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 13 of 13 for “"Pressure decay"”.
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Development of a hydraulic component leakage detecting system using pressure decay signal
1 PDF file (vii, 48 pages)
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Formwork pressure and rheology of self consolidating concrete
… the mechanisms responsible for formwork pressure drop over time in case of self consolidating concrete (SCC). The fresh state properties of SCC, mortar, and cement paste mixes like workability, static yield stress gain and temperature change over time were evaluated and correlated with …
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A Computer Vision Approach to Stress Determination in Blisters, and a Fatigue-Based Method Framework for Testing Defect Development
… and the only additional required data is the pressure at the time the image was taken. By pressurizing circular blisters, an equi-biaxial, mechanical stress state is induced, simulating membrane stresses experienced during fuel cell operation as humidity levels fluctuate. The analysis …
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On the formation of Friedlander waves in a compressed gas driven shock tube
… location where the wave first forms, peak over-pressure, decay time and impulse. The approach is based on combining the solutions of the two different types of wave interactions that arise in the shock tube after the family of rarefaction waves in the Riemann solution interacts with the closed …
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Dynamic and Static CO2 Mass Transfer Processes in Bulk Heavy Oil and Heavy Oil Saturated Porous Media
… dynamic conditions. This study commenced with pressure decay experiments at static oil condition, where CO2 was brought in contact with two different types of oil samples. It then continued by using a reactor (PARR-4560) to investigate the influence of convection in the bulk heavy oil. …
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Mass Transfer of Alkane Solvents-CO2-Heavy Oil Systems in the Absence and Presence of Porous Media Under Reservoir Conditions
… well as it can be converted for use at different pressures and temperatures. Further, a robust and pragmatic technique has been developed for the first time to implicitly evaluate the concentration-dependency of diffusivity for each component in a binary gas mixture diffusing in heavy oil as a …
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An Experimental Study of CO2 Dissolution into a Heavy Oil Without or With a Porous Medium
… porous medium at different initial pressures and a constant temperature were measured and compared. In addition, the temperature dependence of the CO2 diffusivity in the Colony heavy oil was noted. Three different theoretical diffusion models for determining the diffusivity of a …
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Optimization of warehouse operations and transport risk mitigation for disposable bioreactor bags to support launch of Amgen Singapore Manufacturing
… qualification plans for disposables, a pressure decay method is recommended for more robust testing of bag integrity. In addition, creation of a "library" of defects is recommended to improve visual inspections.
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Gas Shale Permeability and Velocity Measurement at Laboratory Scale
… apparatus and a newly developed transient pressure technique invented by Metwally and Sondergeld, 2011. Measurement results show evidence for strong anisotropy in both velocity and permeability attributes. Nonlinear reduction in permeability and effective porosity with an increase of …
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The thermal conductivity of filler materials and permeability of a cement sealant for deep borehole repositories for high level nuclear waste
… bedrock. Tests of the cement cured under pressure were conducted using a pressure decay method and water as a pore fluid. Data indicate that bulk permeability of this ideal sample is on the order of 0.1[mu[D, which is sufficient to inhibit flow through the bulk material for the immense …
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LABORATORY-SCALE INVESTIGATION OF PERMEABILITY AND FLOW MODELING FOR HIGHLY STRESSED COALBED METHANE RESEROVIRS USING PULSE DECAY METHOD
… gas flow behavior of CBM reservoirs. The pulse-decay method (PDM) of permeability measurement is believed to be better suited for low-permeability rocks. In this study, application of the currently used pulse-decay laboratory permeability measurement techniques for highly stressed coals were …
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An Experimental Study of Carbon Dioxide Dissolution into a Light Crude Oil
… crude oil densities at different equilibrium pressures and the actual reservoir temperature of Tres = 56.0°C. Second, the onset pressure of the initial quick light-hydrocarbons (HCs) extraction was determined by applying the axisymmetric drop shape analysis (ADSA) technique. Third, five …
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Multiphase, Multicomponent Systems: Divalent Ionic Surfactant Phases and Single-Particle Engineering of Protein and Polymer Glasses
… providing the first calculation of the hydration pressure decay length for globular proteins. The distance-dependence of the interaction potential at distances less than 9 Å was found to have a decay length of 1.7 Å, which is consistent with the known decay length of hydration pressure …