustion model is based on the air and fuel mixing process with a …
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Two phase problems and two phase flow
… 1 of this thesis a two-dimensional mathematical model is used to investigate the circulation in a gas-bubble agitation system of a cylindrical vessel for the case of an orifice located at the centre of the base. The two-phase (liquid/gas) region is assumed to be confined to a cone-shaped region …
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Abordagem algébrico-diferencial na simulação unidimensional do escoamento bifásico em dutos
… to equally accurate two-phase flow mathematical models. A literature survey has shown that this problem has been currently addressed by means of one-dimensional simulations based predominantly on Two-Fluid and Drift-Flux Models, although simpler methods which employ the assumption of homogeneous …
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Enhanced coalescence-induced jumping droplet departure
… we developed a condensation critical heat flux model to show that modest jumping speed enhancements of 50% using multi-drop jumping can enhance performance by up to 40%.
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