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 26 for “"Depressurization"”.
-
Design and automated operation of a condensation-induced depressurization system
… based on the idea of the condensation-induced depressurization with prefilled condensable medium in a confined, adiabatic chamber. The operation process of this new system includes mainly four phases, steam filling phase, cooling phase, usage phase and transition phase, operating sequentially. …
-
Aerosol transport by coughing in a depressurized and air-conditioned chamber
… of such a CFD simulation by experiment; 5) the depressurization of the air-conditioned chamber and 6) the mechanistic study of droplet evaporation. Accordingly, this work provides the following to study the aerosol transmission in a depressurized chamber: a transient repeatable bimodal cough …
-
Formation of Cyclodextrin-Drug Inclusion Compounds and Polymeric Drug Delivery Systems using Supercritical Carbon Dioxide
… the formation of a non-porous outer skin upon depressurization and limited pore interconnectivity. Approaches to circumvent these limitations include the use of a co-solvent and controlling depressurization rates. The effect of processing parameters, including foaming temperatures and …
-
A study on single blower door methods for multifamily buildings in Montreal
… of detached houses, where whole building depressurization can be achieved with one blower door. However, testing of multifamily buildings is less common, partly because several blower doors are required to depressurize the entire building. This approach is deemed too costly and impractical …
-
Laboratory simulation of subsurface airflow beneath a building
… a function of above ground wind speed, while the Depressurization Experiment examines the flow rate of air into a model building as a function of decreased building pressure. For the Wind Experiment, tests were run for basement and slab-on-grade building configurations, as well as with and without …
-
Understanding the effect of intermittent water supply on drinking water quality
… operations allow for periods of stagnation and depressurization that create conditions favorable for biofilm growth on pipe surface. Biofilms are complex microbial communities that are likely sources of opportunistic waterborne pathogens and can cause disease outbreaks. Flushing of the water …
-
Reactor physics design of supercritical CO₂-cooled fast reactors
… low coolant void worth (+22 cents upon complete depressurization of S-CO₂ coolant) and tolerable reactivity- limited burnup at matrix volume fractions of 60% or less in a 600 MWth core having H/D of 0.85 and titanium reflectors. Pin-type cores were also evaluated and demonstrated higher kff …
-
The flow structure under mixed convection in a uniformly heated vertical pipe
… reactor (HTGR), the decay heat removal (DHR) in depressurization accidents is a major challenge to be overcome. This is due to (1) a gas has inherently inferior heat transport capabilities compared to a liquid and (2) the high surface heat flux of the GFR strongly affects the gas flow under …
-
Effects of a Slow Gas-Phase Reaction on the L(*) Instability in Solid-Propellant Rockets
… of the known extinction phenomena under high depressurization are captured. On the other hand, the unsteady process at the subsurface is pointed out as a possible cause for the chuffing.
-
Preparation of highly reflective films by supercritical infusion of a silver additive into poly(ether ether ketone)
… the additive under pressure for a brief time, 2) depressurization of the system caused the CO2 to rapidly diffuse out of the polymer; while the remaining additive in the polymer desorbed at a much slower rate governed by its diffusivity in the CO2-free polymer. Following this process the infused …
-
The Manufacture of Polymer Nanocomposite Materials Using Supercritical Carbon Dioxide
… and expanding the clay-CO₂ mixture via rapid depressurization into a two-stage screw extruder to mix with the polymer pellets. However, composites with clay loading higher than 6.6 wt % were not reported. In addition, the scCO₂ aided processing method has not been applied to carbon nanotube …
-
Precipitation of ultrafine particles using liquid antisolvent with concentric ultrasonic nozzle and subcritical CO2
… mixing and to increase the nucleation rate. The depressurization of CO_2 expanded solutions of Griseofulvin, causes large temperature drop and hence induce low supersaturation an high nucleation rate. This results in precipitation of ultrafine particles. Particles in the range of 15 - 1 um have …
-
Mixing of nanoparticles in a stirred tank in high pressure carbon dioxide
… and mixing of nanoparticles is based on rapid depressurization/expansion of supercritical suspensions. where the suspension of initially premixed agglomerates in supercritical CO_2 pass through the nozzle undergoing deagglomeration as a result of rapid expansion of CO_2 and subsequently passing …
-
Incorporation of Corrosion Mechanisms into a State-dependent Probabilistic Risk Assessment
… by stress corrosion cracking rupture due to depressurization following a steam line break resulting from flow-accelerated corrosion. This study was performed by developing a state-dependent risk model. The model has the capability of using traditional PRA tools such as event trees and fault …
-
Optomechanical design, analysis, and testing of the nanosatellite optical downlink experiment
… 200 for shear, tensile, and separation analysis. Depressurization analysis is performed to calculate expected payload pressure loads and optical bond analysis is performed and predicts a margin of safety of 5 for adhesive optical bonds in a worst-case scenario. Thermal analysis predicts the NODE …
-
Mineral deposition in epithermal deposits formed through flash vaporization and implications for improved understanding of the Arista intermediate-sulfidation epithermal deposit in southern Mexico
… may have been important in triggering rapid depressurization along the controlling structures, leading to repeated flash vaporization of the hydrothermal liquids and the formation of high-grade mineralization.
-
Investigation of pressure-tube and calandria-tube deformation following a single channel blockage event in ACR-700
… plastic strains. Failure of the PT/CT results in depressurization of the primary system, which triggers a reactor scram, after which the decay heat is removed via reflooding, thus PT/CT rupture effectively terminates the accident. Clearly, prediction of the time scale and conditions under which …
-
Improving Off-line and On-line Supercritical Fluid Extraction Techniques by Elevating the Post-Restrictor Pressure
… as the fact that the fluid becomes gaseous upon depressurization and that supercritical fluids generally extract less contaminant material. In this thesis we have shown that, by elevating the post-restrictor pressure, the decompressed flow rate can be reduced, and these problems can be minimized, …
-
Impact of Hydrate Dissociation on the Stiffness and Strength of Hydrate Bearing Sands
… of both mechanical properties compared to depressurization for the same degree of hydrate dissociation. The study also elucidates the distinct mechanisms governing the mechanical response of HBS during dissociation, highlighting the critical changes in hydrate morphology as thermal …
-
Optimization of Coalbed Methane Completion Strategies, Selection Criteria and Production Prediction: A Case Study in China's Qinshui Basin
… wells offer the benefits of faster reservoir depressurization, high gas production rates, and faster recovery times than traditional vertical fracture wells. Coupled with reservoir modeling results, discounted cash flow analyses show that high drilling density multilateral horizontal patterns …
Page 1 of 2