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 34 for “"flow development"”.
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Mist to annular flow development quantified by novel video analysis methods
… of the film and droplets found in annular-mist flows to be extracted from a single video. This method allows measurements to be made without altering the internal geometry or flow path. Flow parameters such as drop size, velocity, and concentration and film wavelength and wave speed are each …
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A study on flow development in an APU-style inlet and its effect on centrifugal compressor performance
… of this research were to investigate the flow development inside an APU-style inlet and its effect on centrifugal compressor performance. The motivation arises from the increased applications of gas turbine engines installed with APU-style inlets such as unmanned aerial vehicles, auxiliary …
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Developing Adiabatic Two-Phase Flow
… understand the characteristics of the adiabatic development of two-phase flow this study was performed using H2FC-CF 3 - 1,1,1,2-Tetrafluoroethane (R134A) as a working fluid in three different transparent tubes. The flow was visualized using a high speed camera. To better (faster and more …
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Wall-Jet Turbulence and Mixing Control by Way of a Pulsed Inlet Velocity
… enhancement are attainable by modifying the flow development. Simulations are performed to investigate the effect on skin friction and flow mixing due to introducing controlled perturbations, at the initial shear layer of a planar wall-jet using jet inlet cyclic pulsing. The billow production …
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A computational study of the 3D flow and performance of a vaned radial diffuser
… diffuser using the MEFP (The Moore Elliptic Flow Program) flow code. The vaned diffuser studied by Dalbert et al. was chosen as a test case for this thesis. The geometry and inlet conditions were established from this study. The performance of the computational diffuser was compared to the …
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A Comprehensive Numerical Investigation of Heat Transfer Dynamics in Supercritical Carbon Dioxide Cooling
… numerical validation and avoids hydraulic flow development inaccuracies. Additionally, the thermal entrance length, influenced by the inlet temperature relative to the pseudocritical temperature, is crucial for optimizing heat exchanger performance with sCO<sub>2</sub>.</p>
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Effect of diameter ratios on the flow-sound interaction of the straight circular finned cylinders
… in heat exchangers could be susceptible to the flow-excited acoustic resonance that generates intense pressure fluctuations, which may lead to premature fatigue failure of the tubes. This thesis explores the unsteady flow development around circular finned tubes and its role in the excitation of …
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Multi-scale Analysis of Methane Gas Hydrate Formation and Dissociation via Point Source Thermal Stimulation and Carbon Dioxide Exchange
… in both the medium and large scale reactors a flow recirculation pattern developed within the pore space following an initially conduction dominated heat transfer regime. The outward propagation of the heat front from the heating element resulted in increased permeability and the release of …
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Experimental Validation of an Ejector Ramjet Solver at High Entrainment Conditions
… solver was performed at various subsonic inlet flow conditions corresponding to high-entrainment ratios. An ejector apparatus was designed to replicate the intake of an ejector-ramjet currently under development. The apparatus was then connected to a vacuum tank with which the desired inlet …
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Convective Flow Patterns of a Three Generation Bifurcation Model
<p>To experimentally study the convective flow patterns of the human lung, a large scale symmetric model was built to model branching airways that air passes through during respiration. The model used in this experiment goes through three symmetrical 70¿¿ bifurcations before terminating at the …
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Tip leakage flow, heat transfer and blade lifing in a jet engine turbine
… code (MEFP) was used to calculate developing flow and heat transfer in turbine tip gaps. Successful calculations of the heat transfer to a model turbine blade tip were obtained with a Prandtl mixing length turbulence model. The calculations revealed details of the flow development including …
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MEAN TURBULENCE STRUCTURE IN STRONGLY HEATED AIR FLOWS.
… temperature fields and wall parameters for air flowing in a smooth, vertical tube at low entry Reynolds numbers are presented for heating with constant wall heat flux along the heated length. Two entry Reynolds numbers of approximately 6000 and 4000 were employed with three heating rates, q('+) …
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A wind tunnel facility for the evaluation of a land-based gas turbine diffuser-collector
… tested as part of a base line test investigating flow within a diffuser-collector. Facility controls allowed the quarter scale model to match both Reynolds number and Mach number. Mass averaged conditions at the diffuser inlet during testing were determined as 1.939 ? 106 for Reynolds number based …
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Aerodynamics of Endwall Contouring with Discrete Holes and an Upstream Purge Slot Under Transonic Conditions with and without Blowing
… aerodynamic performance by reducing secondary flow strength. The effects of endwall contouring with discrete holes and an upstream purge slot for a high turning (127") airfoil passage under transonic conditions are investigated. The total pressure loss and secondary flow field were measured for …
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Hemodynamic Flow Characterization of St. Jude Medical Bileaflet Mechanical and Bioprosthetic Heart Valve Prostheses in a Left Ventricular Model via Digital Particle Image Velocimetry
… replacement operation will greatly depend on the flow character downstream the mitral valve thus a better understanding of the flow character is essential. Most in vitro studies of the flow downstream of a MHV have been conducted with the valve in the aortic position. Researchers reported detailed …
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3-D flow and performance of a tandem-bladed rocket pump inducer
… presents the results of a three-dimensional flow calculation with a model of turbulent viscosity for a tandem-bladed inducer in air. The purpose is to understand the 3D flow development through the two blade rows and to compare the results of the calculation 'with experimental data. A …
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CFD modelling of pipe erosion under multiphase flow regimes.
… efficiency of pipe-lines and other related flow systems. Proper knowledge of the flow characteristics, particle behaviour and geometric effects is very important in the accurate prediction of erosion rates and location. This study focuses on predicting erosion under complex multiphase flow …
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Flows through s-shaped annular, inter-turbine diffusers
… diffusers or swan neck ducts (SND's) provide flow continuity between the H.P. and L.P. turbine, which with diffusing of the flow allow; greater stage efficiencies to be achieved as a consequence of reducing both the stage loading and flow coefficient of the L.P. turbine. This thesis presents …
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Developing and Testing a Combustor Simulator For Investigating High Pressure Turbine Aerodynamics and Heat Transfer
… Mach number, pressure ratio, corrected mass flow, gas to metal temperature ratio, and corrected speed. The primary research objective was to design, install, and verify a non-reacting simulator device that can provide representative combustor exit total pressure and temperature profiles to …
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Mean Flow Characteristics and Turbulent Structures of Turbulent Boundary Layers in Varying Pressure Gradients and Reynolds Numbers
Turbulent boundary layers flowing over a smooth surface were studied to understand the influence of varying pressure gradients and flow Reynolds number on the boundary layer growth and mean turbulent properties. The test was conducted in the Virginia Tech Stability Wind Tunnel with a 0.914 m chord …
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