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 23 for “"SCW"”.
-
Assessment of FLUENT CFD code as an analysis tool for SCW applications
… concepts, SuperCritical Water-cooled Reactors (SCWRs) are expected to have high thermal efficiencies within the range of 45 ‒ 50% owing to the reactor‟s high pressures and outlet temperatures. The behaviour of supercritical water however, is not well understood and most of the methods available …
-
Heat-transfer analysis of double-pipe heat exchangers for indirect-cycle SCW NPP
SuperCritical-Water-cooled Reactors (SCWRs) are being developed as one of the Generation-IV nuclear-reactor concepts. SuperCritical Water (SCW) Nuclear Power Plants (NPPs) are expected to have much higher operating parameters compared to current NPPs, i.e., pressure of about 25 MPa and outlet …
-
Supercritical Water desulfurization of crude oil
Supercritical Water (SCW) desulfurization was investigated for both model sulfur compounds and Arab Heavy crude. In part 1, the reactions of alkyl sulfides in SCW were studied. During hexyl sulfide decomposition in SCW, pentane and CO+CO₂ were detected in addition to the expected six-carbon …
-
Study on linking a SuperCritical water-cooled nuclear reactor to a hydrogen production facility
The SuperCritical Water-cooled nuclear Reactor (SCWR) is one of six Generation-IV nuclear-reactor concepts currently being designed. It will operate at pressures of 25 MPa and temperatures up to 625°C. These operating conditions make a SuperCritical Water (SCW) Nuclear Power Plant (NPP) suitable to …
-
Global Structure of the Nightside Proton Precipitation during Substorms using Simulations and Observations
… region forming the substorm current wedge (SCW). As the substorm continues, the SCW typically grows azimuthally and radially as the result of the continued flux pileup. Using the OpenGGCM global MHD simulation, we show that the proton precipitation can be split azimuthally due to the …
-
Multi-scale modeling tools for coupled reaction, phase equilibrium and two-phase mixing phenomena with application to supercritical water heavy oil upgrading process
… reaction in the presence of supercritical water (SCW). While these studies indicate that the presence of SCW can significantly affect the outcomes of the upgrading process, there remains a lack of clarity on whether thermolytic processing in the presence of SCW is indeed significantly beneficial …
-
CFD determination of fluid and geometry related localized heat transfer phenomena for supercritical water flow
… concept of Supercritical Water-cooled Reactor (SCWR) as part of the Generation IV International Forum aims to improve the thermal efficiency over current power plants by utilizing cooling water at pressures and temperature above the critical point. At supercritical conditions, however, the …
-
Metallorganische Katalyse in überkritischem Wasser
… zum Synthesepotential von überkritischem Wasser (SCW, p > 250 bar, T > 374 °C) bei metallorganischen Reaktionen durchgeführt. Besonderer Wert wird dabei auf bisher wenig bis gar nicht beachtete Eigenschaften des überkritischen Wassers (z.B.: hohe Raum-Zeit-Ausbeuten oder sein ausgezeichnetes …
-
Molecular dynamics and self-diffusion in supercritical water
Supercritical water (SCW) which exists beyond the critical point (Tc=647.2K, Pc=221bar) is an innovative solvent to dissolve organic material. Many applications of this new solvent such as oxidation of organic wastes and separation of metals have been researched; however, the properties of SCW have …
-
Predicting organosulfur chemistry in fuel sources
… of fossil fuels with supercritical water (SCW) has been the topic of many studies over the past few decades. This process does not require the use of any catalyst, eliminates the need for a hydrogen feed, and minimizes coke formation. Previous research has shown that it has the potential to …
-
Co-oxidation in supercritical water : methylphosphonic acid-ethanol and ammonia-ethanol model systems
Supercritical water (SCW) is an effective solvent for the destruction of organic compounds by oxidation. Because both organics and oxygen have high solubility in water above its critical point (To = 374 °C (647 K), Pc = 221 bar), they can be reacted together in a single phase which avoids mass …
-
Processing and Characterization of Silicon-Carbide Whisker/alumina Matrix Composites
… Silar SC-9 whiskers from Arco Metals Co. and SCW # 1-S whiskers from Tateho Chemical Industries Co. Ltd.
-
Kinetik der CpCo-katalysierten Cyclotrimerisierung von Phenylacetylen in überkritischen Fluiden
… (scCO2) oder auch überkritischem Wasser (SCW) bildete den Schwerpunkt in vorliegender Arbeit. Die Messungen dazu wurden in einem 30 ml Fensterreaktor mit manuellem Probenahmesystem durchgeführt. Die erhaltenen Proben wurden via off-line GC analysiert. Da derzeit keine Daten zur Löslichkeit …
-
Study of heat transfer in a 7-element bundle cooled with the upward flow of supercritical Freon-12
Experimental data on SuperCritical-Water (SCW) cooled bundles are very limited. Major problems with performing such experiments are: 1) small number of operating SCW experimental setups and 2) difficulties in testing and experimental costs at very high pressures, temperatures and heat fluxes. …
-
Influence of Overall Habitual Physical Activity on the Age-Related Change in Muscle Mass in 60 to 85 Year-Olds
… work. Higher levels of stair climbing at work (SCW) and running during leisure (RDL) were associated with a smaller age-related loss in ASM mass, even when accounting for age, time of follow-up and gender. Leg muscle mass was positively associated with CEPFP, even when accounting for age and …
-
Specifics of forced-convection heat transfer to supercritical water flowing upward in annular and bundle flow geometries
… geometries cooled with upward flow of SCW. The bare tube correlation proposed by Jackson (2002) [3] predicted heat transfer within experimental uncertainties for most trials and, to some extent, followed wall temperature trends in regions of Deteriorated Heat Transfer (DHT). However, it …
-
A fundamental study of model fuel conversion reactions in sub and supercritical water
… reformation of methane in supercritical water (SCW) was completed that explored the use of carefully chosen catalysts under a variety of conditions and measured the conversion of methane and yields of various products.
-
Design characterisation and in planta expression of a chimeric xylanase
… was associated with the secondary cell wall (SCW) in transgenic plants, indicating that the CBM22 domains retained function. Finally, transgenic plant lines showed increased recalcitrance to enzymic digestion, possibly through Xyl22L adhering to the SCW and preventing access of hydrolytic …
-
Thermodynamic and transport property modeling in super critical water
Supercritical water oxidation (SCWO) is a thermally-based, remediation and waste-treatment process that relies on unique property changes of water when water is heated and pressurized above its critical point. Above its critical point (374.1 ⁰C and 220.9 bar), water becomes gas-like and somewhat …
-
The effects of acute aerobic exercise on cardiovascular reactivity in response to psychological stress in trained cyclists
… the Cold Pressor (CP) or Stroop Color Word (SCW) tasks. All subjects participated in exercise and control sessions. The exercise session consisted of 30 minutes at 70% VO₂ max and the control session involved several health assessments with no exercise. There was no significant difference in …
Page 1 of 2