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 22 for “"saturation pressure"”.
-
Experimental and Numerical Study of Dual-Chamber Thermosyphon
… were carried out using water at sub-atmospheric pressures of 9.7, 15 and 21 kPa with a three-dimensional porous boiling enhancement structure integrated in the evaporator. Sub-atmospheric pressure boiling achieved heat fluxes in excess of 100 W/cm2 with negligible incipience superheat, for wall …
-
The Phase Behavior of Heavy Oil and Propane Mixtures
… from temperatures between 20 and 180°C and pressures up to 10 MPa. Both vapor-liquid (VL) and liquid-liquid (LL) regions were observed. High pressure micrographs demonstrated that the heavy phase (a pitch phase) transitioned from a glass to a liquid state with increased temperature and feed …
-
A Novel Process to Create Arbitrary Microcellular Patterns in Polycarbonate using a Laser Beam
… that were saturated with carbon dioxide at pressures of 1, 3 and 5 MPa. The relationship between the processing (input) factors of speed, power (of the laser beam), and the saturation pressure and the consequent microstructure produced (parameters like average cell size, foam depth, and …
-
Convective boiling of refrigerants near the micro-macroscale transition inside plate heat exchangers
… and its impact on evaporative heat transfer and pressure drop during plate heat exchanger (PHE) operation at low mass flux conditions. While there is interest in this operating regime in the heating, ventilating, air conditioning, and refrigeration industries, especially for part-load conditions, …
-
Strategies to Enhance Performance of Solar Driven Desalination
… the nearly exponential dependence of water vapor saturation pressure on temperature, and therefore on incident light intensity. We also demonstrate that the energy used for phase change in distillation can be recovered from the distilled water to preheat the input water and matching the feed and …
-
Thermodynamic Investigation of the Interaction between Polymer and Gases
… in polymer melts under elevated temperature and pressure. The proposed theoretical approach based on the thermodynamic model of SS-EOS is applied to understand the interaction of blowing agents with the polymer melt and one another (in the case of blend blowing agent). An in-depth study of the …
-
Multiphase flow and mass transport through porous media
… flow for air and water. In this model, the saturation-pressure-conductivity relations are used to obtain the constitutive behavior. The solution procedure of the resulting time dependent nonlinear equation involves using a general 0-scheme, for time integration, and a modified Picard's …
-
Rolling Contact Wear of Hybrid Ceramic Bearings with Refrigerant Lubrication.
… mechanical applications is difficult due to high saturation pressure of the refrigerants. It is important to investigate the influence of these refrigerants as lubricants on the rolling contact fatigue performance of ceramic bearing elements. This research responds to the need for bench testing of …
-
Investigation of in-nozzle flow characteristics of fuel injectors of IC engines
… by the on-going trend towards higher injection pressures, which enhances fuel evaporation but also creates undesirable consequences due to transient nature of cavitation such as spray instabilities, erosion on internal surfaces, and hydraulic flip. Thus, the understanding of the internal flow of …
-
Measurement and Modeling of Pentane-Diluted Bitumen Phase Behaviour
… state (CEoS). While CEoS have successfully fit saturation pressures and asphaltene onset points for bitumen-solvent systems using simple quadratic mixing rules; they do not accurately predict asphaltene precipitation yields. This thesis focuses on data collection and CEoS modeling with …
-
A semi-empirical approach to modelling well deliverability in gas condensate reservoirs.
… for fluid property prediction below the saturation pressure was a major consideration to properly allow for retrograde condensation, complications of multiphase flow and mobility issues. Previous works are limited to use of experimentally measured pressure, volume, temperature (PVT) …
-
Combined effect of electric field and surface modification on pool boiling of R-123
… on saturated pool boiling of R-123 at 1.01 bar pressure was also examined. This method of heat transfer enhancement is known as electrohydrodynamic abbreviated as EHD-enhancement. A high voltage potential was applied at the electrode located above the heating surface, which was earthed. The …
-
Phase equilibria and volumetric properties for the system NaCl-CaCl₂-H₂O
… were determined under 1 atm. total pressure along the NaCl-H₂O and CaCl₂-H₂O binaries and along five pseudobinaries with constant NaCl/(NaCl+CaCl₂) weight ratios. The results are in excellent agreement with published data along the NaCl-H₂O binary but show large discrepancies when …
-
A study into the effects of spray and jet characteristics on flash evaporation system
… is injected into the vacuum area, where the pressure is far below the saturated pressure of the liquid entering the area. This approach of flash evaporation is a key part of this type of system. It has a great potential to develop and improve the implementation of low thermal desalination …
-
Achievable power uprates in pressurized water reactors using uranium nitride fuel
… uprate. The steady state limits considered are pressure drop, minimum departure from nucleate boiling ratio, fretting and sliding wear and fuel average and centerline temperatures. These limits were set by the reference design's performance. Two strategies were used to raise the core power while …
-
Utilization of Carbonated Water Injection (CWI) as a Means of Improved Oil Recovery in Light Oil Systems: Pore-Scale Mechanisms and Recovery Evaluation
… observed for both water and oil phases when the pressure increases in the range of P = 0.7–10.3 MPa. Furthermore, it was found that the solubility of CO2 reduces with increased temperature. In addition, the results obtained from swelling/extraction tests revealed that the oil swelling factor …
-
Modeling CO₂ leakage from geological storage formation and reducing the associated risk
… pathway in wells that exhibit sustained casing pressure (SCP) and the rate-limiting part of the leakage pathway in any wellbore that CO₂ might encounter. By using field observations of SCP to estimate transport properties of a CO₂ leakage pathway, we obtain a range of CO₂ fluxes for the cases of …
-
Optimum Timing for CO2-EOR After Waterflooding and Soaking Effect on Miscible CO2 Flooding in a Tight Sandstone Formation,
… in a tight sandstone formation. First, the saturation pressure (Psat), oil-swelling factor (SF), gas–oil ratio (GOR) of CO2- saturated light oil, and gas–water ratio (GWR) of CO2-saturated reservoir brine were measured by using a PVT system. Second, the viscosities of CO2-saturated light oil …
-
Vortex control of two-phase refrigerant flow in nozzles and its application in ejector vapor compression cycles
… behind the vortex control effect, static pressure profiles of vortex flashing R134a flow expanded through nozzles under various conditions have been measured. A 1D model for the estimation of vapor qualities in the initially subcooled flashing nozzle flow based on the measurement results …
-
CONTACT PRESSURE MEASUREMENT
… techniques do not indicate the actual gasket pressure in the interfaces of the joint. An extensive literature survey was carried out to identify suitable sensing material that could be configured into a miniature sensor to be inserted between the two interfaces of bolted joints for the purpose …
Page 1 of 2