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 55 for “"flow profiles"”.
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Shape based classification and functional forecast of traffic flow profiles
… dissertation proposes a methodology for traffic flow pattern analysis, its validation, and forecasting. The shape of the daily traffic flows are directly related to the commuter’s traffic behavior which merit analysis based on their shape characteristics. As a departure from the traditional …
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New Methodology for the Estimation of StreamVane Design Flow Profiles
… which is considered a type of non-uniform inflow inlet distortion, is characterized by the presence of swirling flow in an inlet. The presence of swirling flow entering an engine can affect the compression systems performance and operability, therefore it is an area of current research. A …
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Smooth Flow Control for On-Chip Pneumatic Micropumps
… possible, it is necessary to generate the same flow profiles found in vitro. This thesis presents the development, implementation, testing, and iterative improvement of both hardware and software that composes a flow control system that produces smooth flow for on-chip pneumatic micropumps. By …
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Characterization of Pressure-Driven and Electro-Kinetically Driven Flow in a Micro-Fluidic Chip Using Particle Imaging Velocimetry
<p>The flow profiles of pressure-driven and electro-kinetic driven flows were compared for a microfluidic chip. It was found that the pressure-driven flow had a parabolic profile while the electro-kinetic flow had a plug shaped flow profile. The measured velocities were similar to those determined …
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Effect of surface imperfections on the stability of compressible laminar boundary layers
… to the Navier-Stokes equations both for the mean flow profiles and for the stability characteristics. The instabilities of flows around smooth forward and backward facing steps are investigated. Results presented include the effect of computational grid refinement, geometrical parametres such as …
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3-DIMENSIONAL NUMERICAL AND EXPERIMENTAL STUDIES TO MODEL ARTIFICIAL HEART VALVES HEMODYNAMICS
… characterization of the artificial heart valves flow fields is a crucial step to evaluate the performances on improving heart valve engineering. With the advancement of Computational Fluid Dynamics, we are able to study the complex hemodynamics in details such as stagnation, recirculation zones …
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An incompressible three-dimensional turbulent boundary layer on the floor of a recurving rectangular channel
… on the applicability of these to predict cross flow profiles when skewing existed in any single profile. A recurving or s-shaped rectangular channel was used to experimentally investigate the possible existence of such a turbulent boundary layer flow. The time average velocity profiles along the …
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Patterns and mechanisms of heat transport in the northern Denver Basin Nebraska, South Dakota and Wyoming
… mechanisms responsible for observed heat flow anomalies in the study area. Measurement of thermal conductivity was conducted for 82 solid core samples and 60 unconsolidated samples from drill cuttings, yielding a harmonic mean thermal conductivity value of 1.52 ± 0.91W m-1 K-1 for the …
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A Comparison of Accounting and Internal Rates of Return for the Firm in A Dynamic Setting
… Internal Rate of Return (WIRR) in a discrete flow model of the firm in some simple dynamic situations. The model parameters are the IRRs, durations, and cash flow profiles of the capital projects which constitute the firm, and the investment growth rate and accounting depreciation methods for …
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Predicting Flow in Firebrand Pile using Pore Network Model
… an in-depth understanding of heat transfer and flow profile within the firebrand pile. Modeling the firebrand pile as a fibrous porous medium, this study identified a porosity-permeability correlation that accurately describes the transport properties of a firebrand pile. The conduction-based …
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Detection Method of Subclinical Atherosclerosis of the Carotid Artery with a Hemodynamics Modeling Approach
… data is needed. Laminar and turbulent flow, dictated by Reynolds number and relative roughness, was modeled through the carotid artery bifurcation to compare shear stress and shear rate. Computer-aided design and fluid flow software were used to model hemodynamics through the carotid …
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Comparison of non-reactive solute transport models for the evaluation of fluid flow in leaching beds
… to the contact efficiency is preferential flow, cited to result in low extraction rates and in extreme cases, heap failure. Preferential flow reveals itself on two scales in drip irrigated heaps, referred to as the bed and solution scale. The bed scale takes a macro view of the heap and …
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Experimental Investigation of Fan Rotor Response to Inlet Swirl Distortion
… engines operating in less than optimal inlet flow conditions. The engine inlet flow profiles predicted from boundary layer ingesting aircraft architectures contain complex distortions that affect the engine operability, durability, efficiency, and performance. One component of these complex …
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An investigation of the impact of redd washout, fine sediment infiltration and variations in water chemistry during egg incubation on juvenile production of Atlantic salmon (Salmo salar L.)
… temperature, fine sediment infiltration, flow rates / flow profiles and artificial redd washout. A river corridor survey (with integrated management plan), and a river channel geology / bed<br/>material abundance survey, provided additional information to the vegetative and physical …
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Axial Evolution of a Sheared-Flow-Stabilized Z Pinch
The Fusion Z-pinch Experiment (FuZE) is a sheared-flow-stabilized Z pinch based on the ZaP and ZaP-HD experiments. The FuZE device generates neutron-producing, 50-cm-long Z pinches formed from plasma accelerated through coaxial electrodes. The Z pinches are sustained between a nose cone at the tip …
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Desktop systems for manufacturing carbon nanotube films by chemical vapor deposition
… reaction parameters such as temperature and flow profiles and limit the rate of temperature change during the growth process.
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Ferrohydrodynamic flows in uniform and non-uniform rotating magnetic fields
… measurements of ferrofluid torque and spin-up flow profiles. To characterize the water-based and oil-based ferrofluids used in the experiments, measurements were made of the mass density, surface tension, viscosity, magnetization curve, nanoparticle size, and the speed of sound. Initial …
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Comparison of charge-exchange recombination spectroscopy measurements of the pedestal region of Alcator C-Mod with neoclassical flow predictions
… simplified neoclassical predictions for impurity flows using equations developed for plasmas with background ions in the Pfirsch-Schliter (PS, high collisionality) and banana (low collisionality) regimes. Measured B5+ flow profiles are derived from the charge-exchange spectroscopy diagnostic on …
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Comparative Evaluation of Vorticity Transport Modeled Distortions and High-Fidelity ANSYS Solutions Using Modal Assurance Criterion
… Ansys CFX simulation for three canonical swirl flow profiles: Bulk Swirl, Twin Swirl, and Quad Swirl. Modal decomposition through singular value decomposition (SVD) is performed on the resulting in-plane velocity profiles for both the ROM and high-fidelity RANS simulations. The accuracy of the …
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Learning hydrodynamic coefficient databases for vortex induced vibration prediction of marine risers using sparse sensor measurements
… is applied to a straight riser in uniform flow and extended to non-straight riser configurations and non-uniform incoming flow profiles. Moreover, database inference is extended to using direct sparse sensor measurements along the structure. Specifically, a 19-dimensional parametric …
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