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 46 for “"flow profile"”.
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Development of Specialized Laser Doppler Velocimeters for High Resolution Flow Profile and Turbulence Spectral Measurements
… are always in need of innovative instruments for flow velocity measurements. An ideal instrument would be non-intrusive, have a very fine spatial resolution as well as a very fine temporal resolution, be able to measure three-components of velocity, and be compact. Through recent advancements, …
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Investigation of Melt Electrical Conductance in Food Extrusion
… The specific feeding load, barrel fill and flow profile were affected by the feed rate and the screw speed in opposite directions. Spread of the normalized RTD decreased with increasing feed rate while increasing screw speed broadened RTD due to more mixing. The flow profile in the extruder …
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Implementation of a non-linear eddy viscosity turbulence model into Hydra-TH for fuel related applications
… that allows it to capture the anisotropy of flow conditions. Modeling this behavior is essential for the accurate simulation and prediction of the flow profile in fuel rod arrays, where secondary flow vortices arise and act to modify the flow profile. The quadratic model formulation in the …
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Nondimensional approach to the design of open channels with spatially varied flow
… equation is developed which describes the flow profile in rectangular channels with spatially varied flow. This equation is solved for various slopes and rates of discharge. The results show that when the slope and roughness are constant the dimensionless profiles are also constant over 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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Asymmetric flow measurement in space constrained cooling water ducts using a traversing probe
… research was to identity and recommend a type of flow measurement technique suitable for flow measurements in the CW ducts. After conducting a literature survey, the author restricted research to a local flow measuring technique as a result of physical constraints on site. In addition, the flow …
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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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Measurement of total hydrocarbon emissions with MEMS using a portable FID and a novel exhaust flow meter
… hydrocarbon analyzer and McCrometer's V-Cone flow meter. The Signal Model 3030PM analyzer uses a heated flame ionizing detection scheme to measure hydrocarbons. The V-Cone is an obstructive, differential pressure flow meter that reshapes the flow profile, therefore conditioning the flow.;The …
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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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Modelling of physical and chemical processes in the small intestine
… which enabled investigation into the fluid flow, mixing mechanisms and delivery of nutrients to the wall of the model small intestine. Designing, developing and using the Small Intestinal Model (SIM), a physical model of a section of the small intestine, mimicking the physiological …
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Numerical modelling of the Oldroyd-B fluid
… developed is verified by using the symmetric “flow over a cylinder” benchmark problem. The effect of using piecewise-constant discontinuous and bilinear discontinuous elements for the extra stress field is investigated. The the results of the scheme are compared to those found in literature. …
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Alternating Current Electroosmotic Micropumping Using A Square Spiral Microelectrode Array
… wave of potential and resulted in a net fluid flow across the microelectrode array. Microsphere tracer particles were suspended in ethanol to measure the fluid velocity to determine pumping performance and the experimental operating frequency at which maximum fluid velocity is achieved. The …
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A fully implantable intracochlear drug delivery device : development and characterization
… variables to their electrical analogues. A flow module described the output of the microfluidic system and used storage and loss elements to represent cochlear anatomy contributing to the flow profile. In the other portion of the model, a transport module solved for the drug concentration …
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Numerical Modeling of Synthetic Vortical Disturbance Interactions Using OpenFOAM
… by the vertiport’s highly unsteady, turbulent flow environment. The goal of this study is to model the turbulent wind interaction with a building to understand the unsteady flow characteristics around vertiports and match the induced unsteady disturbance field to the canonical disturbance …
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Hydrodynamic and Mass Transport Properties of Microfluidic Geometries
… approaching the Stokesian limit, where the flow profile is laminar, viscous forces are dominant and inertial forces are negligible. This work presents results on two transport problems in microfluidic geometries. The first examines the heterogeneous binding kinetics in a microbead array, …
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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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Factors Affecting Redox Magnetohydrodynamics for Flow in Small Volumes
… high voltage requirements, disadvantageous flow profiles or rates, and relatively complicated fabrication due to mechanical parts. Redox magnetohydrodyanmics (RMHD) that utilizes permanent magnets for portability shows promise as a micropump with ease of switching flow direction, no moving …
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Vortex-induced vibration of slender structures in unsteady flow
… oscillate, creating an unsteady and nonuniform flow profile along the riser. The purpose of this research is to develop a VIV prediction model for slender structures under top-end periodic motions. The key approach to this problem requires identifying the dimensionless parameters important to …
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Vortex-induced motions of marine risers : straked force database extraction & transient response analysis
… of the riser response under a particular flow profile. The nominal databases are then altered in a systematic way until the new VIVA predicted response best matches the measured field response, thus resulting in optimal databases. In part II of the thesis, we show using experimental data …
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Stochastic and deterministic models for dense granular flow
… two models are developed for dense granular flow, each capable of predicting flows with accuracy in multiple environments. The models are based on differing perspectives of grain-level dynamics, with one deriving flow from a stochastic mechanism and the other from a deterministic deformation …
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