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.
Results
Showing 1 to 20 of 44 for “"steady-state flow"”.
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Steady-state flow induced forces in a hydraulic jet-pipe valve
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1961.
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An investigation of discharge coefficients and steady state flow forces for poppet type valves
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1957.
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Extending the annular in-plane torsional shear test specimen to applications at high strain rates
… in the future. An estimation method for steady-state flow stress is presented with the steady-state flow stress found to be rate dependant. Finally, a relationship between the steady-state flow stress and strain rate for all experimental results is proposed.
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Separated Flows Over Non-slender Delta Wings
… sound. This thesis examines experimentally the flow separation over low-sweep angle or 'non-slender' delta wings, specifically focusing on the coherent vortices characteristic of such geometries. First, stereo particle image velocimetry and surface pressure are used to reconstruct the flow the …
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Applications and numerical investigation of differential-algebraic equations
… prob- lems, energy-economic models and traffic flow models. An energy-economic model is presented based on the Hubbert model of oil production and is extended to include economic factors for the first time. Using numerical methods to simulate the DAE model, the resulting graphs break the …
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Transonic aerodynamics of dense gases
Transonic flow of dense gases for two-dimensional, steady state, flow over a NACA 0012 airfoil was predicted analytically. The computer code used to model the dense gas behavior was a modified version of Jameson's FLOS2 airfoil code. The modifications to the code enabled modeling the dense gas …
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MOVING WALL JET FLOW NEAR CHANNEL EXIT AT MODERATE REYNOLDS NUMBER
The two-dimensional jet flow of a Newtonian fluid at moderate Reynolds number, emerging from a channel and flowing along one moving plate, while the other plate is stationary, is examined theoretically in this study. In this case, the equations of motion are reduced by expanding the flow field …
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Building a Better Pedestrian Flow Model for the Indianapolis Motor Speedway
… since the terrorist attacks on the United States on September 11, 2001. Increased security requirements are a product of the paradigm shift in security for Mega-Event locations. This study examined the Indianapolis Motor Speedway during Mega-Event status events, with specific focus on the …
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Observing flow using fast neutron radiography and positron emission particle tracking
Dynamic flow of material has been studied using fast neutron radiography (FNR) and positron emission particle tracking (PEPT). A new fast neutron imaging system was commissioned at The South African Nuclear Energy Corporation, Pretoria, as part of this study, although FNR measurements were …
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Microfluidic flow-focusing device for the electrospinning of hollow polymer nanofibers
… with diameters on the order of 100-240 nm, at steady-state flow rates around 50 pL/min. TEM images show hollow interiors with diameters approximately one third of the total fiber diameter. These results are important for future efforts at multiplexing the electrospinning process, and prove that …
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Mechanisms of plastic deformation in amorphous silicon by atomistic simulation using the Stillinger-Weber potential
… with higher [phi] are more amenable to plastic flow, indicating that liquidlike atomic environments act as plasticity "carriers" in a-Si. When deformed under constant pressure, all a-Si samples converge to a unique value of [phi] characteristic of steady state flow. Discrete stress relaxations …
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Calculation of wave resistance and elevation of arbitrarily shaped bodies using the boundary integral element method
… method has been developed for computing the steady state flow about arbitrary shaped three dimensional bodies on or below the free surface using a Boundary Integral Element Method ( Panel Method). The method uses a singularity distribution over the body surface and the free surface. The …
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Design and flow characterization of an indraft supersonic wind tunnel for scramjet testing
This thesis describes the Colorado State University supersonic wind tunnel design, manufacture, assembly, and validation. The overarching goal of this research is to develop a ground testing platform for studying airbreathing hypersonic propulsion systems. Problems of interest include design of …
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Ionic mobility and superplasticity in ceramics
… dependences of any observed superplasticity. Steady-state flow stress values were utilized to calculate the strain-rate sensitivity, m, of the materials, as well as the activation energies (Q<sub>C</sub>) of superplasticity. Next, the obtained values of Q<sub>C</sub>. were compared to SIC …
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Void fraction measurements in large (0.3 m) diameter bubble column using Wire Mesh Sensor and Pressure transducers- Effect of sparger
… and spatial measurements of the two-phase flow parameters in bubble columns is very well known. The aim of this research work is to report the spatial measurements of the void fraction distribution in a 30 cm diameter cylindrical bubble column using Wire Mesh Sensor (WMS) tomography and …
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Void fraction measurements in a large (0.3 m) diameter bubble column using Wire Mesh Sensors and Pressure Transducers: Effect of Spargers
… and spatial measurements of the two-phase flow parameters in bubble columns is very well known. The aim of this research work is to report the spatial measurements of the void fraction distribution in a 30 cm diameter cylindrical bubble column using Wire Mesh Sensor (WMS) tomography and …
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A subsurface water quality evaluation system for assessing NPS pollution potential by pesticides
… of the finite element mesh. Either transient or steady state flow and transport simulation could be performed with the system. The system is able quantitatively to produce detailed spatial variation maps of pesticide concentrations at any desired depth in the unsaturated zone and in groundwater. …
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A TEST METHODOLOGY FOR MEASURING GASEOUS CONTAMINANT TRANSFER IN ENERGY WHEELS
… wheels conserved mass and energy, provided steady state flow parameters and satisfied ASHRAE Standard 84 (2020) requirements. Experimental data showed that EATR consistently decreased with increasing air flow rate and did not change significantly with changes in outdoor air temperature. The …
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On relative permeability : a new approach to two-phase fluid flow in porous media
Being valid for single-phase flow, Darcy's law is adapted to two-phase flow through the standard approach of relative permeability, in which permeability, rather than being a unique property of the porous medium, becomes a joint property of the porous medium and each fluid phase. The goal of this …
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Rheological aspects of sickle cell anemia and related hemoglobinopathies
… as the hematocrit at which the erythrocyte flow rate is the greatest. It therefore represents the optimum oxygen carrying capacity of blood. Using a Weissenberg Rheogoniometer with cone-andplate geometry, viscosity measurements at different hematocrits and oxygen tensions were made on …
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